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$558+ Cheap flights from Portland, ME (PWM) to London (LON)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/21. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LON
ago. 25 — sep. 11
lun. 8/25
lun. 9/1
1 adult, Economy
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Cheap flight deals from Portland to London

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated agosto 20, 2025.

Round-trip from

$672
(Expedia)

One-way from

$558
(Travelocity)

Popular in

July

Cheapest in

October

Average price

$797
From Portland to London (LON)
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One-way flight from Portland to London (LON)
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Highest demand for flights based on searches. 17% potential increase in price ($186 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Portland to London

Cheapest flights from Portland to London
Explore the most affordable flight options available from Portland to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 20, 2025.

This Expedia deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/42:17 pmPWM - LHR
1 stop25h 28mJetBlue
sáb. 10/118:15 amLHR - PWM
1 stop18h 47mJetBlue
Deal found 8/20$672
This Expedia deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/32:17 pmPWM - LHR
1 stop14h 13mJetBlue
vie. 10/1011:55 amLHR - PWM
1 stop30h 27mJetBlue
Deal found 8/19$691
This Expedia deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/122:17 pmPWM - LHR
1 stop14h 13mJetBlue
dom. 9/218:15 amLHR - PWM
1 stop18h 52mJetBlue
Deal found 8/19$701
This Expedia deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/157:09 amPWM - LHR
1 stop21h 21mJetBlue
lun. 9/228:15 amLHR - PWM
1 stop18h 52mJetBlue
Deal found 8/18$732
This Gurufare deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/132:17 pmPWM - LHR
1 stop25h 28mJetBlue
dom. 9/218:15 amLHR - PWM
1 stop18h 52mJetBlue
Deal found 8/19$733
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/102:14 pmPWM - LHR
1 stop11h 41mUnited Airlines
mié. 9/171:30 pmLHR - PWM
2 stops14h 33mUnited Airlines
Deal found 8/20$739
This American Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/102:30 pmPWM - LHR
1 stop14h 50mAmerican Airlines
mié. 9/1710:05 amLHR - PWM
1 stop13h 06mAmerican Airlines
Deal found 8/20$751
This Air Canada deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/97:30 amPWM - LHR
2 stops18h 00mAir Canada
dom. 9/2112:40 pmLHR - PWM
2 stops34h 46mAir Canada
Deal found 8/19$778
This JetBlue deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/102:17 pmPWM - LHR
1 stop14h 13mJetBlue
dom. 9/2111:55 amLHR - PWM
1 stop15h 12mJetBlue
Deal found 8/19$779
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/172:14 pmPWM - LHR
1 stop11h 41mUnited Airlines
mié. 9/241:30 pmLHR - PWM
2 stops14h 33mUnited Airlines
Deal found 8/20$780
This Air Canada deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/1310:39 amPWM - LHR
2 stops38h 51mAir Canada
dom. 9/212:05 pmLHR - PWM
2 stops28h 17mAir Canada
Deal found 8/19$784
This Booking.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/36:00 amPWM - LHR
2 stops22h 35mAir Canada
vie. 10/105:40 pmLHR - PWM
2 stops29h 58mAir Canada
Deal found 8/19$785

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated agosto 20, 2025.
Use the filters below to find and compare flights from Portland to London that are best for you.

