LON - PWM

£353 Find Cheap Flights from London to Portland – Compare and Save

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 16/9. 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

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Everything you should know

Cheapest return fare
£515
Typical prices: £581-£1,569
JetBlue
Fri 4/9Fri 18/9
LHR - PWM • 1 stop
Cheapest one-way flight
£353
JetBlue
Wed 16/9
LHR - PWM • 1 stop
Top airlines
Cheapest • from £515 (return)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
Not available
There are currently no direct flights between London and Portland. You’ll need at least 1 connection.
Insights
Insights
Insights
Insights
Top stopover airports
Cheapest • Avg £752 (return)
Shortest trip • 11h 13m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 29% price drop
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 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

Fri, 4 Sep - Fri, 18 Sep
JetBlue Logo
08:15 - 00:25
LHR
-
PWM
21h 10m
1 stop
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
£515JetBlue
Thu, 3 Sep - Wed, 9 Sep
JetBlue Logo
11:55 - 13:55
LHR
-
PWM
31h 00m
1 stop
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
£518JetBlue
Thu, 3 Sep - Wed, 9 Sep
JetBlue Logo
08:15 - 00:25
LHR
-
PWM
21h 10m
1 stop
JetBlue Logo
06:00 - 09:30
PWM
-
LHR
22h 30m
1 stop
£521JetBlue
Sat, 19 Sep - Tue, 29 Sep
JetBlue Logo
08:15 - 23:52
LHR
-
PWM
20h 37m
1 stop
JetBlue Logo
06:00 - 09:30
PWM
-
LHR
22h 30m
1 stop
£523JetBlue
Tue, 1 Sep - Tue, 8 Sep
JetBlue Logo
11:55 - 13:45
LHR
-
PWM
30h 50m
1 stop
JetBlue Logo
13:17 - 20:45
PWM
-
LHR
26h 28m
1 stop
£527JetBlue
Thu, 3 Sep - Wed, 9 Sep
JetBlue Logo
08:15 - 00:25
LHR
-
PWM
21h 10m
1 stop
JetBlue Logo
06:00 - 09:30
PWM
-
LHR
22h 30m
1 stop
£536JetBlue
Thu, 3 Sep - Wed, 9 Sep
Scandinavian Airlines Logo
07:05 - 00:59
LHR
-
PWM
22h 54m
2 stops
Scandinavian Airlines Logo
06:02 - 09:35
PWM
-
LHR
22h 33m
2 stops
£544Scandinavian Airlines
Wed, 9 Sep - Sun, 13 Sep
JetBlue Logo
11:55 - 23:52
LHR
-
PWM
16h 57m
1 stop
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
£550JetBlue
Wed, 7 Oct - Sun, 11 Oct
JetBlue Logo
08:15 - 23:52
LHR
-
PWM
20h 37m
1 stop
JetBlue Logo
06:00 - 09:30
PWM
-
LHR
22h 30m
1 stop
£555JetBlue
Wed, 7 Oct - Sun, 11 Oct
JetBlue Logo
08:15 - 23:52
LHR
-
PWM
20h 37m
1 stop
JetBlue Logo
06:00 - 09:30
PWM
-
LHR
22h 30m
1 stop
£562JetBlue
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 September.

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 February, where tickets cost £501 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is £1,055 and £947 respectively.

Good to know - Cheap tickets from London to Portland

Low season

January

Cheapest flight

£353
Best time to beat the crowds (17% less expensive on average)
Most popular time to fly and prices are also 18% lower 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 5 days, the lowest price for a flight from London to Portland was £353 for a one-way ticket and £515 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?

    Star Alliance is the only airline alliance operating flights between London and Portland.

  • Which is the best airline for flights from London to Portland, United Airlines or JetBlue?

    The two airlines most popular with KAYAK users for flights from London to Portland are United Airlines and JetBlue. With an average price for the route of £844 and an overall rating of 7.4, United Airlines is the most popular choice. JetBlue is also a great choice for the route, with an average price of £638 and an overall rating of 7.1.

