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PWM - LON

$587 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 5/17. 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
vie. 6/7
vie. 6/14

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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 43,968,530 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
$626JetBlue
Find Deal
mar., oct. 8 - mar., oct. 22
1:10 pm - 9:30 amPWM-LHR
15h 20m1 stop
11:55 am - 9:28 pmLHR-PWM
14h 33m1 stop
$629JetBlue
Find Deal
mar., sep. 24 - mar., oct. 1
6:07 am - 7:45 amPWM-LHR
20h 38m1 stop
9:50 am - 8:57 pmLHR-PWM
16h 07m2 stops
$719American Airlines
Find Deal
mar., sep. 24 - mar., oct. 1
4:17 pm - 10:20 amPWM-LHR
13h 03m2 stops
9:50 am - 8:57 pmLHR-PWM
16h 07m2 stops
$721American Airlines
Find Deal
mar., sep. 24 - mar., oct. 1
5:30 pm - 10:00 amPWM-LGW
11h 30m1 stop
12:00 pm - 11:06 pmLGW-PWM
16h 06m2 stops
$761Delta
Find Deal
lun., sep. 9 - mar., sep. 24
2:51 pm - 10:00 amPWM-LGW
14h 09m1 stop
12:00 pm - 11:57 pmLGW-PWM
16h 57m1 stop
$769KLM
Find Deal
dom., may. 19 - dom., may. 26
7:25 pm - 10:40 amPWM-LHR
10h 15m1 stop
6:50 am - 6:34 pmLHR-PWM
16h 44m2 stops
$774United Airlines
Find Deal
lun., sep. 9 - mar., sep. 24
2:35 pm - 10:00 amPWM-LGW
14h 25m1 stop
12:00 pm - 11:06 pmLGW-PWM
16h 06m2 stops
$778Delta
Find Deal
mar., oct. 8 - mar., oct. 22
3:55 pm - 10:40 amPWM-LHR
13h 45m2 stops
6:50 am - 6:34 pmLHR-PWM
16h 44m2 stops
$778United Airlines
Find Deal
lun., sep. 9 - mar., sep. 24
2:51 pm - 8:05 amPWM-LHR
12h 14m1 stop
10:50 am - 11:57 pmLHR-PWM
18h 07m1 stop
$805KLM
Find Deal
dom., may. 19 - dom., may. 26

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, JetBlue offered the best one-way deal for that route, at $587. KAYAK users also found Portland to London round-trip flights on JetBlue from $626 and on American Airlines from $719.

Good to know

Low season

November

High season

October

Cheapest flight

$587
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 $587 for a one-way ticket and $626 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 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 $926 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 10789 reviews
8.0Entertainment
8.6Crew
8.2Boarding
7.9Comfort
7.4Food
Airline reviews

West Jet has a horrible boarding process and the seats have no cushion.

4.0 OkayDouglas, May 2024MSP - YEG
Read more about Delta reviews

West Jet has a horrible boarding process and the seats have no cushion.

Everything went smoothly. I didn’t like that when I booked in the main cabin my wife and I weren’t seated together. One would think when booking on an option that allows picking your seat. They would put you and your travel partner together. Had to call to get it sorted. They did fix.

The gate area was incredibly short staffed, with one representative manning 4-5 flights, which caused a 3 hr delay in boarding even though the plane was all ready to leave. Other flights also were delayed because of this. The flight crew was awesome and I feel bad for the only gate worker on call, but Delta needs to hire more employees.

Very frustrated with boarding gate crew. She announced the plane was small and they would be limiting us to one item to carry on. Not a problem for me as I understand the tiny planes have limited space!! Not the case here! It was a rather large plane and had plenty of room for bags! So because I don’t want to be one of “those people” who ignores the request to check a carry on I did so asking if I would be able to pick it up at the bottom of the ramp on arrival in Knoxville to which she responded “yes”! Then I watched as every other passenger held onto their 2 items and boarded!! Then when we arrived in Knoxville our 2 carry ons had been put with all the other luggage and we had to go to baggage pick up and wait for all the big checked bags to come off the carousel! So she lied!! Frustrating. Next time I won’t be so nice!

