What airlines fly to London?

British Airways, Delta and Virgin Atlantic are the top three most popular airlines that fly to London from Portland, Maine according to our data. British Airways is the first choice among our users, with 51% of people opting to fly with this airline when traveling to London. Keep in mind that there are 18 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Portland to London?

Air Canada, United Airlines, and Scandinavian Airlines are the most popular carriers operating from Portland to London

When did momondo last update prices for flights from Portland Airport to London?

Prices for flights from Portland Airport to London refresh daily.

How many operators does momondo search for flights from Portland Airport to London?

There are 2 operators available for flights from Portland Airport to London as of October 2025.

How old do you have to be to fly from Portland Airport to London?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London.

What documentation or ID do you need to fly to London?

The travel and health documents required for your trip to London can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$281 Cheap Flights from Portland to London in 2025/26

Q: What is the typical price of a round-trip flight between Portland, Maine and London?

Prices are currently low for flights on this route. Typical prices usually range from $619 to $772. The lowest price recently found on this route was $592.

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Find the cheapest flights from Portland, Maine to London

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

1:25 pm - 6:25 amPWM-LHR

12h 00m1 stop

6:20 am - 11:54 pmLHR-PWM

22h 34m2 stops

$592Delta

Find Deal

Tue, Nov 11 - Tue, Nov 18

2:30 pm - 8:05 amPWM-LHR

12h 35m1 stop

4:10 pm - 11:54 pmLHR-PWM

12h 44m1 stop

$600KLM

Find Deal

Tue, Nov 11 - Tue, Nov 18

6:35 am - 9:20 amPWM-LHR

21h 45m2 stops

7:30 pm - 11:54 pmLHR-PWM

33h 24m2 stops

$613Scandinavian Airlines

Find Deal

Fri, Nov 14 - Fri, Nov 21

5:37 pm - 10:25 amPWM-LHR

11h 48m1 stop

7:50 am - 6:10 pmLHR-PWM

15h 20m2 stops

$618American Airlines

Find Deal

Tue, Nov 11 - Tue, Nov 18

12:38 pm - 7:00 amPWM-LHR

13h 22m2 stops

7:50 am - 6:10 pmLHR-PWM

15h 20m2 stops

$622American Airlines

Find Deal

Tue, Nov 11 - Tue, Nov 18

2:34 pm - 6:20 amPWM-LHR

10h 46m1 stop

9:00 am - 11:59 pmLHR-PWM

19h 59m2 stops

$642Delta

Find Deal

Thu, Dec 11 - Tue, Dec 16

6:00 am - 9:20 pmPWM-LHR

10h 20m1 stop

4:00 pm - 11:17 pmLHR-PWM

12h 17m1 stop

$650United Airlines

Find Deal

Tue, Nov 11 - Tue, Nov 18

6:00 am - 9:00 amPWM-LHR

22h 00m1 stop

8:55 am - 10:23 pmLHR-PWM

18h 28m1 stop

$654Virgin Atlantic

Find Deal

Sun, Nov 30 - Sun, Dec 7

6:00 am - 6:30 amPWM-LHR

19h 30m2 stops

11:10 am - 11:09 pmLHR-PWM

16h 59m2 stops

$675United Airlines

Find Deal

Sun, Nov 30 - Sun, Dec 7

6:35 am - 4:00 pmPWM-LHR

28h 25m2 stops

6:40 am - 11:54 pmLHR-PWM

22h 14m3 stops

$779Scandinavian Airlines

Find Deal

Tue, Nov 11 - Tue, Nov 18

Delta flights from Portland, Maine to London

Our best Delta deals on Portland, Maine to London flight tickets

Delta

Nov 11

PWM1:25 pmPortland

12h 00m

1 stop

LHR6:25 amLondon Heathrow

Nov 18

LHR6:20 amLondon Heathrow

22h 34m

2 stops

PWM11:54 pmPortland

$592

Find similar

Delta

Dec 11

PWM2:34 pmPortland

10h 46m

1 stop

LHR6:20 amLondon Heathrow

Dec 16

LHR9:00 amLondon Heathrow

19h 59m

2 stops

PWM11:59 pmPortland

$642

Find similar

Delta

Dec 11

PWM2:34 pmPortland

18h 11m

2 stops

LHR1:45 pmLondon Heathrow

Dec 16

LHR8:55 amLondon Heathrow

20h 04m

2 stops

PWM11:59 pmPortland

$662

Find similar

KLM flights from Portland, Maine to London

Our best KLM deals on Portland, Maine to London flight tickets

KLM

Nov 11

PWM2:30 pmPortland

12h 35m

1 stop

LHR8:05 amLondon Heathrow

Nov 18

LHR4:10 pmLondon Heathrow

12h 44m

1 stop

PWM11:54 pmPortland

$600

Find similar

KLM

Dec 11

PWM4:53 pmPortland

10h 52m

1 stop

LHR8:45 amLondon Heathrow

Dec 16

LHR4:10 pmLondon Heathrow

12h 49m

1 stop

PWM11:59 pmPortland

$649

Find similar

KLM

Mar 9

PWM4:50 pmPortland

11h 55m

1 stop

LHR8:45 amLondon Heathrow

Mar 16

LHR4:10 pmLondon Heathrow

11h 39m

1 stop

PWM11:49 pmPortland

$733

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

1:25 pm-6:25 am

1 stop12h 00m

London Heathrow

Tue 11/18

6:20 am-11:54 pm

2 stops22h 34m

$592

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

2:30 pm-8:05 am

1 stop12h 35m

London Heathrow

Tue 11/18

4:10 pm-11:54 pm

1 stop12h 44m

$600

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 11/14

6:35 am-9:20 am

2 stops21h 45m

London Heathrow

Fri 11/21

7:30 pm-11:54 pm

2 stops33h 24m

$613

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

5:37 pm-10:25 am

1 stop11h 48m

London Heathrow

Tue 11/18

7:50 am-6:10 pm

2 stops15h 20m

$618

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

12:38 pm-7:00 am

2 stops13h 22m

London Heathrow

Tue 11/18

7:50 am-6:10 pm

2 stops15h 20m

$622

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 12/11

2:34 pm-6:20 am

1 stop10h 46m

London Heathrow

Tue 12/16

9:00 am-11:59 pm

2 stops19h 59m

$642

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

6:00 am-9:20 pm

1 stop10h 20m

London Heathrow

Tue 11/18

4:00 pm-11:17 pm

1 stop12h 17m

$650

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 11/30

6:00 am-9:00 am

1 stop22h 00m

London Heathrow

Sun 12/7

8:55 am-10:23 pm

1 stop18h 28m

$654

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 11/30

6:00 am-6:30 am

2 stops19h 30m

London Heathrow

Sun 12/7

11:10 am-11:09 pm

2 stops16h 59m

$675

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

6:35 am-4:00 pm

2 stops28h 25m

London Heathrow

Tue 11/18

6:40 am-11:54 pm

3 stops22h 14m

$779

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Portland, Maine to London

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the typical price of a round-trip flight between Portland, Maine and London?

What is the cheapest month to fly to London?

The cheapest month to fly to London from Portland, Maine is in October. Flight prices, which tend to average around $638, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Portland, Maine averaging around $713.

What is the cheapest day to depart on your flight to London?

The cheapest day to depart from Portland, Maine to London is on a Tuesday. Travelers who choose to depart for London on a Tuesday will often find tickets for as low as $654. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $717. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

What is the cheapest time of day to depart on your flight to London?

Flying to London from Portland, Maine at noon is the least expensive time of day to depart. momondo users have found prices as low as $623 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $690. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Portland, Maine to London

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to London according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Portland, Maine to London (PWM to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland, Maine to London

Direct flights	None

There are no direct flights from Portland, Maine to London. There are no popular flight routes from Portland, Maine to London.

Search flight deals

How far is Portland to London by plane?
London is 3183.1 mi away from Portland. Typically, this will take 9h 40m by plane in normal conditions.
When did momondo last update prices for flights from Portland Airport to London?
Prices for flights from Portland Airport to London refresh daily.
How many operators does momondo search for flights from Portland Airport to London?
There are 2 operators available for flights from Portland Airport to London as of October 2025.
How old do you have to be to fly from Portland Airport to London?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London.
What documentation or ID do you need to fly to London?
The travel and health documents required for your trip to London can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Portland, Maine to London?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Portland, Maine to London is JetBlue (33% of total bookings). The next most popular airlines are Delta (33%) and United Airlines (33%).

Best airlines flying from Portland, Maine to London

Compare and see reviews for airlines that fly from Portland, Maine to London with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $648	Free Cancellation	Rating 7.4 8,982 reviews		Search United Airlines flights
Delta	PriceFrom $825	Free Cancellation	Rating 7.9 7,984 reviews		Search Delta flights

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Slough

Guildford

Dartford

Crawley

Hayes

Brentwood

Chelmsford

Colchester

Folkestone

Romford

Ilford

Cobham

Wembley

Stansted

Watford

Why use momondo?

Why should I use momondo to find a flight deal from Portland to London?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Portland to London for you.

Can I find flights from Portland to London with flexible booking policies on momondo?

Yes. All flights to London from Portland on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Portland to London?

Once all potential Portland to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Portland to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Portland to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.