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PWM - LON

$504 Find cheap flights from Portland, Maine to London

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 9/5. 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
sáb 6/22
sáb 6/29

Search hundreds of travel sites at once for deals on flights to London

 
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 43,800,826 times on KAYAK, and here is why:

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

 
These are the cheapest deals for flights from Portland to London currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Portland to London

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Portland to London.

Recent one-way flight deals from Portland to London

Only flying one-way? Below are some of the best one-way flight deals from Portland to London found on KAYAK recently.

Recent last minute flight deals from Portland to London

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from Portland to London.

Recent direct flight deals from Portland to London

The latest deals for direct flights from Portland to London so you can sit back and relax without the need for a layover.

Cheap bus & train deals from Portland to London

Find recent round-trip train or bus tickets from Portland to London.

All round-trip flight deals to London

The cheapest plane tickets to London found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
1:06 pm - 9:30 amPWM-LHR
15h 24m1 stop
11:55 am - 9:29 pmLHR-PWM
14h 34m1 stop
$627JetBlue
Find Deal
ter, set 24 - ter, out 1
1:06 pm - 7:55 amPWM-LGW
13h 49m1 stop
10:30 am - 9:29 pmLGW-PWM
15h 59m1 stop
$715JetBlue
Find Deal
qua, set 25 - dom, set 29
12:55 pm - 10:00 amPWM-LGW
16h 05m2 stops
12:00 pm - 11:38 pmLGW-PWM
16h 38m1 stop
$719Delta
Find Deal
qua, set 25 - ter, out 8
8:00 am - 7:45 amPWM-LHR
18h 45m1 stop
9:50 am - 10:14 pmLHR-PWM
17h 24m2 stops
$720American Airlines
Find Deal
qua, set 25 - ter, out 8
4:17 pm - 10:20 amPWM-LHR
13h 03m2 stops
9:50 am - 10:14 pmLHR-PWM
17h 24m2 stops
$723American Airlines
Find Deal
qua, set 25 - ter, out 8
6:00 am - 6:30 amPWM-LHR
20h 30m2 stops
1:25 pm - 11:11 pmLHR-PWM
38h 46m2 stops
$735Air Canada
Find Deal
seg, out 28 - qui, nov 7
6:00 am - 8:35 pmPWM-LHR
10h 35m1 stop
11:10 am - 11:48 pmLHR-PWM
17h 38m2 stops
$737United Airlines
Find Deal
seg, out 28 - qui, nov 7
12:55 pm - 6:45 amPWM-LHR
12h 50m1 stop
9:00 am - 11:38 pmLHR-PWM
19h 38m2 stops
$744Delta
Find Deal
ter, set 24 - ter, out 1
7:22 pm - 6:45 amPWM-LHR
30h 23m1 stop
6:50 am - 11:59 pmLHR-PWM
22h 09m2 stops
$770United Airlines
Find Deal
sáb, ago 10 - ter, ago 27
12:28 pm - 10:00 amPWM-LHR
16h 32m3 stops
6:00 pm - 2:31 pmLHR-PWM
25h 31m3 stops
$863Air Canada
Find Deal
qua, set 25 - ter, out 8
5:03 pm - 9:50 amPWM-LGW
35h 47m3 stops
qui, set 5
6:30 am - 8:10 amPWM-LGW
20h 40m2 stops
qui, set 5
12:55 pm - 6:45 amPWM-LHR
12h 50m1 stop
$598KLM
Find Deal
qui, set 5
1:06 pm - 10:05 pmPWM-LHR
27h 59m2 stops
$614TAP AIR PORTUGAL
Find Deal
qui, set 5
6:30 am - 5:20 pmPWM-LHR
29h 50m3 stops
qui, set 5
1:06 pm - 8:40 amPWM-LCY
14h 34m2 stops
qui, set 5
2:35 pm - 10:00 amPWM-LGW
14h 25m1 stop
$812Delta
Find Deal
qui, set 5
12:21 pm - 7:45 pmPWM-SEN
26h 24m3 stops
qui, set 5
1:06 pm - 3:35 pmPWM-LGW
21h 29m2 stops
$2,033TAP AIR PORTUGAL
Find Deal
seg, set 30
3:00 pm - 8:05 amPWM-LHR
12h 05m1 stop
$3,077KLM
Find Deal
seg, set 30
2:24 pm - 9:30 amPWM-LHR
14h 06m1 stop
7:25 am - 1:29 pmLHR-PWM
11h 04m1 stop
$1,327JetBlue
Find Deal
dom, mai 26 - sex, mai 31
10:09 am - 6:55 amPWM-LHR
15h 46m1 stop
10:00 pm - 9:09 amLHR-PWM
40h 09m2 stops
$1,688
Find Deal
dom, mai 26 - sex, mai 31
2:24 pm - 5:00 pmPWM-LHR
21h 36m2 stops
11:25 am - 1:29 pmLHR-PWM
31h 04m2 stops
$2,193
Find Deal
dom, mai 26 - sex, mai 31
11:55 am - 6:30 amPWM-LHR
13h 35m2 stops
8:40 am - 1:51 pmLHR-PWM
34h 11m3 stops
$2,361
Find Deal
dom, mai 26 - sex, mai 31
11:55 am - 1:00 pmPWM-LHR
20h 05m3 stops
8:40 am - 1:51 pmLHR-PWM
34h 11m3 stops
$3,085
Find Deal
dom, mai 26 - sex, mai 31