It was a good experience except when boarding a female flight attendant did not go out of her way to assist my teenage daughters in finding space for their carry-ons after their compartments were full.

On time departure, smooth trip, flight attendant told through passengers the gate we would arrive at and the gate our outbound flight was departing from. Early arrival

Checking in at the airport the agent only booked the first keg of my trip and had my checked luggage going to the airport with a layover! Never was issued a boarding pass for the second leg or received sticker fir my checked bag. All was well in the end! Delta agents helped to resolve the situation!!!

Delayed due to an ill passenger after loading. Not preventable on Delta's part. Was in first class. The seats are becoming worn and detaching from their velcro attachments. Only got snacks on flight. The attendant was not the friendliest.

I would fly again the whole experience was great. The only feed back I can give that they don't do that American Airlines does is the crew there is more humorous with boarding and thank their passengers. It makes it more fun to fly with them. I would however fly Delta again.

Big plane, long flight, absolutely no leg room and basically non existent air! I am 5”4’ and always travel Main Cabin, I was miserable on this plane and could barely move when we arrived in Cabo due to the cramped leg area!

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.

great flight. Pilot was communicative, flight attendants were excellent. Really nice experience except my tv didn’t work.

Overall, the flight was better than the flight I took to go to Florida, which had a bunch of problems. The crew is really nice and the plane was new so it had a small problem when we were on the runway, but the flight itself was great. They even made some time back up, which is always a good thing.

at the time for boarding the lady just call Group A and no other goups and everybody from A to F go inside without the right turn,and when we get in theres no more spsce for carry on , the ones that get in at not correct group from the back occupy our space !!!!! a mess !!!!

There were multiple delays but JetBlue tried to make the boarding and departure process as quick and efficient as possible. The crew was as detached from reality as could be, meaning: not very friendly and just doing things by the numbers.

I had back trouble prior to my flight and everyone was great about helping me.

Jetblue needs to improve on Onboarding as it seems to always be behind on departing. It never leaves on time. I would recommend to have an earlier Onboarding in order to leave on time and respect your customers time as well.

40 minute delay before take off after boarding flight. Bright lights throughout night flight due Issues with light panels. In flight Entertainment nonfunctional

Flight was delayed 2.5 hours - a big deal on an overnight when you plan to sleep.

I feel like they have upgraded the app since I last flew United and I found it to be super helpful. I had stopped flying United unless absolutely necessary and my experience on this trip indicates they have been working hard to improve their services.

Surprisingly easy! I was hesitant to try this, but the cost swayed me. I actually felt like I had less stress than all the taxiing and possible delays that occur with short regional flights where you spend less time in the air than getting to and from the plane..

This flight was delayed multiple times and eventually canceled around 2-3ish. Original take off time was around 10:30am. By 3, there were no other options out of Houston, so stuck in Houston for from 3pm - 11am the next day.

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

The plane was dirty and the in seat air wasn't blowing as planes usually do.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

All flights were on time and boarding was issue free

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.
5/17vie.
1 stopJetBlue
12h 36mPWM-LGW
$587
5/17vie.
1 stopJetBlue
14h 11mPWM-LHR
$587
5/17vie.
3 stops
35h 10mPWM-LGW
$655
5/17vie.
2 stopsAir Canada
43h 25mPWM-LHR
$670
5/17vie.
2 stops
42h 55mPWM-LGW
$719
5/17vie.
2 stopsDelta
15h 49mPWM-LCY
$934
5/17vie.
3 stops
54h 45mPWM-LHR
$934
5/17vie.
3 stops
46h 15mPWM-LCY
$955
5/17vie.
3 stops
43h 46mPWM-SEN
$1,755

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Portland - London Flights

Departure:

Portland (undefined)United States

Cabin classes: