HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
London

$260+ 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 7/25. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LON
juil. 8 — juil. 151
mar. 7/8
mar. 7/15
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 juillet 3, 2025.

Round-trip from

$657
(FlightHub)

One-way from

$260
(Kiwi.com)

Popular in

July

Cheapest in

October

Average price

$1,257
From Portland to London (LON)
Search Deals
One-way flight from Portland to London (LON)
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($244 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

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 juillet 3, 2025.

This FlightHub deal was found by Cheapflights users on 7/2. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 10/16:33 amPWM - LHR
2 stops28h 52mScandinavian Airlines
mer. 10/157:05 amLHR - PWM
2 stops21h 26mScandinavian Airlines
Deal found 7/2$657
This JetBlue deal was found by Cheapflights users on 7/2. 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.
mer. 9/242:17 pmPWM - LHR
1 stop14h 13mJetBlue
jeu. 10/211:55 amLHR - PWM
1 stop15h 07mJetBlue
Deal found 7/2$659
This Delta deal was found by Cheapflights users on 7/3. 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.
mar. 8/122:36 pmPWM - LGW
1 stop14h 24mDelta
mer. 8/2012:00 pmLGW - PWM
1 stop17h 48mDelta
Deal found 7/3$710
This United Airlines deal was found by Cheapflights users on 7/2. 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.
mer. 10/12:25 pmPWM - LHR
1 stop15h 15mUnited Airlines
mer. 10/155:40 pmLHR - PWM
2 stops28h 15mUnited Airlines
Deal found 7/2$730
This Delta deal was found by Cheapflights users on 7/2. 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.
mar. 8/122:36 pmPWM - LHR
1 stop14h 24mDelta
mer. 8/209:00 amLHR - PWM
2 stops20h 48mDelta
Deal found 7/2$745
This KLM deal was found by Cheapflights users on 7/2. 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.
mar. 9/232:41 pmPWM - LHR
1 stop13h 09mKLM
mar. 9/301:05 pmLHR - PWM
1 stop16h 06mKLM
Deal found 7/2$753
This Netflights deal was found by Cheapflights users on 7/3. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 8/176:00 amPWM - LHR
1 stop20h 15mVirgin Atlantic
dim. 8/2411:20 amLHR - PWM
1 stop17h 43mVirgin Atlantic
Deal found 7/3$768
This Air Canada deal was found by Cheapflights users on 7/1. 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.
sam. 11/16:00 amPWM - LHR
2 stops34h 35mAir Canada
jeu. 11/139:00 amLHR - PWM
2 stops43h 17mAir Canada
Deal found 7/1$781
This Kiwi.com deal was found by Cheapflights users on 7/2. 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.
mer. 9/242:21 pmPWM - LGW
2 stops19h 19mMultiple Airlines
jeu. 10/22:00 pmLGW - PWM
1 stop24h 06mMultiple Airlines
Deal found 7/2$783
This Delta deal was found by Cheapflights users on 7/2. 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.
ven. 11/1412:50 pmPWM - LCY
2 stops15h 40mDelta
mar. 11/188:40 amLCY - PWM
2 stops19h 51mDelta
Deal found 7/2$880
This oojo deal was found by Cheapflights users on 7/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/237:09 amPWM - LGW
2 stops21h 46mTurkish Airlines
mar. 9/302:00 pmLGW - PWM
2 stops37h 01mTurkish Airlines
Deal found 7/2$914
This United Airlines deal was found by Cheapflights users on 7/3. 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.
dim. 8/172:08 pmPWM - LCY
2 stops17h 22mMultiple Airlines
dim. 8/247:20 pmLCY - PWM
2 stops29h 09mMultiple Airlines
Deal found 7/3$1,169

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 juillet 3, 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

mer. 10/1

6:33 am-4:25 pm

2 stops28h 52m

London Heathrow

mer. 10/15

7:05 am-11:31 pm

2 stops21h 26m

$657

PortlandLondon

PWM - LHR

PWMLHR

Portland

mer. 9/24

2:17 pm-9:30 am

1 stop14h 13m

London Heathrow

jeu. 10/2

11:55 am-10:02 pm

1 stop15h 07m

$659

PortlandLondon

PWM - LGW

PWMLGW

Portland

mar. 8/12

2:36 pm-10:00 am

1 stop14h 24m

London Gatwick

mer. 8/20

12:00 pm-12:48 am

1 stop17h 48m

$710

PortlandLondon

PWM - LHR

PWMLHR

Portland

mer. 10/1

2:25 pm-10:40 am

1 stop15h 15m

London Heathrow

mer. 10/15

5:40 pm-4:55 pm

2 stops28h 15m

$730

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 8/12

2:36 pm-10:00 am

1 stop14h 24m

London Heathrow

mer. 8/20

9:00 am-12:48 am

2 stops20h 48m

$745

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 9/23

2:41 pm-8:50 am

1 stop13h 09m

London Heathrow

mar. 9/30

1:05 pm-12:11 am

1 stop16h 06m

$753

PortlandLondon

PWM - LHR

PWMLHR

Portland

sam. 11/1

6:00 am-8:35 pm

2 stops34h 35m

London Heathrow

jeu. 11/13

9:00 am-11:17 pm

2 stops43h 17m

$781

PortlandLondon

PWM - LGW

PWMLGW

Portland

mer. 9/24

2:21 pm-2:40 pm

2 stops19h 19m

London Gatwick

jeu. 10/2

2:00 pm-9:06 am

1 stop24h 06m

$783

PortlandLondon

PWM - LGW

PWMLGW

Portland

mar. 9/23

7:09 am-9:55 am

2 stops21h 46m

London Gatwick

mar. 9/30

2:00 pm-10:01 pm

2 stops37h 01m

$914

PortlandLondon

PWM - LCY

PWMLCY

Portland

dim. 8/17

2:08 pm-12:30 pm

2 stops17h 22m

London City

dim. 8/24

7:20 pm-7:29 pm

2 stops29h 09m

$1,169

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 21 results
1
2
3

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 $1,098). 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 juillet 3, 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.

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 juillet 3, 2025.
Get a feel of what it's like to fly with Delta, United Airlines, and Virgin Atlantic 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
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

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
7,970 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

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
8,845 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

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!
Virgin Atlantic
7.4
Good
654 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

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
7.3
Good
2,916 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

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!
Turkish Airlines
7.3
Good
3,895 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

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.

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

    Flying on Scandinavian Airlines is currently your cheapest option to London, with prices starting at $657. Additional round-trip tickets that might be worth considering are offered by JetBlue and Delta, with the lowest prices starting at $659 and $710, respectively. Scandinavian Airlines is 23% 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 JetBlue, which is currently one of the cheapest options available, starting at $444. Air Canada flights start at $514 while deals on Delta start at $518 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 $1,098). 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 Portland?

Book flights to Portland if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Canterbury
Harrow
Dover
Gatwick
Orpington
Watford
Croydon
Folkestone
Borehamwood
Aylesbury
Chelmsford
Brentwood
Chichester
Arundel
Milton Keynes
Bishop's Stortford
Dartford

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 juillet 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$586Average$678FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$665Average$831FlexibilityNo cancel feeOn-time69%
DeltaCheapest$825Average$963FlexibilityNo cancel feeOn-timeN/A

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.