LON - PWM

£527 Find Cheap Flights from London to Portland

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 Portland departing on 24/4. 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 Portland

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

Cheapest return fare
£561
Overall average: £962
United Airlines
Wed 3/12Wed 10/12
LHR - PWM • 2 stops
Cheapest one-way flight
£458
Multiple Airlines
Fri 24/4
LHR - PWM • 1 stop
Top airlines
United Airlines
Cheapest • from £561 (return)
KLM
Best reviews • 7.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
September
Cheapest • 19% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Portland!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from London to Portland (LON-PWM)

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

Wed, 3 Dec - Wed, 10 Dec
United Airlines Logo
07:30 - 18:43LHR-PWM
16h 13m2 stops
United Airlines Logo
15:20 - 08:25PWM-LHR
12h 05m1 stop
£561United Airlines
Find Deal
Wed, 3 Dec - Wed, 10 Dec
United Airlines Logo
07:30 - 18:54LHR-PWM
16h 24m2 stops
United Airlines Logo
15:20 - 10:05PWM-LHR
13h 45m2 stops
£567United Airlines
Find Deal
Wed, 3 Dec - Wed, 10 Dec
Austrian Airlines Logo
12:00 - 18:43LHR-PWM
11h 43m1 stop
Austrian Airlines Logo
10:35 - 21:20PWM-LHR
29h 45m1 stop
£571Austrian Airlines
Find Deal
Wed, 3 Dec - Wed, 10 Dec
Air Canada Logo
11:10 - 23:09LHR-PWM
16h 59m2 stops
Air Canada Logo
06:00 - 06:30PWM-LHR
19h 30m2 stops
£577Air Canada
Find Deal
Tue, 13 Jan - Sun, 18 Jan
Air Canada Logo
13:25 - 13:56LHR-PWM
29h 31m2 stops
Air Canada Logo
19:27 - 07:10PWM-LHR
30h 43m2 stops
£591Air Canada
Find Deal
Tue, 13 Jan - Sun, 18 Jan
Delta Logo
10:10 - 00:20LHR-PWM
19h 10m1 stop
Delta Logo
14:35 - 20:10PWM-LHR
24h 35m1 stop
£626Delta
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Sat, 28 Mar - Tue, 31 Mar
Austrian Airlines Logo
09:10 - 18:13LHR-PWM
13h 03m1 stop
Austrian Airlines Logo
11:17 - 05:55PWM-LHR
13h 38m1 stop
£882Austrian Airlines
Find Deal
Mon, 24 Nov - Thu, 27 Nov
Delta Logo
08:55 - 23:54LHR-PWM
19h 59m2 stops
Delta Logo
06:00 - 08:05PWM-LHR
21h 05m2 stops
£3,907Delta
Find Deal
Sat, 22 Nov - Thu, 27 Nov
KLM Logo
16:35 - 23:54LHR-PWM
12h 19m1 stop
KLM Logo
09:00 - 08:05PWM-LHR
18h 05m1 stop
£8,114KLM
Find Deal
Sun, 23 Nov - Thu, 27 Nov
KLM Logo
16:35 - 23:54LHR-PWM
12h 19m1 stop
KLM Logo
09:00 - 10:15PWM-LHR
20h 15m1 stop
£8,313KLM
Find Deal
Booking Insights

KAYAK's insights & trends for London to Portland flights

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

How much is a return flight from London to Portland, Maine?

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 Portland, Maine departing in December.

What is the cheapest month to fly from London to Portland?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to Portland, 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 Portland is September, where tickets cost £553 (return) on average. On the other hand, the most expensive months are October and August, where the average cost of round-trip tickets is £860 and £829 respectively.

Good to know - Cheap tickets from London to Portland

Low seasonFebruary
Cheapest flight£527
Best time to beat the crowds (18% less expensive on average)
Most popular time to fly (9% more expensive on average)
Flight from London Heathrow Airport to Portland

When to book flights from London to Portland

Are your dates flexible? Find out the best times to travel from London to Portland 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 Portland

  • What is the cheapest flight from London to Portland?

    In the last 3 days, the lowest price for a flight from London to Portland was £458 for a one-way ticket and £561 for a return.

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

    There are 4 airports in London (London Gatwick, London Heathrow, London Luton, and London Stansted.) and only 1 airport in Portland (Portland). The cheapest flights are generally found on the London Heathrow Airport to Portland flight route.

