LON - USM

£275 Find Cheap Flights from London to Ko Samui

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Ko Samui departing on 14/3. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ko Samui

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Ko Samui.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Ko Samui.
Travellers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 26% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest return fare
£720
Overall average: £1,002
Multiple Airlines
Tue 10/2Thu 26/2
LGW - USM • 3 stops
Cheapest one-way flight
£275
Multiple Airlines
Sat 14/3
STN - USM • 2 stops
Video guide: How to find cheap flights to Ko Samui
Watch video
Watch video
Watch video
Watch video
Top airlines
SWISS
Cheapest • from £721 (return)
EVA Air
Best reviews • 8.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travellers who book at least 4 weeks in advance save around 32% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
May
Cheapest • 13% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Ko Samui!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from London to Ko Samui (LON-USM)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from London to Ko Samui that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from London to Ko Samui

Tue, 10 Feb - Thu, 26 Feb
Multiple Airlines Logo
06:15 - 18:25LGW-USM
29h 10m3 stops
Multiple Airlines Logo
12:25 - 23:55USM-LGW
42h 30m3 stops
£720Multiple Airlines
Find Deal
Thu, 12 Mar - Mon, 16 Mar
SWISS Logo
17:40 - 21:05LCY-USM
20h 25m2 stops
SWISS Logo
16:25 - 17:05USM-LCY
31h 40m2 stops
£721SWISS
Find Deal
Thu, 5 Feb - Fri, 20 Feb
Multiple Airlines Logo
16:30 - 18:50LGW-USM
43h 20m3 stops
Multiple Airlines Logo
08:15 - 23:55USM-LGW
46h 40m3 stops
£726Multiple Airlines
Find Deal
Thu, 22 Jan - Sun, 1 Feb
Multiple Airlines Logo
17:50 - 13:05LHR-USM
36h 15m2 stops
Multiple Airlines Logo
08:55 - 13:00USM-LHR
35h 05m2 stops
£726Multiple Airlines
Find Deal
Fri, 27 Feb - Fri, 13 Mar
Multiple Airlines Logo
10:30 - 16:25LGW-USM
22h 55m2 stops
Multiple Airlines Logo
15:05 - 14:00USM-LGW
29h 55m2 stops
£727Multiple Airlines
Find Deal
Mon, 4 May - Fri, 15 May
Multiple Airlines Logo
11:35 - 15:10LGW-USM
21h 35m2 stops
Multiple Airlines Logo
15:25 - 15:00USM-LGW
29h 35m2 stops
£730Multiple Airlines
Find Deal
Tue, 14 Apr - Tue, 12 May
SWISS Logo
18:35 - 21:10LGW-USM
20h 35m2 stops
SWISS Logo
10:05 - 17:50USM-LGW
37h 45m2 stops
£739SWISS
Find Deal
Fri, 1 May - Wed, 13 May
SWISS Logo
19:20 - 12:45LCY-USM
35h 25m2 stops
SWISS Logo
10:05 - 18:45USM-LCY
38h 40m2 stops
£752SWISS
Find Deal
Sun, 10 May - Wed, 27 May
Etihad Airways Logo
21:45 - 21:35LHR-USM
17h 50m2 stops
Etihad Airways Logo
20:50 - 12:45USM-LHR
21h 55m2 stops
£755Etihad Airways
Find Deal
Mon, 19 Jan - Mon, 2 Feb
Etihad Airways Logo
20:55 - 07:45LHR-USM
27h 50m2 stops
Etihad Airways Logo
13:25 - 06:40USM-LHR
24h 15m2 stops
£757Etihad Airways
Find Deal
Booking Insights

KAYAK's insights & trends for London to Ko Samui flights

Get data-powered insights and trends into flights from London to Ko Samui to help you find the cheapest flights, the best time to fly and much more.

Find cheap flights to Ko Samui
Find cheap flights to Ko Samui

Planning a trip from London to Ko Samui? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

How much is a return flight from London to Ko Samui?

This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from London to Ko Samui departing in February.

