LON - SJU

£276 Find Cheap Flights from London to San Juan

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 San Juan departing on 1/3. 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 San Juan Luis Munoz Marin Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to San Juan.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to San Juan.
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Everything you should know

Cheapest return fare
£526
Typical prices: £535-£822
JetBlue
Tue 13/1Mon 26/1
LHR - SJU • 1 stop
Cheapest one-way flight
£276
Multiple Airlines
Sun 1/3
SEN - SJU • 2 stops
Top airlines
JetBlue
Cheapest • from £547 (return)
Finnair
Best reviews • 7.6 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 13% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
September
Cheapest • 21% price drop
December
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 San Juan!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from London to San Juan (LON-SJU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from London to San Juan 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 San Juan

Tue, 13 Jan - Mon, 26 Jan
JetBlue Logo
09:20 - 22:55
LHR
-
SJU
17h 35m1 stop
JetBlue Logo
11:06 - 09:30
SJU
-
LHR
18h 24m1 stop
£526JetBlue
Mon, 23 Feb - Sun, 1 Mar
Multiple Airlines Logo
14:00 - 00:43
LGW
-
SJU
14h 43m1 stop
Multiple Airlines Logo
15:30 - 17:50
SJU
-
LGW
22h 20m2 stops
£528Multiple Airlines
Tue, 24 Feb - Fri, 27 Feb
Multiple Airlines Logo
13:00 - 11:37
LGW
-
SJU
26h 37m2 stops
Multiple Airlines Logo
08:50 - 06:00
SJU
-
LGW
17h 10m1 stop
£529Multiple Airlines
Fri, 16 Jan - Thu, 22 Jan
Multiple Airlines Logo
14:00 - 09:47
LGW
-
SJU
23h 47m1 stop
Multiple Airlines Logo
08:00 - 10:00
SJU
-
LGW
22h 00m1 stop
£529Multiple Airlines
Tue, 13 Jan - Sat, 24 Jan
JetBlue Logo
09:20 - 22:55
LHR
-
SJU
17h 35m1 stop
JetBlue Logo
10:25 - 09:30
SJU
-
LHR
19h 05m1 stop
£531JetBlue
Sat, 17 Jan - Mon, 26 Jan
Multiple Airlines Logo
14:00 - 09:47
LGW
-
SJU
23h 47m1 stop
Multiple Airlines Logo
08:00 - 10:00
SJU
-
LGW
22h 00m1 stop
£538Multiple Airlines
Wed, 11 Mar - Fri, 20 Mar
Multiple Airlines Logo
13:00 - 00:48
LGW
-
SJU
39h 48m2 stops
Multiple Airlines Logo
16:40 - 06:00
SJU
-
LGW
33h 20m1 stop
£539Multiple Airlines
Fri, 27 Feb - Tue, 3 Mar
British Airways Logo
06:50 - 23:44
LCY
-
SJU
20h 54m2 stops
British Airways Logo
21:25 - 14:05
SJU
-
LCY
12h 40m1 stop
£849British Airways
Mon, 26 Jan - Thu, 5 Feb
Iberia Logo
19:15 - 19:55
LCY
-
SJU
28h 40m1 stop
Iberia Logo
21:25 - 08:50
SJU
-
LCY
31h 25m1 stop
£858Iberia
Mon, 26 Jan - Thu, 5 Feb
Iberia Logo
19:15 - 19:55
LCY
-
SJU
28h 40m1 stop
Iberia Logo
21:25 - 08:50
SJU
-
LCY
31h 25m1 stop
£860Iberia
Booking Insights

KAYAK's insights & trends for London to San Juan flights

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

How much is a return flight from London to San Juan Luis Munoz Marin Intl Airport?

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 San Juan Luis Munoz Marin Intl Airport departing in January.

What’s the cheapest day of the week to fly from London to San Juan?

The average price of all round-trip flights from London to San Juan Luis Munoz Marin Intl Airport clicked on KAYAK for each day over the last 12 months.

For London to San Juan, Monday is the cheapest day to fly on average and Friday is the most expensive. Flying from San Juan back to London, the best deals are generally found on Tuesday, with Saturday being the most expensive.

What is the cheapest month to fly from London to San Juan Luis Munoz Marin Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to San Juan Luis Munoz Marin Intl Airport, 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 San Juan Luis Munoz Marin Intl Airport is September, where tickets cost £531 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is £959 and £934 respectively.

How far in advance should I book a flight from London to San Juan Luis Munoz Marin Intl Airport?

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 San Juan Luis Munoz Marin Intl Airport, 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 San Juan Luis Munoz Marin Intl Airport, you should book around 4 weeks before departure, which saves you about 13% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Good to know - Cheap tickets from London to San Juan

Low seasonJune
Best time to beat the crowds (7% less expensive on average)
Most popular time to fly (42% more expensive on average)

When to book flights from London to San Juan

Are your dates flexible? Find out the best times to travel from London to San Juan 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 London to San Juan flights

  • What is the cheapest flight from London to San Juan Luis Munoz Marin Intl Airport?