  • Which aircraft models fly most regularly from London to Portland?

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

  • Which airline alliances offer flights from London to Portland?

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

  • Which is the best airline for flights from London to Portland, KLM or Finnair?

    The two airlines most popular with KAYAK users for flights from London to Portland are KLM and Finnair. With an average price for the route of £608 and an overall rating of 7.7, KLM is the most popular choice. Finnair is also a great choice for the route, with an average price of £754 and an overall rating of 7.6.

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

    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 Portland.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Portland 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 Portland?

    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 Portland 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 Portland?

    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 Portland 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 Portland

 
See real verified KAYAK customer reviews for airlines flying from London to Portland. 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 Portland? 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.
7.7
KLMOverall score based on 1405 reviews
7.3Food
7.7Comfort
7.8Boarding
8.4Crew
7.1Entertainment
Airline reviews

Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed

2.0 MediocreAbisola, Oct 2025CDG - AMS
Read more KLM reviews

Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

The service was great. However the lounge only gets passing grade

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

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.

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

Very disappointed with food service. They ran out of entree selections- so for the last 10 rows only option was lentil stew. Not a fan. Then the morning service (pizza twist) was lukewarm at best- I exited my 12 hour flight having eaten a roll and dessert. They knew it was a full flight.

Premium Plus is a really good idea for longer flights

7 hours delayed due to operational issues on United’s end. Basically laziness.

Short flight but an "eager to help" crew made the journey more enjoyable!

Not enough veg food available for passengers. I actually did not get the veg food and was told it was over, and I starved the entire flight duration.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Flight left on time. Boarding was easy. Arrived to EWR 30 mins early. Luggage was deplaned in good time. Overall a very good experience.

Flight from Rome to SFO was excellent compared To our flight to Europe from SFO. The food was much tastier. You can see how UNITED is skimping, though. Instead of getting something mid flight you had to ask for it. It was not automatically served. There was a cookie at the end of the arrival meal, for example that tasted like it just came out of a box. They used to serve a little container of nuts, now … a tiny container of nuts, mixed with pretzels. This was business class that you really have to pay for! But this is minor complaints compared to the overall. My major complaint is the position of the even numbered seats by the windows. You have to turn around to see your window & the positioning as some other controls are harder to get at. This is compared to the odd number seat that are perfectly aligned.

The person I bought the ticket for didn’t make the flight.

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.

Very pleasant flight attendants. Gate crew rather loud chatting with each other.

Four plus hour flight delay in New York caused us to take off after 11:30pm. We didn’t arrive at our hotel until five hours after check in. Started the trip off feeling exhausted.

Friendly crew. Poor food service maybe due to full flight. All in all, you get what you pay for.

Plane was in bad shape. TV’s and WiFi didn’t work. Plane need a refresh. Not enough room for bags.

Everything was great. I liked the text updates so that I never miss a gate change & I have all the latest info.

I don’t usually fly budget airlines or airlines in the United States. It was as good as any other airline. The seats are comfortable and the airline attendants are not rude & surly. Very nice flight (s).

They have the most inexperienced / rude flight staff I’ve encountered

very difficult boarding process - aggressive passengers not the friendliest crew

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

Smooth flight with enough time for connection. Ran out of meal options. In-flight and gate staff were friendly and helpful. Good service overall.

Paid for exit row at the back of the plane. Window seat with lots of leg space. Food was inedible (as usual). Brought my own.

The seat space seemed small especially when the person ahead reclined but other than that, very good.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

Give yourself over 2+ hours layover because if flight is slighlty delayed and you miss your connection, Lufthansa will do nothing for you

We would have missed our connection from Munich to Boston but we had a van outside the plan that wisked us to our terminal. Much appreciated and we didn’t even realize that Lufthansa had done this until the announcement on disembarkation. Well organized airline! Will definitely fly Lufthansa again!!!

Everything went well. I will fly with Lufthansa again. And use Kayak whenever I book flights

Bought a seat in a flight that got changed out so ended up paying for a seat I would have had if I hadn't paid.

Food was poor quality and the screens for entertainment didn’t work properly

Food was much better than my outbound flight. On-time. Good service. I had a problem with my entertainment screen, but the attendant fixed it promptly.

Everything you need to know for your flight from London to Portland

Information on your arrival and departure airports