  • 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 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.
7.4
United AirlinesOverall score based on 10020 reviews
6.7Food
8.1Crew
7.1Entertainment
7.7Boarding
7.3Comfort
Airline reviews

Very friendly and helpful staff on board and United was excellent when I missed my onward flight due to the delay in London. Very well organised meant much less stress

8.0 ExcellentMarianne, May 2026
LHR - DEN
Read more United Airlines reviews

Very friendly and helpful staff on board and United was excellent when I missed my onward flight due to the delay in London. Very well organised meant much less stress

First time flying with UA and it was a great experience. Thank you

Staff on board was excellent. Positive upbeat helpful- like it used to be.

United has come a long way, it’s been a fantastic experience traveling with them.

The flight attendants were very rude, beyond comprehension. I took a business class from London to SFO for the first time on United. When I asked for a second piece of bread during dinner, the serving attendant threw a 3rd bread on my plate and said, “here. You can have this one too”! I couldn’t believe the rudeness of the attendant. Most all attendants were very rude, unhelpful, sing the food was absolutely disgusting. Never fly United internationally in business class. My flight back to SFO was a nightmare!!

Our experience on United Airlines was extremely poor. The plane was extremely cold throughout our entire flight- which multiple people complained about- and we had to wait 2 hours to get a blanket which was too thin and barely helped warm us up. As well as this, none of the entertainment features were working so we had to sit through a roughly 10 hour flight with nothing to keep our attention, including the actual flight path screen. It was an extremely disappointing experience and I would hope that this gets fixed if we ever choose United Airlines again.

Cabin crew was very friendly, requests were satisfied promptly and cheerfully, and the cabin was reasonably clean when I boarded. The United lounges at Newark and Heathrow are always well-run and comfortable, especially Newark. I look forward to the new lounge that will be part of the rebuild of Terminal 2 at Heathrow.

The senior flight attendants were amazing. Totally different vibe from other carriers. Easy 10 hour flight in Business Class. Great food. Good humor as well.

I was lucky to sit in a seat with legroom in economy . The airplane felt like it was 100 years old, seats were very basic, barely reclined. Food was alright , staff was ok but not the friendliest. But all in all ok trip, perfectly on time

My wallet fell out of my pocket ( my fault). Staff claimed they looked while cleaning. Said they didn't find it, but was actually found in Washington DC on the plane. Which mean either they didn't look or don't do a good job of cleaning. Now I have to pay 27 dollars to get it shipped back and have no wallet for my entire vacation

The security line at JFK was one of the longest I’ve ever experienced - probably 45 minutes. I don’t know if JetBlue has control over it, but it detracted from the overall experience. Entertainment had good options, but the volume control was a bit small to tap on and the screen had a fair amount of interference blips. Clearer picture would have been better.

I liked the entertainment on JetBlue, the service from JFK to JAX was terrible at best

Checking-in in Barbados was excellent, connecting in JFK to JAX was a nightmare, had to wait over 1 hour and 20 minutes to receive my check bag. After receiving my checked bag and going to the gate to check in for my flight to Jax the crew there had no clue. They first told me that I had missed the flight and had to rebooked.. after trying to speak with JetBlue reservations (without luck) I was asked to leave my Phone number for a recall, I did so and my call was returned after 15 hours. I finally looked at the information board and saw the flight that I was originally scheduled for was still at the gate. I alerted an JetBlue employee of my findings and was told to rush to the gate and see if I could still board. The agent at the boarding gate apparently was having a very bad day, after lecturing me on how late I was (which was not a fault of mine) let me on the flight. A VERY BAD EXPERIENCE. I will NEVER fly JetBlue ever in my life again.

I usually dont fly JeTBlue and I dont think I will ever do it again. The flight was delayed fee time, nobody was giving us any info at at the airport, gate changing, the slowest and poorly organized boarding ever, rude staff.. huh

The flight was delayed. I upgraded to more room. I can't imagine how small the regular seats are I haven't upgraded for my return flight yet.

Boarding process was terrible. No assigned seat until the gate, then a long line to get seat assignment.

Jetblue provided a very good service during the flight, the plane in a very good condition, the crew is professional, everything was on time. That's it!

The regular feedback of any changes to our flights. The Jetblue staff were very helpful. Our flights were great. Lots of leg room!

Over 2 hour delay for a 50-minute flight is unacceptable, especially in normal weather. Very poor communication via app

We liked the flight, but not in JFK, not in Gatwick it is no lounge and this was surprising and disappointing. I think by now it is understandable that COVID will not go away and why it should not be business lounge?

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

Information on your arrival and departure airports