    In the last 3 days, the lowest price for a flight from London to San Juan Luis Munoz Marin Intl Airport was £276 for a one-way ticket and £526 for a return.

  • Which airports will I be using when flying from London to San Juan?

    London has 5 major airports: London City, London Gatwick, London Heathrow, London Luton, and London Stansted. San Juan Luis Munoz Marin Intl is the only airport in San Juan. You’ll usually find the cheapest deals if you fly from London Heathrow Airport.

  • Which aircraft models fly most regularly from London to San Juan?

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

  • Which airline alliances offer flights from London to San Juan?

    SkyTeam, and oneworld are the airline alliances operating flights between London and San Juan, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from London to San Juan, Finnair or Virgin Atlantic?

    The two airlines most popular with KAYAK users for flights from London to San Juan are Finnair and Virgin Atlantic. With an average price for the route of £545 and an overall rating of 7.6, Finnair is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of £911 and an overall rating of 7.5.

  • How does KAYAK find such low prices on flights from London to San Juan?

    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 San Juan.

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

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

  • What is the Hacker Fare option on flights from London to San Juan?

    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 San Juan 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 San Juan?

    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 San Juan from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines flying from London to San Juan

 
See real verified KAYAK customer reviews for airlines flying from London to San Juan. 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 San Juan? 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.
7.6
FinnairOverall score based on 1338 reviews
6.9Entertainment
7.6Boarding
6.7Food
8.1Crew
7.4Comfort
Airline reviews

All reviews good because...flight from BWI to London ,economy seats was miserable. I usually book 1,step up from economy but this would have added 1500 bucks 1 way. Bit the bullet and upgraded for retun flight, otherwise all ratings would have been rock bottom.

8.0 ExcellentDavid, Oct 2025
LHR - BWI
Read more Finnair reviews

All reviews good because...flight from BWI to London ,economy seats was miserable. I usually book 1,step up from economy but this would have added 1500 bucks 1 way. Bit the bullet and upgraded for retun flight, otherwise all ratings would have been rock bottom.

Great. It was awesome to have boarding from the front and back of the plane as it made the process go very quickly

It was okay. The airplane was a little smaller than a flight from Thailand to Helsinki.

Wish that everyone would board the back of the plane first. Also let kids on first. The gate wasn’t open at arrival and we waited 45 minutes to takeoff. They made up for time in the air.

This was an absolutely exceptional flight. The flight attendants were extremely attentive and very friendly. They seemed to go out of their way to make us comfortable and to make sure that we had everything we needed., We were in business and were very happy with the size and the details for our pods. We would definitely recommend Finnair and will definitely be flying with them again.

We had an excellent trip with Finnair. This was our first time and we’re very pleased. The only issue was with the boarding - it was a little bit confusing and needs a little bit of streamlining.

Crew very lovely. Arrived an hour late due to bad weather. We were given new tickets to an other flight but it could have been organised better, so we did not have to run through the whole airport to.

Flight delayed over an hour. They said they would hold our connection but then did not.

Major problems checking in at Alaska counter. They could not find our booking code because it came from Finnair.

Do not use KAYAK or Finair for future travel. Unless you purchase the tickets directly from the airline, you were going to have a difficult time checking in. Kayak canceled my flights twice and ended up causing great difficulty in me getting back from Europe because they double sold my tickets between American Airlines and Finair. The event caused significant delays and led to me having to rebook my flights.

we were delayed because of some safety check that wasn't done or available

Qatar Airways only had spicy meals on the menu in economy class. You might want to get food in the airport before boarding.

The flight was two hours late due to a computer fault and resulting maintenance. Nothing was offered as compensation beyond bottles of water during the time we were deplaned and waiting in the terminal.

WiFi was not eorkig (again) And the plane was from 1990 with the screens which were.not touch and most didn’t even work and if lucky could tune in tv

JetBlue is always consistent and great, the food is limited in selection, but at least you can grab as much as you want on snacks and drinks at the Blue Locker.

Too many long delays with JetBlue. Worst major airline that serves JFK but unfortunately I keep going back because of the prices.

To not have food or proper snacks on a 5 hour flight was the worst.

I especially liked the lead crew officer. His boarding and safety announcements were made with a bit of novelty and humor. The flight also left the gate 10 minutes early and we landed about 20 minutes early… It was a delightful flight…

flight was delayed for hours with no explanation. The plane was a very old aircraft.

The check in and boarding process was a bit of a cluster. Two people at the counter to check in, three random lines that nobody knew which was for what, and people kept getting shuffled from one line to another for no apparent reason because then they’d get shuffled back and end up getting out further back in the line than they were originally. I only had to hand my already checked bag over and it took 45 minutes. I was never assigned a seat so when I tried to board I was pulled out of line again while someone had to try to manually assign me a seat. During the flight I got up to go to the bathroom, and there was an attendant in the aisle offering pillows etc and it was a 30 min wait unbuckled standing by the bathrooms because she said I couldn’t go past her. First and last time flying jet blue to be honest.

