What airlines fly to London?

British Airways, Delta and Iberia 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 53% 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?

JetBlue, Air Canada, and United 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 January 2026.

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.

$298 Cheap Flights from Portland to London in 2026

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Find the cheapest flights from Portland, Maine to London

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:29 pm - 6:35 am

PWM

LHR

13h 06m

1 stop

7:50 am - 6:11 pm

LHR

PWM

15h 21m

2 stops

$628American Airlines

Fri, Feb 27 - Tue, Mar 3

2:35 pm - 10:15 am

PWM

LHR

14h 40m

1 stop

11:45 am - 11:59 pm

LHR

PWM

16h 14m

2 stops

$634Delta

Mon, Mar 2 - Mon, Mar 9

6:30 am - 8:00 am

PWM

LHR

20h 30m

2 stops

6:30 am - 11:59 pm

LHR

PWM

21h 29m

2 stops

$639Delta

Mon, Mar 2 - Mon, Mar 9

2:30 pm - 8:50 am

PWM

LHR

13h 20m

1 stop

9:55 am - 12:46 am

LHR

PWM

19h 51m

2 stops

$649Delta

Tue, Mar 31 - Tue, Apr 14

12:51 pm - 7:10 am

PWM

LHR

13h 19m

1 stop

9:55 am - 12:46 am

LHR

PWM

19h 51m

2 stops

$650Delta

Tue, Mar 31 - Tue, Apr 14

12:29 pm - 6:35 am

PWM

LHR

13h 06m

1 stop

1:10 pm - 10:59 pm

LHR

PWM

14h 49m

1 stop

$659Multiple Airlines

Fri, Feb 27 - Tue, Mar 3

5:30 am - 10:40 am

PWM

LHR

24h 10m

1 stop

5:50 pm - 6:23 pm

LHR

PWM

29h 33m

2 stops

$662United Airlines

Wed, May 6 - Mon, May 11

6:00 am - 10:00 am

PWM

LHR

23h 00m

2 stops

5:50 pm - 6:23 pm

LHR

PWM

29h 33m

2 stops

$665United Airlines

Wed, May 6 - Mon, May 11

2:18 pm - 10:25 pm

PWM

LGW

27h 07m

2 stops

5:35 pm - 11:36 pm

LGW

PWM

35h 01m

2 stops

$834Turkish Airlines

Wed, May 6 - Mon, May 11

2:18 pm - 4:40 pm

PWM

LGW

21h 22m

2 stops

5:35 pm - 11:36 pm

LGW

PWM

35h 01m

2 stops

$835Turkish Airlines

Wed, May 6 - Mon, May 11

JetBlue flights from Portland, Maine to London

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

JetBlue

Mar 31

PWM6:00 amPortland

9h 45m

1 stop

LHR8:45 pmLondon Heathrow

Apr 14

LHR8:15 amLondon Heathrow

19h 44m

1 stop

PWM10:59 pmPortland

$677

JetBlue

May 6

PWM6:00 amPortland

9h 45m

1 stop

LHR8:45 pmLondon Heathrow

May 11

LHR8:15 amLondon Heathrow

20h 21m

1 stop

PWM11:36 pmPortland

$693

United Airlines flights from Portland, Maine to London

Our best United Airlines deals on Portland, Maine to London flight tickets

United Airlines

Mar 31

PWM7:12 pmPortland

10h 13m

1 stop

LHR10:25 amLondon Heathrow

Apr 14

LHR6:55 amLondon Heathrow

32h 27m

2 stops

PWM10:22 amPortland

$650

United Airlines

May 6

PWM5:30 amPortland

24h 10m

1 stop

LHR10:40 amLondon Heathrow

May 11

LHR5:50 pmLondon Heathrow

29h 33m

2 stops

PWM6:23 pmPortland

$662

United Airlines

May 6

PWM6:00 amPortland

23h 00m

2 stops

LHR10:00 amLondon Heathrow

May 11

LHR5:50 pmLondon Heathrow

29h 33m

2 stops

PWM6:23 pmPortland

$665

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 2/27

12:29 pm-6:35 am

1 stop13h 06m

London Heathrow

Tue 3/3

7:50 am-6:11 pm

2 stops15h 21m

$628

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 3/2

2:35 pm-10:15 am

1 stop14h 40m

London Heathrow

Mon 3/9

11:45 am-11:59 pm

2 stops16h 14m

$634

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 3/2

6:30 am-8:00 am

2 stops20h 30m

London Heathrow

Mon 3/9

6:30 am-11:59 pm

2 stops21h 29m

$639

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 3/31

2:30 pm-8:50 am

1 stop13h 20m

London Heathrow

Tue 4/14

9:55 am-12:46 am

2 stops19h 51m

$649

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 3/31

12:51 pm-7:10 am

1 stop13h 19m

London Heathrow

Tue 4/14

9:55 am-12:46 am

2 stops19h 51m

$650

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 2/27

12:29 pm-6:35 am

1 stop13h 06m

London Heathrow

Tue 3/3

1:10 pm-10:59 pm

1 stop14h 49m

$659

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/6

5:30 am-10:40 am

1 stop24h 10m

London Heathrow

Mon 5/11

5:50 pm-6:23 pm

2 stops29h 33m

$662

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/6

6:00 am-10:00 am

2 stops23h 00m

London Heathrow

Mon 5/11

5:50 pm-6:23 pm

2 stops29h 33m

$665

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 5/6

2:18 pm-10:25 pm

2 stops27h 07m

London Gatwick

Mon 5/11

5:35 pm-11:36 pm

2 stops35h 01m

$834

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 5/6

2:18 pm-4:40 pm

2 stops21h 22m

London Gatwick

Mon 5/11

5:35 pm-11:36 pm

2 stops35h 01m

$835

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 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 $599, 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 $673.

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

Fastest flight time	10h 15m
Direct flights	None

The fastest flight from Portland, Maine to London takes 10h 15m

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 10h 15m 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 January 2026.
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 United Airlines (35% of total bookings). The next most popular airlines are Delta (28%), JetBlue (19%), and American Airlines (18%).

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 9,215 reviews		Search United Airlines flights
Delta	PriceFrom $765	Free Cancellation	Rating 7.9 8,123 reviews		Search Delta flights

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Slough

Guildford

Crawley

Wembley

Dartford

Hayes

Brentwood

Harrow

Watford

Cobham

Folkestone

Romford

Stansted

Croydon

Richmond

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.