What’s the cheapest day of the week to fly from London to Ko Samui?

The average price of all round-trip flights from London to Ko Samui clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Ko Samui on a Wednesday and more expensive on a Sunday. On your return trip to London, you should consider flying back on a Friday, and avoid Mondays for better deals.

What is the cheapest month to fly from London to Ko Samui?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to Ko Samui, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from London to Ko Samui is May, where tickets cost £808 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is £1,195 and £1,115 respectively.

How far in advance should I book a flight from London to Ko Samui?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London to Ko Samui, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from London to Ko Samui, you should book around 4 weeks before departure, which saves you about 32% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Good to know - Cheap tickets from London to Ko Samui

Low seasonOctober
Cheapest flight£275
Best time to beat the crowds (12% less expensive on average)
Most popular time to fly and prices are also 7% lower on average.
Flight from London Stansted Airport to Ko Samui

When to book flights from London to Ko Samui

Are your dates flexible? Find out the best times to travel from London to Ko Samui based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from London to Ko Samui

  • Are some flights on this route more carbon efficient than others?

    Thai Airways is a good airline to choose if you're looking to reduce your carbon footprint on your flight from London to Koh Samui. Typically leaving twice daily, just after noon and in the evening, these flights emit as around 35% less CO2 than a standard one. This is a one-stop route that takes around 14-16 hours. You'll stop at Bangkok Suvarnabhumi Airport (BKK) for about 1 hour to change planes.

  • Do the airports offer limited-mobility assistance?

    All London airports conform to the UK's national accessibility requirements. They are fully wheelchair accessible and also have facilities for travellers with hidden disabilities, like induction loops. Yellow lanyards are available to make it easier for assistance staff to spot you. You can also book personal assistance (at least 48 hours in advance) through your airline or travel agent. Koh Samui Airport is fully wheelchair accessible, with dedicated assistance for people with decreased mobility. Staff are constantly on hand and there's no need to book.

  • Can I hire a car at Koh Samui International Airport?

    About a half dozen of the world's most popular car hire companies have branches at Koh Samui Airport. It's a relatively small airport, so you won't have any trouble spotting these in the Arrivals terminal once you've claimed your luggage and passed through customs. As car stocks are limited, it's wise to book in advance.

  • How do I get from Koh Samui International Airport to the town centre?

    Koh Samui Airport is near the town of Bo Phut, a little way north of the island's main city of Chaweng. If you don't hire a car, your transport options to get to Bo Phut are to catch a taxi or an airport shuttle, both of which take about 10 minutes to make the trip. Getting directly to Chaweng takes roughly the same amount of time using the same transport modes, give or take a couple of minutes.

  • What is the cheapest flight from London to Ko Samui?

    In the last 3 days, the lowest price for a flight from London to Ko Samui was £275 for a one-way ticket and £721 for a return.

  • Which airports will I be using when flying from London to Ko Samui?

    London has 5 major airports: London City, London Gatwick, London Heathrow, London Luton, and London Stansted. Ko Samui is the only airport in Ko Samui. You’ll usually find the cheapest deals if you fly from London City.

  • Which aircraft models fly most regularly from London to Ko Samui?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from London to Ko Samui?

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between London and Ko Samui, with SkyTeam being the most commonly used for this route.

  • What is the most popular stopover when flying to Ko Samui from London?

    Bangkok is the most popular stopover city among KAYAK users travelling from London to Ko Samui.

  • Which is the best airline for flights from London to Ko Samui, EVA Air or Singapore Airlines?

    The two airlines most popular with KAYAK users for flights from London to Ko Samui are EVA Air and Singapore Airlines. With an average price for the route of £851 and an overall rating of 8.4, EVA Air is the most popular choice. Singapore Airlines is also a great choice for the route, with an average price of £921 and an overall rating of 8.1.

