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PWM - LON

Find cheap flights from Portland to London from $426

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Portland to London departing on 6/6. 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
0 bags
Sun 5/19
Sun 5/26

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Portland to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Portland to London, as well as popular online travel agencies
In the last 7 days travelers have searched 44,212,662 times on KAYAK, and here is why:

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Cheap flight deals from Portland to London (PWM-LON)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portland to London 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 and deals for you by selecting your travel dates.
Choose your dates
1:10 pm - 7:55 amPWM-LGW
13h 45m1 stop
10:30 am - 9:28 pmLGW-PWM
15h 58m1 stop
$643JetBlue
Find Deal
Wed, Oct 9 - Tue, Oct 15
1:10 pm - 9:30 amPWM-LHR
15h 20m1 stop
11:55 am - 9:28 pmLHR-PWM
14h 33m1 stop
$664JetBlue
Find Deal
Tue, Sep 24 - Tue, Oct 1
5:30 pm - 10:00 amPWM-LGW
11h 30m1 stop
12:00 pm - 11:38 pmLGW-PWM
16h 38m1 stop
$702KLM
Find Deal
Wed, Sep 25 - Tue, Oct 8
4:17 pm - 10:50 amPWM-LHR
13h 33m1 stop
9:50 am - 10:14 pmLHR-PWM
17h 24m2 stops
$707American Airlines
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Tue, Sep 24 - Tue, Oct 1
2:51 pm - 11:10 amPWM-LHR
15h 19m1 stop
9:55 am - 11:44 pmLHR-PWM
18h 49m2 stops
$709Delta
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Tue, May 7 - Fri, May 17
4:17 pm - 10:55 amPWM-LHR
13h 38m2 stops
9:50 am - 10:14 pmLHR-PWM
17h 24m2 stops
$710American Airlines
Find Deal
Tue, Sep 24 - Tue, Oct 1
2:51 pm - 8:05 amPWM-LHR
12h 14m1 stop
10:50 am - 11:57 pmLHR-PWM
18h 07m1 stop
$715KLM
Find Deal
Tue, May 7 - Fri, May 17
7:27 pm - 10:40 amPWM-LHR
10h 13m1 stop
6:50 am - 7:46 pmLHR-PWM
17h 56m2 stops
$729United Airlines
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Wed, Oct 9 - Tue, Oct 15
2:35 pm - 10:00 amPWM-LGW
14h 25m1 stop
12:00 pm - 11:06 pmLGW-PWM
16h 06m2 stops
$731Delta
Find Deal
Wed, Oct 9 - Tue, Oct 15
3:05 pm - 10:40 amPWM-LHR
14h 35m2 stops
6:50 am - 7:46 pmLHR-PWM
17h 56m2 stops
$733United Airlines
Find Deal
Wed, Oct 9 - Tue, Oct 15

Flights from Portland to London - Travel Insights & Trends

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Portland, Maine to London, 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 Portland, Maine to London is January, where tickets cost $558 on average. On the other hand, the most expensive months are June and July, where the average cost of tickets is $995 and $922 respectively.

How far in advance should I book a flight from Portland, Maine to London?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Portland, Maine to London, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Portland, Maine to London, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 70 days before departure.

Good to know

Low season

January

High season

April

Cheapest flight

$426
Best time to beat the crowds but there is an average 21% increase in price.
Most popular time to fly and prices are also 29% lower on average.
Flight from Portland to London Gatwick Airport

When to book flights from Portland to London

Are your dates flexible? Find out the best times to travel from Portland to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 Portland to London

  • What is the cheapest flight from Portland, Maine to London?

    In the last 3 days, the lowest price for a flight from Portland, Maine to London was $426 for a one-way ticket and $643 for a round-trip.

  • Do I need a passport to fly between Portland and London?

    Yes

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

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

  • Which airline alliances offer flights from Portland to London?

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

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

    The two airlines most popular with KAYAK users for flights from Portland to London are Delta and United Airlines. With an average price for the route of $777 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $861 and an overall rating of 7.4.

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

    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 Portland to London.

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

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

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

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

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

See more FAQs

Top 3 airlines serving from Portland to London

 
See real verified KAYAK customer reviews for airlines flying from Portland to London. 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 Portland to London? 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.
8.0
DeltaOverall score based on 11094 reviews
8.0entertainment
7.5food
7.9comfort
8.6crew
8.2boarding
Airline reviews

Seat back monitors and outlets were dead and not working.

8.0 ExcellentCarl, Apr 2024JFK - FLL
Read more about Delta reviews

Seat back monitors and outlets were dead and not working.

Everything was great except for the seat. The backrest would not stay in the upright position.

I usually have a positive experience with Delta. Complimentary upgrades are always nice!

Flight delayed about 2 hrs so it made it a VERY late night

The crew, food, and entertainment were all good. But my screen had some sort of bug where if I turned it off, it would turn back on after 2-5 minutes. At full brightness. It made it very hard to get any shut-eye on the overnight flight. Also, the older Boeing plane, while nicely cared for (and no doors fell off 😅👏) doesn't have the nice air quality of newer planes. So I felt a bit greasy by the time we landed in Sweden.

It was a crowded flight. They did the best they could.

Service was good for such a short flight. Small plane but smooth flight.

Worst flight in my life. Only was scheduled for a 45 min flight to get our connection flight. It was late by 40 minutes and we missed our connection. Delta was totally useless trying to help and unable to get my family on the next flight because they overbooked it Thus had to get a hotel at my expense and lost a day at Disney as a result. Cost me about a $1000 if you add 2 hotels meals shuttles etc to get thru the day Awful customer service by Delta in Detroit totally useless people

The experience was good and the flight departed on time and landed early

The flight was delayed but we got to our final destination.

I just wrote a text which was supposed to be for the flight from Denver to spokane not Frankfurt to Denver.

On time every leg of the journey and exceptional staff at counter, gate, and on board. I haven’t travelled in US for a long time and was genuinely surprised how pleasant this was.

Hated every minute of it. This flight should have only taken 1.5hrs but was delayed over 10hours. Now I am being told I cannot be compensated or refunded my ticket price or extra leg room, which I purchased but did not receive, because the airline is throwing the blame on the 3rd party I purchased tickets through and 3rd party putting the blame on airline. No one wants to help. They received their money and that's all they care about. Im going on 3 days of still trying to get to my final destination, had to cancel car rental, car insurance and hotel. Currently staying in airport until hotels open up. Thank you Lufthansa, Kayak, Underpricer and United for making this trip the worst ever.

The delays (5 hrs) were a comedy of errors, and the multiple safety issues encountered were very concerning.

flight delays, staff only communicating when pushed, food service lasting a grand total of 7 minutes, stuck in seat from 45mins into flight until landing

Crew was great and did their best to make us comfortable and captain came out at the beginning to announce why the flight was delayed, weather situation up ahead, and kept us updated throughout the flight.

the flight from Tampa departed with a delay. The food on board was poor, usually on international airlines alcoholic beverages are offered free of charge , but here it was for a fee, the cutlery was wooden, there were no hot drinks (tea, coffee). Unfortunately, I didn't take pictures of the portions of food, but it wouldn't have been enough for a child either.And in the future, I will try not to use the services of this airline

they made me check my carryon. There was space in the overhead bins.

Nice flight, nice crew but no cookie or napkin with my seltzer.

Trip was smooth bumpy from the wind but no issues at all the crew attendant was very pleasant and had great customer service

The return trip was a customer service disaster. American Airlines needs an overhaul of how they treat their customers.

Was flying in premium eco and there were around 5-6 movies I wanted to watch and none of those could I play for some reasons. Not just me we checked w the person sitting next to me. Few of the movies were only playable :( Also that was not great that we couldn't upgrade to business however tried to, many times before the flight :(

You cancelled my flight by email then made it very difficult to get in contact with you. Then put me in a flight with a long layover in Mexico returning to the wrong airport in uk. Mind blowing my stressful. I missed see my grand dad because of you.

This was not the BA business class it used to be. Mediocre food, attendants seemed stretched thin. All the little luxuries that used to make BA business fun were missing. Flight delayed and the explanation given was they forgot to pick up crew - I hope I misheard! Transfer in LHR “sticky” - we thought we had way too much time at 3hours but it was needed. Next time will try different route.

Always getting updates by email very easy to check in on line. There was plenty of checking in staff to get you all through. It was nice that the flight attendants took time to talk to you and were interested in your holiday.

Flight from Phoenix to London was very quiet. Excellent space available for comfort, couldn't fault

Food was very average. And top up drinks offer was absent. For a 11 hour long flight that should be the minimum. The crew didn't want to be there. I understand it was new year day but given they had signed up for it

It was my fault choosing the seat nearest the entrance but it was ok.

It was good, the staff was friendly and it was a typical flight to Europe.

My flight was a little marred by poorly fuctioning / loose headphone sockets meaning I had to move twice. The meals were good and the staff are always amazing, attentive and friendly. My bag was lost on my previos trip with BA for 15 days of my 18 day trip, however I experienced no such issues this time despite my fears. Overall ok but aircraft need better looking after.

Book cheap flights from Portland to London

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Portland to London found on KAYAK in the last 72 hours.
6/6Thu
1 stop
17h 20mPWM-LGW
$426
6/6Thu
2 stops
54h 58mPWM-LGW
$438
6/6Thu
3 stops
40h 20mPWM-LGW
$571
6/6Thu
3 stops
28h 41mPWM-SEN
$870
6/6Thu
3 stops
41h 21mPWM-LCY
$897
6/6Thu
2 stopsUnited Airlines
16h 58mPWM-LCY
$1,130

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Last minute flights from Portland to London

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Portland to London that are departing in the next 10 days.
4/22Mon
multi-stop
14h 45mPWM-LGW
4/24Wed
multi-stop
27h 00mLGW-PWM
$1,254
4/22Mon
multi-stop
14h 45mPWM-LGW
4/24Wed
multi-stop
18h 14mLGW-PWM
$1,856
4/22Mon
multi-stopAmerican Airlines
22h 50mPWM-LHR
4/24Wed
multi-stopAmerican Airlines
21h 01mLHR-PWM
$2,148
4/22Mon
multi-stop
9h 33mPWM-LHR
4/24Wed
multi-stop
13h 31mLHR-PWM
$2,388
4/22Mon
multi-stop
15h 40mPWM-LHR
4/24Wed
multi-stop
19h 32mLHR-PWM
$2,426
4/22Mon
multi-stopVirgin Atlantic
20h 08mPWM-LCY
4/24Wed
multi-stopVirgin Atlantic
17h 46mLCY-PWM
$3,394
4/22Mon
multi-stopAir Canada
18h 25mPWM-LHR
4/24Wed
multi-stopAir Canada
19h 32mLHR-PWM
$4,357

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Portland - London Flights

Departure:

Portland (PWM)United States

Cabin classes: