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PWM - LHR

$578 Find cheap flights from Portland to London Heathrow Airport

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 6/2. 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
Do 6/13
Do 6/20

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

 
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 41,771,603 times on KAYAK, and here is why:

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

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
1:06 pm - 9:30 amPWM-LHR
15h 24m1 stop
11:55 am - 9:29 pmLHR-PWM
14h 34m1 stop
$628JetBlue
Find Deal
Di, Sep 24 - Di, Okt 1
5:55 pm - 11:15 amPWM-LHR
12h 20m1 stop
9:50 am - 10:14 pmLHR-PWM
17h 24m2 stops
$718American Airlines
Find Deal
Mi, Sep 25 - Di, Okt 8
7:22 pm - 8:50 pmPWM-LHR
20h 28m1 stop
12:05 pm - 11:11 pmLHR-PWM
16h 06m2 stops
$732United Airlines
Find Deal
Mo, Nov 4 - Mi, Nov 13
2:35 pm - 6:45 amPWM-LHR
11h 10m1 stop
6:50 am - 11:59 pmLHR-PWM
22h 09m2 stops
$740United Airlines
Find Deal
Di, Sep 24 - Di, Okt 1
12:28 pm - 10:00 amPWM-LHR
16h 32m3 stops
2:05 pm - 11:59 pmLHR-PWM
14h 54m2 stops
Mi, Sep 25 - Di, Okt 8
12:28 pm - 10:00 amPWM-LHR
16h 32m3 stops
6:00 pm - 2:23 pmLHR-PWM
25h 23m3 stops
$800Air Canada
Find Deal
Mi, Sep 25 - Di, Okt 8
11:26 am - 11:20 amPWM-LHR
18h 54m3 stops
1:25 pm - 11:48 pmLHR-PWM
15h 23m2 stops
Mo, Nov 4 - Mi, Nov 13
11:26 am - 11:20 amPWM-LHR
18h 54m3 stops
6:00 pm - 10:48 amLHR-PWM
21h 48m3 stops
$825Air Canada
Find Deal
Mo, Nov 4 - Mi, Nov 13
5:30 am - 6:45 amPWM-LHR
20h 15m1 stop
9:00 am - 11:39 pmLHR-PWM
19h 39m2 stops
$900Delta
Find Deal
Di, Aug 6 - Di, Aug 13
12:55 pm - 9:25 amPWM-LHR
15h 30m2 stops
11:30 am - 11:39 pmLHR-PWM
17h 09m2 stops
$904Delta
Find Deal
Di, Aug 6 - Di, Aug 13

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.

Which airlines provide the cheapest flights from Portland to London Heathrow Airport?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 3 days, TAP AIR PORTUGAL offered the best one-way deal for that route, at $743. KAYAK users also found Portland to London Heathrow Airport round-trip flights on JetBlue from $628 and on American Airlines from $718.

Good to know

Low season

December

High season

May

Cheapest flight

$578
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Portland to London Heathrow 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 Portland to London Heathrow Airport flights

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

    In the last 3 days, the lowest price for a flight from Portland, Maine to London Heathrow Airport was $578 for a one-way ticket and $628 for a round-trip.

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

    Yes

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

    When flying out of Portland you will be using Portland. You will be landing at London Heathrow Airport, also known as London Heathrow.

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

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

  • Which airline alliances offer flights from Portland to London Heathrow Airport?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Portland and London Heathrow Airport, 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 $896 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 $896 and an overall rating of 7.4.

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

    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 Heathrow Airport.

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

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

    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 Heathrow Airport with an airline and back to Portland with another airline. Booking your flights between Portland and LHR can sometimes prove cheaper using this method.

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

    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 Heathrow Airport 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 10736 reviews
8.6Crew
7.9Comfort
8.2Boarding
8.0Entertainment
7.4Food
Airline reviews

Absolutely nothing flight was cancelled and delayed for 2 days. Barely a heads up I want a full refund

2.0 MediocreDevan, May 2024AUS - BOS
Read more about Delta reviews

Absolutely nothing flight was cancelled and delayed for 2 days. Barely a heads up I want a full refund

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

Best airline! Always friendly and welcoming. Skyclub was great and loved the fast free wifi on board. I also love that you can pre-order your meal on the app!