  • How does KAYAK find such low prices on flights from London to Ko Samui?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London to Ko Samui.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to Ko Samui?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ko Samui from London is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London to Ko Samui?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Ko Samui with an airline and back to London with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to Ko Samui?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ko Samui from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from London to Ko Samui

  • Koh Samui is a resort island off Thailand's coast. To visit mainland cities like Phuket and Bangkok, you can catch one of the dozens of daily flights on Bangkok Airways or Thai AirAsia.
  • If you're flying to Koh Samui with children, Heathrow (LHR) and Gatwick (LGW) are convenient airports. They have supervised Stay & Play areas and Kids' Zones, where youngsters can amuse themselves while waiting for your flight.
  • EVA Air offers one of the more comfortable economy-class flights from London to Koh Samui. You can enjoy on-demand video, with power and USB outlets built into your seat. You'll generally also be served a meal.
  • Koh Samui Airport (USM) is owned and operated by Bangkok Airways, the main local Thailand air carrier. This allows you to easily and inexpensively catch connecting domestic flights to cities in the rest of the country.
  • Choose your London airport based on where you're coming from. Heathrow is on the western outskirts, with Stansted (STN) quite a way north. Gatwick is about 30 minutes south of London, while London City Airport (LCY) is close to Central London.

Reviews of the top 5 airlines flying from London to Ko Samui

 
See real verified KAYAK customer reviews for airlines flying from London to Ko Samui. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from London to Ko Samui? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.4
EVA AirOverall score based on 1284 reviews
8.3Comfort
8.6Crew
8.0Entertainment
8.4Boarding
8.1Food
Airline reviews

Everything was great, however the seats in the back are very small. Not as Comfortable as I would have liked.

10.0 ExcellentWalter, Nov 2025TPE - BKK
Read more EVA Air reviews

Everything was great, however the seats in the back are very small. Not as Comfortable as I would have liked.

Eva airlines has very goin service, despite being low cost. Meals and fin, not amazing, restrooms always clean and staff polite and helpful

Awful had to ask for a supervisor to sit with my flight companion even t booked the tickets together weeks before

Flight Attendants could have been nicer and food portions could be bigger.

I have never heard of EVA air before but I am so happy my wife and I were able to flight on their planes twice. Everything on these flights just felt better than their competitors. As someone with longer legs any bit of extra leg spaces is appreciated. The different options for food and drinks were also a plus. They were extra careful to make sure my wife's eating restrictions were taken care for. They had a before take off and landing announcements on the built in tablets for each seat and it gave out information that was very helpful. Such as what and how to declare your items in the specific country you landed in, any odd items that may be illegal to bring it (and even the reasoning why) and any other information you might need to make your post flight experience better. Oh and the seats were more comfortable, had more ability to lean and the headrest was much better for flight sleeping. The only downside was there were "forced" ads on the tablet at take off for maybe 5-10 minutes but honestly, this flight was the cheapest option and had all the benefits listed above that is such an easy trade off. Im keeping an eye out for EVA air going forward.

First time traveling with EVA.. great experience in economy class... Personnel very friendly..

Sub sandwhich for a snack through mid flight and giving a bottle water was a good idea

The flight attendants should be nicer, on my first flight I told them I’d prefer a veggie meal sometimes and then she began to lecture me about it, it was a late flight and I wanted an easy digestion meal so that I can sleep quickly. The meals were abit odd, breakfast on my last flight had eggs, oatmeal and fish, did not taste good at all, strange combination. The economy seats are very tight and crowded, not comfortable at all. Overall for the price I paid I thought I was going to get more.

seats are pitched well. you don't feel too tight.

For the price, it was better than other airlines; quality of food and service was very good.

Food was just okay, need to improve for other menu variations

The consistency with Singapore Airlines is fantastic. Crew are always brilliant and food delicious in business class

Wish the underseat compartment don’t have a restriction, can fit a personal item such as backpack fully like most Boeing

Best airline I think. No problems with anything. Crew were great, no problems with the airline food and entertainment and a smooth flight.

Service was top notch and the attention to passengers is great. Takeoff and landing was on schedule. Food selection is good

I was in a middle seat where I felt a bit too cramped otherwise the trip was good

The food wasn’t good at all. I skipped meals .