Fly from

Portland

Fly to

London

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

sáb. 10/4

2:17 pm-8:45 pm

1 stop25h 28m

London Heathrow

sáb. 10/11

8:15 am-10:02 pm

1 stop18h 47m

$672

PortlandLondon

PWM - LHR

PWMLHR

Portland

vie. 10/3

2:17 pm-9:30 am

1 stop14h 13m

London Heathrow

vie. 10/10

11:55 am-1:22 pm

1 stop30h 27m

$691

PortlandLondon

PWM - LHR

PWMLHR

Portland

vie. 9/12

2:17 pm-9:30 am

1 stop14h 13m

London Heathrow

dom. 9/21

8:15 am-10:07 pm

1 stop18h 52m

$701

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 1/6

6:00 am-8:35 pm

2 stops33h 35m

London Heathrow

lun. 1/12

2:50 pm-4:48 pm

2 stops30h 58m

$724

PortlandLondon

PWM - LHR

PWMLHR

Portland

lun. 9/15

7:09 am-9:30 am

1 stop21h 21m

London Heathrow

lun. 9/22

8:15 am-10:07 pm

1 stop18h 52m

$732

PortlandLondon

PWM - LHR

PWMLHR

Portland

sáb. 9/13

2:17 pm-8:45 pm

1 stop25h 28m

London Heathrow

dom. 9/21

8:15 am-10:07 pm

1 stop18h 52m

$733

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 9/10

10:39 am-6:30 am

2 stops14h 51m

London Heathrow

mié. 9/17

1:30 pm-11:03 pm

2 stops14h 33m

$739

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 1/6

11:17 am-6:20 am

1 stop14h 03m

London Heathrow

lun. 1/12

7:25 pm-4:48 pm

2 stops26h 23m

$739

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 9/10

2:30 pm-10:20 am

1 stop14h 50m

London Heathrow

mié. 9/17

10:05 am-6:11 pm

1 stop13h 06m

$751

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 9/10

10:39 am-8:35 am

2 stops16h 56m

London Heathrow

dom. 9/21

9:30 am-1:22 pm

2 stops32h 52m

$778

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 37 results
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Best time to book a flight from Portland to London

Have a flexible travel schedule? Discover the best time to fly to London from Portland with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from Portland, Maine to London?

Currently, November is the cheapest month in which you can book a flight from Portland, Maine to London (average of $661). Flying from Portland, Maine to London in June is currently the most expensive (average of $1,097). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PWM to LON?

Find hourly flight availability from Portland to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated agosto 20, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 5% on flights from Portland, Maine to London by exploring options for tickets at noon.

How much does it cost to fly round-trip from Portland, Maine to London?

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated agosto 20, 2025.
Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from Portland to London by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,982 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,928 reviews
Delta
8.0
Very good
7,982 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,982 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
JetBlue
7.2
Good
2,916 reviews
Delta
8.0
Very good
7,982 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Portland to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Portland to London?

    Portland (PWM) is the airport you will fly out of if you book a flight from Portland to London. You should not have trouble finding flights to London from Portland; the airport handles an average of 0 outbound flights to London per day. You should also have plenty of airline options to choose from since 3 airlines have flights from the Portland airport to London. It is only a 2.9 mi journey to Portland (PWM) from Portland’s city center.

  • How long is the flight from Portland, Maine to London?

    There are many flights that can get you from Portland, Maine to London in 13h 55m. Fly via JetBlue, Delta, or Turkish Airlines to get the fastest option. There are 3193 mi between Portland, Maine and London. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Portland, Maine to London round-trip?

    Flying on JetBlue is currently your cheapest option to London, with prices starting at $586. Additional round-trip tickets that might be worth considering are offered by United Airlines and Delta, with the lowest prices starting at $648 and $825, respectively. JetBlue is 32% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Portland, Maine to London one-way?

    To fly one-way, consider booking your trip with Air Canada, which is currently one of the cheapest options available, starting at $558. KLM flights start at $564 while deals on JetBlue start at $574 one-way.

  • What are the most popular routes from Portland, Maine to London?

    Most travelers choose Portland - London Heathrow, Portland - London Gatwick or Portland - London City when deciding on the best route from Portland, Maine to London.

  • Can I find deals for flights from Portland to London that include hotel bookings?

    Yes. In addition to deals on Portland to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to London.

  • Can I find deals for business class flights from Portland to London?

    Yes. Cheapflights offers flight deals from Portland to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, November is the cheapest month in which you can book a flight from Portland, Maine to London (average of $661). Flying from Portland, Maine to London in June is currently the most expensive (average of $1,097). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Southend-on-Sea
Harrow
Canterbury
Croydon
Dartford
Dover
Orpington
Gatwick
Borehamwood
Aylesbury
Chelmsford
Bedford
Folkestone
Chichester
Arundel
Eastbourne
Milton Keynes

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 3 airlines flying from Portland to London

Discover the top 3 airlines that operate flights from Portland to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated agosto 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$586Average$678FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$648Average$789FlexibilityNo cancel feeOn-time69%
DeltaCheapest$825Average$963FlexibilityNo cancel feeOn-timeN/A

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