HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
London

$389+ 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 4/2. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LON
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portland to London with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 December 18, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$760
(Virgin Atlantic)

One-way from

$472
(Netflights)

Popular in

July

Cheapest in

February

Average price

$741
Provider with most accurate pricing for Portland-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-London (LON) flights.
Search Deals
From Portland to London (LON)
Search Deals
One-way flight from Portland to London (LON)
Search Deals
High demand for flights, 24% potential price rise
Search Deals
Best time to find cheap flights, 4% potential price drop
Search Deals
Average for round-trip flights in December 2024
Search Deals

Find flight deals from Portland to London

Best flights from Portland to London
Discover carefully curated flight deals from Portland to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2024.

This Virgin Atlantic deal was found by Cheapflights users on 12/17. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/225:34 amPWM - LHR
1 stop21h 21mVirgin Atlantic
Wed 1/296:30 amLHR - PWM
2 stops22h 21mVirgin Atlantic
Deal found 12/17$760
This KAYAK deal was found by Cheapflights users on 12/18. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/13:02 pmPWM - LHR
2 stops21h 38mScandinavian Airlines
Sat 2/155:00 pmLHR - PWM
2 stops35h 56mScandinavian Airlines
Deal found 12/18$766
This KLM deal was found by Cheapflights users on 12/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/223:02 pmPWM - LHR
1 stop15h 08mKLM
Wed 1/292:30 pmLHR - PWM
1 stop14h 21mKLM
Deal found 12/17$774
This JetBlue deal was found by Cheapflights users on 12/17. 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.
Tue 4/225:35 pmPWM - LHR
1 stop10h 55mJetBlue
Sun 4/277:25 amLHR - PWM
1 stop14h 15mJetBlue
Deal found 12/17$789
This Air Canada deal was found by Cheapflights users on 12/17. 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.
Wed 1/2211:36 amPWM - LHR
3 stops19h 14mAir Canada
Wed 1/296:50 amLHR - PWM
3 stops20h 40mAir Canada
Deal found 12/17$868
This American Airlines deal was found by Cheapflights users on 12/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/15:44 amPWM - LHR
1 stop19h 51mAmerican Airlines
Sat 2/1511:25 amLHR - PWM
2 stops16h 16mAmerican Airlines
Deal found 12/18$879
This Delta deal was found by Cheapflights users on 12/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/13:02 pmPWM - LCY
2 stops17h 13mDelta
Sat 2/1510:00 amLCY - PWM
2 stops18h 55mDelta
Deal found 12/18$914
This United deal was found by Cheapflights users on 12/18. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/183:28 pmPWM - LHR
1 stop10h 47mUnited Airlines
Sat 4/262:05 pmLHR - PWM
2 stops25h 57mUnited Airlines
Deal found 12/18$927
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/2712:06 pmPWM - LGW
1 stop16h 54mMultiple Airlines
Sat 2/111:40 amLGW - PWM
2 stops34h 03mMultiple Airlines
Deal found 12/17$973
This Aeromexico deal was found by Cheapflights users on 12/18. 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 Aeromexico is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/812:50 pmPWM - LGW
2 stops16h 10mAir France
Sun 6/1512:00 pmLGW - PWM
2 stops16h 19mAir France
Deal found 12/18$1,310
This Delta deal was found by Cheapflights users on 12/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/182:35 pmPWM - LHR
1 stop11h 20mDelta
Sat 4/268:10 pmLHR - PWM
1 stop22h 51mDelta
Deal found 12/18$933
This Air Canada deal was found by Cheapflights users on 12/18. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/16:00 amPWM - LHR
2 stops19h 30mMultiple Airlines
Sat 2/159:00 amLHR - PWM
3 stops19h 15mMultiple Airlines
Deal found 12/18$985

Find flights from Portland to London within your budget

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/22

5:34 am-7:55 am

1 stop21h 21m

London Heathrow

Wed 1/29

6:30 am-11:51 pm

2 stops22h 21m

$760

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 2/1

3:02 pm-5:40 pm

2 stops21h 38m

London Heathrow

Sat 2/15

5:00 pm-11:56 pm

2 stops35h 56m

$766

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/22

3:02 pm-11:10 am

1 stop15h 08m

London Heathrow

Wed 1/29

2:30 pm-11:51 pm

1 stop14h 21m

$774

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 4/22

5:35 pm-9:30 am

1 stop10h 55m

London Heathrow

Sun 4/27

7:25 am-4:40 pm

1 stop14h 15m

$789

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/22

11:36 am-11:50 am

3 stops19h 14m

London Heathrow

Wed 1/29

6:50 am-10:30 pm

3 stops20h 40m

$868

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 2/1

5:44 am-6:35 am

1 stop19h 51m

London Heathrow

Sat 2/15

11:25 am-10:41 pm

2 stops16h 16m

$879

PortlandLondon

PWM - LCY

PWMLCY

Portland

Sat 2/1

3:02 pm-1:15 pm

2 stops17h 13m

London City

Sat 2/15

10:00 am-11:55 pm

2 stops18h 55m

$914

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 4/18

3:28 pm-7:15 am

1 stop10h 47m

London Heathrow

Sat 4/26

2:05 pm-11:02 am

2 stops25h 57m

$927

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 4/18

2:35 pm-6:55 am

1 stop11h 20m

London Heathrow

Sat 4/26

8:10 pm-2:01 pm

1 stop22h 51m

$933

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 1/27

12:06 pm-10:00 am

1 stop16h 54m

London Gatwick

Sat 2/1

11:40 am-4:43 pm

2 stops34h 03m

$973

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Showing 1-10 of 18 results
1
2

Compare providers for flights from Portland to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to London in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland, Maine-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland, Maine-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland, Maine-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland, Maine-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland, Maine-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

Travel insights for flights from Portland to London

Get recent, data-driven insights about flights from Portland to London including ideal travel times, pricing trends, and more.

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 $1,135). 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 December 18, 2024.

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.

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 December 18, 2024.
Delta
8.0
Very good
8,604 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very good
8,604 reviews
Delta
8.0
Very good
8,604 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM
7.8
Good
1,349 reviews
Delta
8.0
Very good
8,604 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Virgin Atlantic
7.5
Good
668 reviews
Delta
8.0
Very good
8,604 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

JetBlue
7.4
Good
3,279 reviews
Delta
8.0
Very good
8,604 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Air France
7.4
Good
1,504 reviews
Delta
8.0
Very good
8,604 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 4 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.

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

    Flying on Virgin Atlantic is currently your cheapest option to London, with prices starting at $760. Additional round-trip tickets that might be worth considering are offered by Scandinavian Airlines and KLM, with the lowest prices starting at $766 and $774, respectively. Virgin Atlantic is 11% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 $1,135). 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

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 4 airlines flying from Portland to London

Discover the top 4 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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$602Average$1,167FlexibilityNo cancel feeOn-time71%
DeltaCheapest$650Average$896FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$670Average$750FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$718Average$951FlexibilityNo cancel feeOn-time69%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.