Food from Surabaya was below average but from Singapore is much better

Excelent service and plenty of food and drinks during the flight. Flight crew very attentive to our needs. Leg room between rows are very disappointing.

So happy I flew with Singapore Airlines. The customer service is top notch. I am terrified of flying and the staff made me feel so at ease. Will only fly Singapore internationally moving forward.

The flight (boarding) was delayed by 40-50 minutes and there was very crowed. They need to improve on the timeliness & boarding process. (They asked passenger to board in groups, but the 2nd group was standing there waiting for 20 minutes!). However, services from the crew was very good, also the food was good as well. I also found the legroom was quite comfortable.

Need to improve on punctuality. My flight was delayed by 1 hour.

Seats were uncomfortable and the vegetarian meal was awful. Some of the entertainment didn't work.

Except that our flight was cancelled, by mail, and later moved to 12 hours prior, then the experience was good. In Bangkok we were offered a hotel, it was fine, but would have been nice to know in advance😉

The flight was mostly fine, but I really wished that seats had an outlet to charge devices considering the length of the flight (15 hours there and 14 hours back).

Although booked meal of fruit only The crew had not received this special meal The same happened on my flight Bangkok / CAN The films are so old that best is to use own computer to watch downloads . Serve nuts but they do not warm up . Service is attentive , WC clean

Terrible. It’s like they are stuck in the dark ages. I brought a standard carry on suitcase and a back pack - I was told I could only carry on 7kg per bag - in business class, I was forced to remove articles from the suitcase and put them into my backpack! That’s the most ridiculous thing I’ve ever encountered in all my years of flying. The two bags weighed the same amount but one could not be more than 7kg. Holy cow.

They used Thai Smile plane, which is a smaller model and used to service only domestic flights; hence, the plane is small and quite compact. No entertainment on the flight. While boarding was delayed, it was done in a quick manner.

I give EVA 5 stars in every category. I enjoy this airline and it's great team of employees. I always highly recommend EVA to friends and family and everyone.

The flight was delayed going out of the gate at BKK that made it a difficult challenge to get through immigration transfer at tapei and make it to my departure on time. This appears to be a recurring issue. The flight crew and cabin crew were excellent. The food was very nice.

Lobster starter in business class was not good, tough, served cold, and without butter. Movie selection was missing latest releases, did not offer older classic, high quality movies

My baggage is lost. Flight cancelled, Rebooked ticket through long routes. Mental stress, emotional hurt

My flight was delayed. I was rebooked twice and even the second flight that was additional connection in London was delayed too, so I ended up spending more than 24 hours flying between four different countries and to be honest I’m not sure whether I ever want to use this airline again. My luggage is still delete. It’s been more than 48 hours now so to be honest, I’m not even sure how to describe the level of frustration I have.

My entire row did not have power for the full duration of a 14.5 hour flight. Could not charge any devices such as laptop or phones for the entirety of the long flight. The flight attendants tried to remedy the issue by resetting the power, but were not successful. The only other solution provided was to move me to another seat on the plane which was in the middle row. I had paid for a “preferred” seat that was a window seat. This was a downgrade being offered due to the power issue.

I prebooked a comfort plus seat on this flight and therefore the flight was comfy. I got the correct seat in the correct section of the plane that I have booked, that's this. Flight was comfortable. Staff were average on the flight, appearing to be rushed and short in engagement with travellers, perhaps this to maximise there rest time on the flight.

Economy travel is really hard with no room to move especially when the person sitting beside you is an XL or XXL size person who if moving could hit your face

Overall the experience was neat with crew being nice and caring especially to parent with kids. The free snacks option was okay. The kiosk at Philly airport didn’t work.

I felt that when I was rerouted it should have been to business class.

Terrible experience resolving missed connection after flight was delayed. 3 hour queue at transit desk, not enough staff, no organisation, worst ever flying experience.

The flight was smooth Thank God but the delays and changing gates for 3-4 times made me so tired of walking back and forth with heavy bags I thought I was going to pass out with heavy headaches but Thank God finally found the final gate and home safe. These delays happen anytime for important reasons so just be patient when you come across these situations.

main meals are horrible but then you dont fly for the food

It was good. Couldn’t Check in online and select seats

It was great. Enough space and room for legs . Great service to.

⭐ British Airways Review — A Journey of Highs, Lows, and Lessons ⭐ I recently flew Business Class round-trip from Boston to Mumbai with British Airways, and my experience was a tale of two extremes — from disappointment to exceptional service, and then back to inconsistency. Boston → London: A Surprisingly Poor Start My journey began on a disappointing note. On a 6-hour Business Class flight, I was surprised to discover that there wasn’t a single proper vegetarian meal option available. I was offered a few bakery items only after repeatedly requesting something to eat. The flight attendant shrugged, offered no solution, and eventually — quite literally — threw some bread at me after much delay. This was not only disheartening, it was extremely surprising given my wonderful Business Class experience with BA last year. I stepped off that flight genuinely hungry and had to make a mad dash to the lounge just to get a proper meal. London → Mumbai: A Complete Turnaround The next sector restored my faith in British Airways. The entire crew was warm, welcoming, attentive, and genuinely caring. A special shoutout to Phiroze and the entire team serving the Business Class cabin — their professionalism, hospitality, and thoughtful service were extraordinary. They truly embodied what makes British Airways a global leader, and I am deeply grateful for the experience they provided. This is the BA I know and love. Mumbai → London: A Strange Meal Schedule This sector was generally fine, but the meal timing was puzzling. Lunch at 10:30 AM — for a Business cabin — felt unusual, and most passengers, including myself, barely touched it. The rest of the service was smooth, but the scheduling definitely needs a rethink. London → Boston: Mixed Experience Again The flight itself was decent, but the Business Lounge at Heathrow for this leg was a letdown. Arrived during lunch hours: no hot vegetarian options available Lounge area: dirty dishes everywhere Even after politely alerting the staff, the dishes were ignored and left uncleared For a premium cabin passenger — and at one of the world’s busiest international hubs — this was disappointing. Overall Impression My journey with British Airways felt inconsistent — two great sectors sandwiched between two that fell short of the BA standard. When BA is good, it is world-class. When it misses, the gap is noticeable. I genuinely hope the airline takes this feedback as constructive insight. I continue to believe in British Airways, and I commend the outstanding crew on the London → Mumbai sector — they were the highlight of my entire trip. With a little more focus on vegetarian meal availability, lounge service, and consistency across crews, BA can ensure every Business Class passenger experiences the premium journey they promise.

We were in business class and I had seat # 1. This was a night flight and after dinner was served, lights were dimmed and I went to sleep. The crew were loud and noisy so I didn’t get much sleep. I expect the crew to enjoy themselves but would Appreciate some decency in staying quiet while the passengers sleep

Have travelled business class with other airlines who profess to be the best in the world. They can however not beat the service and comfort that BA provide.

Great on board entertainment Tasty food Cattle class obviously crammed but not as bad as shorter hall flights

Logan gate staff was unhelpful. Arrived early, come to find out the airbus scheduled was reassigned and I did not have a seat. The desk agent spoke to his supervisor who instructed him to give me a boarding pass to get up to gate area, he was polite. At the gate the fellow was sitting to the side with two other BA staff . I asked him if he could help me, his answer was” we are on a break, we are closed” then turned his back. I am almost 70, drove 4 1/2 hours to Boston and had been looking forward to this trip for 5 months. I have worked in service many times in my life and this is not how it is done. I eventually (1/2 hr) before boarding was able to get a seat. The rest of the flight experience was unremarkable.

The boarding process was chaotic at LHR and the seat was not as comfortable as other airlines....

Everything, every step of the process, from check in, to boarding, to exiting the plane was organized, efficient, and orderly. Excellent experience!

Everything you need to know for your flight from London to Ko Samui

Other airlines flying from London to Ko Samui

Flights from the other most popular airlines that fly from London to Ko Samui according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.