Again, we paid $ 328.00 for specific seats are were assigned those seats.

Never again. Terrible hospitality and human decency for an international flight. No food, no snacks, no beverages, blankets, pillows, limited entertainment. Tiny seats without any cushion and some do not even recline. I was shocked that they did not charge for seat belts. Never in my life have I witness asking for "spare change" for charity before landing on both legs of the flight. Icelandair can contribute on their own to said, so called, children's charity with the money saved from providing 3 centimeters of tea and water to hungry and dehydrated passengers.

If there was a disclaimer regarding food service or lack thereof, l missed it. If l had known l would have prepared better. Same with transferring at Reykjavik. No information about disembarking via stairs into rain, slush and puddles deep enough to swallow a foot. After being treated to haute cuisine restaurants and warm inviting environment during the flight, the airport is, let’s be kind, disappointing. Plane was comfortable, Airbus, staff were welcoming enough. I would likely try the route again. Maybe have a night and day in Iceland. Maybe not.

Iceland air transfer was bad. They lost my luggage and I just received it 11/1

It was too cold in the plane my feet froze

Service was excellent. Food and drinks were very good except for a greasy lump of a donut at the end of the flight that left us both feeling internally disgusted.

Handling our luggage was the biggest issue - they lost it and we got it almost 3 days later. Really threw off the beginning of our trip and we really had to change our itinerary accordingly.

Seat was hard and uncomfortable and the temperature too warm and uncomfortable.

I flew Icelandair with my partner from Prague to the US. Overall flight time was around 12 hours, with a connecting flight in Iceland. I have flown internationally for years and with multiple airlines. Every airline serves you a meal when traveling internationally. Icelandair not only did not offer an inclusive meal, but they did not even offer a snack. The only things they served over our long flight was water and coffee. Ridiculous! Never again will I fly with Icelandair.

Worst airline I’ve ever flown. Delayed 5.5 hrs, missed connecting flight, and missed an entire day of vacation. Zero customer service

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

The crew was amazing. I appreciate the level of professionalism in the Iberia crew.

I've taken British Airways before and it has been great. On this trip to Spain and Portugal we had two BA flights. On both flights we were taken by bus from the terminal out to the plane on the tarmac. There were many older folks on these flights, and to ask people in their 70s to lug their carry-on and personal items up the long mobile staircase to the plane entrance, is very disturbing. I won't be taking British Airways in the future. Many people on these flights were very unhappy.

We were delayed 2 hours because the crew was late. They need better planning by the crew, we had to sit in uncomfortable seats waiting for them.

Difficulty to check in online, but well handled at the airport. Flight delay was unfortunate. Crew was adequate but not what we have usually experienced from BA. Seat was not comfortable.

Moved the flight an hour later, were not reliable about confirmation, website didn't work, no gate information, boarding was a mad house. Flight itself was fine and short. Organization needs work.

Charging $300 to be able to pick a seat next to your wife was nothing less than extortion.

Flight boarded three hours late for no reason other than someone made a huge error in crew scheduling. We missed our connecting flight in Madrid and got zero help from American or Iberian airlines on rebooking. We had to pay for a car to take us to the Madrid train station and pay for train tickets to Santiago. We never used our booked flight to Santiago. American claims I can submit the expenses but they are not obligated to cover them. Very frustrating.

I’m very mad because I paid an extra $105 to change seats to an exit row with more leg room. The app clearly showed a gap in between the seats in the row I changed my seat to and I paid for it. When I boarded the plane, it wasn’t an exit row seat and no more room than my original seat. I feel like I was ripped off $105.

They cancelled the flight)(they said bad weather but many other flights took off) and made us wait 5 hours in line to figure out what to do. We ended up making a new flight the next day on another airlines...I hope they honor giving us our money back

People were nice. Seats are so cramped my knees had to be pressed into the seat in front of me.

Overall, the food and entertainment were great. The staff were amazing, polite and professional. They did not have WiFi on board on this leg but that was okay. There was a delay in boarding from London and landing at Mumbai airport but the pilot communicate DC the reason for the delayed landing. They even sent us an apology afterwards for the delayed landing.

I was in a bulkhead seat and my tray table wasn't level. Eating was difficult.

Nice lounge but had a 5 hour layover which is a lot

Flight on time and priority boarding worked. I travelled economy although business was available as no flights are cheap these days and at least with BA loyalty card I get a baggage allowance for nothing. That made the flight comparable or even cheaper than the ‘budget’ alternative. As for catering and entertainment - not on a BA short haul economy ! At least we were offered biscuits and water! Catering for economy short haul has been reduced to the minimum - no tea or coffee or other drinks than water (from a large bottle with a paper cup on offer). They will say this is better for the environment, which it is, but proper waste management is still needed for empty packets etc. so actually it’s a money saver.

Audi visual not working for a whole group of seats in first class. How does a plane leave the main hub in such poor condition? How much that we can’t see so immediately is also compromised?

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.

Everything you need to know for your flight from London to San Juan

Information on your arrival and departure airports