Atlanta boarding crew at gate were filled with arrogance and were disrespectful. In flight crew showed indifference to the needs of passengers. This is about the flight from ATL to BDL.

The plane was FREEZING SEATS UNCOMFORTABLE Otherwise smooth Thank you

Boarding was chaotic. I didn’t finish dinner because I went to bed early. Breakfast omelet was overcooked and tasteless but croissant was better than usual. Plane was dirty—crumbs in every seam and lavatory was poorly maintained (paint peeling, etc.) and toilet paper had not been refreshed before takeoff. No cubby for storage in first and seat was narrow.

Boarding was somewhat chaotic. Unable to evaluate crew or food/drink because captain kept them seated due to turbulence. Have no idea if entertainment was offered.

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.

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.

No lounge access with “United First” ticket. False alarm about late flight, jeopardizing connection. Wrong meal. Loose power socket would not hold plug, could not charge device. In-flight access to text messaging did not work. Toilet seat on plane would not stay up.

We ended up with seats in the very back. So they did not recline. Have no idea why, we reserved and checked in very early. The isles were very narrow and the seats had very little leg room. But they did give us water, and a snack.

Energetic crew - flight full of swiftied going to Taylor's opening show in Paris! Long lines for bathroom made out kind of suck though

Check in etc was very good. As for on the plane, it was like flying in a freezer. It was so cold, i have flown for years and never been so cold on a plane. Staff on board said its always cold when flying which is a load of rubbish. They wouldnt put any heating on and now i have the flu because of this .

I’ve had a couple flights this week on United that were delayed by an hour or more

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.

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.
6/2So
3 stops
53h 15mPWM-LHR
$578
5/31Fr
3 stops
53h 45mPWM-LHR
$611
6/1Sa
2 stopsTAP AIR PORTUGAL
38h 56mPWM-LHR
$743
5/31Fr
1 stopJetBlue
14h 06mPWM-LHR
$759
6/2So
2 stopsUnited Airlines
20h 00mPWM-LHR
$765
6/1Sa
2 stopsTAP AIR PORTUGAL
27h 31mPWM-LHR
$836
6/2So
1 stopJetBlue
14h 06mPWM-LHR
$858
5/31Fr
2 stopsUnited Airlines
19h 45mPWM-LHR
$865
6/2So
1 stopDelta
14h 48mPWM-LHR
$890
6/2So
2 stopsDelta
14h 39mPWM-LHR
$910

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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.
5/16Do
multi-stopDelta
19h 50mPWM-LHR
5/23Do
multi-stopDelta
20h 04mLHR-PWM
$800
5/16Do
multi-stopDelta
10h 54mPWM-LHR
5/23Do
multi-stopDelta
20h 37mLHR-PWM
$804
5/16Do
multi-stopDelta
21h 15mPWM-LHR
5/23Do
multi-stopDelta
18h 49mLHR-PWM
$805
5/18Sa
multi-stopDelta
15h 19mPWM-LHR
5/25Sa
multi-stopDelta
20h 04mLHR-PWM
$850
5/18Sa
multi-stopKLM
12h 14mPWM-LHR
5/25Sa
multi-stopKLM
18h 07mLHR-PWM
$854
5/18Sa
multi-stopUnited Airlines
19h 25mPWM-LHR
5/25Sa
multi-stopUnited Airlines
17h 36mLHR-PWM
$859
5/18Sa
multi-stop
19h 25mPWM-LHR
5/25Sa
multi-stop
13h 56mLHR-PWM
$1,848
5/16Do
multi-stop
15h 23mPWM-LHR
5/23Do
multi-stop
20h 06mLHR-PWM
$1,991
5/16Do
multi-stopAir Canada
17h 15mPWM-LHR
5/23Do
multi-stopAir Canada
20h 06mLHR-PWM
$2,700

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Portland - London Heathrow Airport Flights

Departure:

Portland (undefined)United States

Destination:

London Heathrow Airport (LHR)United Kingdom

Return flight deals:

London Heathrow Airport - Portland

Cabin classes: