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

JetBlue, United Airlines, and Delta are the most popular carriers operating from Portland to London

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 50% 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.

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 December 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.

$316 Cheap Flights from Portland to London in 2025/26

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Find the cheapest flights from Portland, Maine to London

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

9:47 am - 10:00 amPWM-LGW

19h 13m1 stop

2:00 pm - 9:07 amLGW-PWM

24h 07m1 stop

$523Multiple Airlines

Find Deal

Mon, Jan 19 - Thu, Jan 29

9:47 am - 10:00 amPWM-LGW

19h 13m1 stop

2:00 pm - 4:26 pmLGW-PWM

31h 26m2 stops

$544Multiple Airlines

Find Deal

Mon, Jan 19 - Thu, Jan 29

11:29 am - 10:05 amPWM-LGW

41h 36m2 stops

2:00 pm - 9:07 amLGW-PWM

24h 07m1 stop

$567Multiple Airlines

Find Deal

Fri, Jan 23 - Thu, Jan 29

9:47 am - 10:00 amPWM-LGW

19h 13m1 stop

2:00 pm - 10:22 amLGW-PWM

25h 22m1 stop

$581Multiple Airlines

Find Deal

Mon, Jan 19 - Fri, Jan 30

9:47 am - 10:00 amPWM-LGW

19h 13m1 stop

2:00 pm - 10:49 amLGW-PWM

49h 49m2 stops

$585Multiple Airlines

Find Deal

Mon, Jan 19 - Sat, Jan 24

2:35 pm - 6:55 amPWM-LHR

11h 20m1 stop

8:55 am - 12:26 amLHR-PWM

20h 31m2 stops

$598Delta

Find Deal

Wed, Jan 7 - Tue, Jan 13

2:35 pm - 9:40 pmPWM-LHR

26h 05m2 stops

6:40 am - 12:20 amLHR-PWM

22h 40m2 stops

$599Scandinavian Airlines

Find Deal

Thu, Jan 22 - Tue, Jan 27

12:20 pm - 8:45 amPWM-LHR

15h 25m1 stop

11:45 am - 12:20 amLHR-PWM

17h 35m2 stops

$602Delta

Find Deal

Wed, Jan 21 - Mon, Jan 26

6:16 am - 9:20 amPWM-LHR

22h 04m3 stops

6:40 am - 12:20 amLHR-PWM

22h 40m2 stops

$604Scandinavian Airlines

Find Deal

Thu, Jan 22 - Tue, Jan 27

5:30 am - 9:00 amPWM-LHR

22h 30m1 stop

6:30 am - 11:06 pmLHR-PWM

21h 36m2 stops

$627Virgin Atlantic

Find Deal

Fri, Feb 6 - Sun, Feb 15

KLM flights from Portland, Maine to London

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

KLM

Jan 8

PWM2:35 pmPortland

14h 40m

1 stop

LHR10:15 amLondon Heathrow

Jan 12

LHR12:30 pmLondon Heathrow

14h 57m

1 stop

PWM10:27 pmPortland

$655

Find similar

KLM

Jan 23

PWM2:35 pmPortland

14h 50m

2 stops

LHR10:25 amLondon Heathrow

Jan 27

LHR11:45 amLondon Heathrow

17h 35m

2 stops

PWM12:20 amPortland

$690

Find similar

Delta flights from Portland, Maine to London

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

Delta

Jan 7

PWM2:35 pmPortland

11h 20m

1 stop

LHR6:55 amLondon Heathrow

Jan 13

LHR8:55 amLondon Heathrow

20h 31m

2 stops

PWM12:26 amPortland

$598

Find similar

Delta

Jan 21

PWM12:20 pmPortland

15h 25m

1 stop

LHR8:45 amLondon Heathrow

Jan 26

LHR11:45 amLondon Heathrow

17h 35m

2 stops

PWM12:20 amPortland

$602

Find similar

Delta

Jan 5

PWM6:00 amPortland

23h 15m

1 stop

LHR10:15 amLondon Heathrow

Jan 15

LHR12:40 pmLondon Heathrow

15h 42m

1 stop

PWM11:22 pmPortland

$605

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 1/19

9:47 am-10:00 am

1 stop19h 13m

London Gatwick

Thu 1/29

2:00 pm-9:07 am

1 stop24h 07m

$523

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 1/19

9:47 am-10:00 am

1 stop19h 13m

London Gatwick

Thu 1/29

2:00 pm-4:26 pm

2 stops31h 26m

$544

PortlandLondon

PWM - LGW

PWMLGW

Portland

Fri 1/23

11:29 am-10:05 am

2 stops41h 36m

London Gatwick

Thu 1/29

2:00 pm-9:07 am

1 stop24h 07m

$567

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 1/19

9:47 am-10:00 am

1 stop19h 13m

London Gatwick

Fri 1/30

2:00 pm-10:22 am

1 stop25h 22m

$581

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 1/19

9:47 am-10:00 am

1 stop19h 13m

London Gatwick

Sat 1/24

2:00 pm-10:49 am

2 stops49h 49m

$585

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/7

2:35 pm-6:55 am

1 stop11h 20m

London Heathrow

Tue 1/13

8:55 am-12:26 am

2 stops20h 31m

$598

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 1/22

2:35 pm-9:40 pm

2 stops26h 05m

London Heathrow

Tue 1/27

6:40 am-12:20 am

2 stops22h 40m

$599

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/21

12:20 pm-8:45 am

1 stop15h 25m

London Heathrow

Mon 1/26

11:45 am-12:20 am

2 stops17h 35m

$602

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 1/22

6:16 am-9:20 am

3 stops22h 04m

London Heathrow

Tue 1/27

6:40 am-12:20 am

2 stops22h 40m

$604

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 2/6

5:30 am-9:00 am

1 stop22h 30m

London Heathrow

Sun 2/15

6:30 am-11:06 pm

2 stops21h 36m

$627

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 $619, are often lower during this time because this is during the off-season. The month of December is another great option to travel to London, with average flight prices from Portland, Maine averaging around $699.

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 $788. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $936. 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 $827 when looking at flights departing at noon. Flights to London are more costly in the afternoon, with an average ticket price of $869. Departure times in the afternoon 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

Fastest flight time	10h 24m
Direct flights	None

The fastest flight from Portland, Maine to London takes 10h 24m

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

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How far is Portland to London by plane?
London is 3183.1 mi away from Portland. Typically, this will take 10h 20m 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 December 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 United Airlines (42% of total bookings). The next most popular airlines are Delta (30%) and JetBlue (28%).

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 9,065 reviews		Search United Airlines flights
Delta	PriceFrom $825	Free Cancellation	Rating 7.9 8,011 reviews		Search Delta flights

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Crawley

Brentwood

Wembley

Romford

Watford

Ilford

Cobham

Folkestone

Uxbridge

Stansted

Chelmsford

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.