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 March, where tickets cost $686 on average. On the other hand, the most expensive months are June and July, where the average cost of tickets is $3,871 and $1,216 respectively.

Which airlines provide the cheapest flights from Portland to London?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 3 days, KLM offered the best one-way deal for that route, at $598. KAYAK users also found Portland to London round-trip flights on JetBlue from $627 and on Delta from $719.

Good to know

Low season

November

High season

October

Cheapest flight

$504
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 23% 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 $504 for a one-way ticket and $627 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?

    SkyTeam, Star Alliance, 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 JetBlue?

    The two airlines most popular with KAYAK users for flights from Portland to London are Delta and JetBlue. With an average price for the route of $768 and an overall rating of 8.0, Delta is the most popular choice. JetBlue is also a great choice for the route, with an average price of $919 and an overall rating of 7.6.

  • 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 4 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 10561 reviews
8.0Entertainment
7.9Comfort
7.4Food
8.2Boarding
8.6Crew
Airline reviews

Paid premium for Delta only to be on safe but tired old 767 with ancient cabin in mediocre condition. Poor wifi and horrible inflight entertainment. Hardly a premium experience. Should have flown SW and had fun flight crew and no pretense

6.0 GoodPeter, May 2024SLC - HNL
Read more about Delta reviews

Paid premium for Delta only to be on safe but tired old 767 with ancient cabin in mediocre condition. Poor wifi and horrible inflight entertainment. Hardly a premium experience. Should have flown SW and had fun flight crew and no pretense

Our flight to Zurich was delayed by almost 3 hours, so we missed our next flight. There was no indication it would be delayed this much. We were told the gate had changed and then it apparently took over 2 hours to load the "catering" on the plane. We were not compensated in any way for the trouble.

Rated entertainment as Mediocre as there were major problems with the Infotainment system that took probably a half hour for them to fix.

Your crew could maybe answer the call bell at least one of the times I pressed it. I pressed it first time with 2.5 hours left in our flight bc my partner was hungry and wanted a sandwich. We finally got the sandwich with 40 mins left in the flight.

Half the bathrooms assigned to economy were out of action

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

They were an hour late and they didn’t have my wheelchair for me

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

The 1st class male crew member was very pleasant - the short female with round glasses , maybe in 50’s had no personality- never spoke when delivering my food, drink, & never smiled the whole trip! In fact looked annoyed when the boarding proses was happening- I would never hire this woman - unfriendly . Have never dealt with a crew member like her-

5-hour delay due to storms in Tanoa and airspace restricted by Miami traffic controllers.

Run out of snack choices. Why are the seats not padded for your butt? Are we sitting on blocks of wood or metal for $250-300 a pop? This ain’t spirit. Let’s get it together people

We were told that our flight would be delayed for 90+ minutes because of weather, so we went to get something to eat only to have them randomly start boarding 15 minutes after the announcement, with no warning.

Entertainment... No earphones passed out. Many including me couldn't use the TV. Legroom was good. Crew was indifferent and a bit surly. Free wifi was a nice convenience. Check in desk location was unknown. Gate number on the boarding passes was wrong.

Going through JFK’s security is a mess. The TSA security said no shoes on the bins. So, we place our shoes in the belt and they came out all over the belt. Boarding was delayed and Flight as well.

Safe and on time were the positives. The plane wasn't cleaned before boarding, there was garbage and food on the floor and in the seat pocket. The TV screen was small and the picture fuzzy, audio quality was poor. Seatbelt was fraying and seat did not recline properly. No charging ports near the seats,

Confusing. Delay updates were out of whack At one point it said my flight was 25 hours. Three gate changes and two delays only to change back to original departure time. Gate announcer and on board flight attendant (Alejandro) making the announcements was impossible to understand due to accent and speed of speech. After beverage service the rear flight attendants sat back there on their phones. No refills no checking in, one sweep through for trash collection. Very impersonal. Bring back Coke products

Delayed departure. Delayed after landing pulling into gate. Delay due to sky bridge malfunction

Great. Loved that there was WiFi on flight to keep in touch and excellent service of beverages and snacks.

Business class is great. New airplane, very comfortable, better than some of the major airlines I am used to

Terrible. Flight was cancelled due to the weather in the east and sout east(florida). Did not get any compesation of any kind. According to them, it was not under their control so I lost all the money paid for the 2 fairs from Raleigh, NC to Orlando, Fl.

Backpack should NOT allowed put in the flight bin , only put it under the seat. I can't find space put my carry on luggage!!! and I pay for it ! that was very bad experience

Fantastic. Smooth boarding with an infant. Never experienced it with any other carriers.

This was a flight operated by Lufthansa. See me prior comments, which were meant for this experience. The CSA, Ashley, should be reprimanded if not fired for incompetence, being rude, and very, very slow. She was whispering to other CSAs, blaming my flight change on others, unable to give me a seat assignment, telling me could not help without offering any advice (I travel 200,000 miles a year and am a consultant to the airlines, so I know how this gets done PRETTY DAMN WELL). Then, she gave me literally the worst seat on the airline (yes, there were other seats open) - the one right next to the bathroom that was so bad the other PAX next to me left to move to another seat. My seat kept getting rammed (3x) by the crew with their carts (no turbulence to speak of), other passengers grabbing the seat to get in or out of the bathroom, and listening to the bathroom flush all night.

This was a Lufthansa flight, not United. The CSA at the counter, Ashley, was not only incompetent, but quite rude. Me and two other PAX waited over 7 minutes standing in front of her and another CSA and they ignored us. We joked that we must have accidently taken invisibility pills. She could have at least said "I'll be with you in a moment, I'm currently....". I could go on about how rude she and the other CSAs were (whispering, not communicating with me, blaming the situation on others, etc.). She would not work for me. Then, she gave me literally the worst seat on the plane. the worst. My seat kept getting bumped (rammed twice by the crew with their carts and about every 5 minutes by someone using the bathroom), listening to the bathroom all night, crowded seat, etc.

My seat was broken. WiFi didn’t work. Gate crew at HOU were rude and condescending. Treated all the passengers badly. Bad experience, United.

First flight of the day… MINIMUM FUEL! 15 minute landing delay at HOU due to fog turned into a 2+ hour delay! Rather than circle, they had to divert to another city to refuel! Sat on tarmac at Austin to refuel. We ALL missed our connections! The crew, including pilots, were clueless. Crew was really a mess. At HOU, Untied employees were exceedingly rude to all. It was pitiful.

Food wasn’t very good, old business seating configuration on an old A340

An hour and a half late is UNACCEPTABLE. The negative impact to our family is unconscionable. And for the price we were forced to pay...

Standard flight experience, but there is only power at the seat to row 20 on the aircraft, on my initial check in it did not say that was the case

Not a fan of the diagonal partially enclosed business class seats or how they have to be converted to beds manually by crew. I prefer more isolation and user control for switching to lie flat.

Terrible boarding , Business class seats are sub standard. As usual crew will miss your food too

Just get Economy Plus for international flights, so worth it the extra room, bigger seats…

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.

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.
9/5qui
3 stops
35h 47mPWM-LGW
$504
9/5qui
2 stops
20h 40mPWM-LGW
$573
9/5qui
1 stopKLM
12h 50mPWM-LHR
$598
9/5qui
2 stopsTAP AIR PORTUGAL
27h 59mPWM-LHR
$614
9/5qui
3 stops
29h 50mPWM-LHR
$635
9/5qui
2 stops
14h 34mPWM-LCY
$708
9/5qui
1 stopDelta
14h 25mPWM-LGW
$812
9/5qui
3 stops
26h 24mPWM-SEN
$865
9/30seg
2 stopsTAP AIR PORTUGAL
21h 29mPWM-LGW
$2,033
9/30seg
1 stopKLM
12h 05mPWM-LHR
$3,077

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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.
5/26dom
multi-stopJetBlue
14h 06mPWM-LHR
5/31sex
multi-stopJetBlue
11h 04mLHR-PWM
$1,327
5/26dom
multi-stop
15h 46mPWM-LHR
5/31sex
multi-stop
40h 09mLHR-PWM
$1,688
5/26dom
multi-stop
21h 36mPWM-LHR
5/31sex
multi-stop
31h 04mLHR-PWM
$2,193
5/26dom
multi-stop
13h 35mPWM-LHR
5/31sex
multi-stop
34h 11mLHR-PWM
$2,361
5/26dom
multi-stop
20h 05mPWM-LHR
5/31sex
multi-stop
34h 11mLHR-PWM
$3,085

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Portland - London Flights

Departure:

Portland (PWM)United States

Cabin classes: