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

JetBlue, Delta, and Air Canada are the most popular carriers operating from Portland to London

What airlines fly to London?

British Airways, Delta and American Airlines 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 47% of people opting to fly with this airline when traveling to London. Keep in mind that there are 17 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 is 1 operator available for flights from Portland Airport to London as of August 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.

$329 Cheap Flights from Portland, Maine to London in 2026

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Find the cheapest flights from Portland, Maine to London

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:17 am - 9:10 amPWM Portland-LHR London Heathrow

16h 53m1 stop Newark

6:50 am - 10:57 pmLHR London Heathrow-PWM Portland

21h 07m2 stops Brussels Bruxelles-National Newark

$754United Airlines

Mon, Feb 8 - Wed, Feb 10

11:17 am - 7:55 amPWM Portland-LHR London Heathrow

15h 38m2 stops Newark Chicago O'Hare Intl

6:50 am - 6:13 pmLHR London Heathrow-PWM Portland

16h 23m2 stops Brussels Bruxelles-National Newark

$758United Airlines

Mon, Feb 8 - Wed, Feb 10

3:15 pm - 12:00 pmPWM Portland-LHR London Heathrow

15h 45m2 stops Newark Chicago O'Hare Intl

6:50 am - 10:57 pmLHR London Heathrow-PWM Portland

21h 07m2 stops Brussels Bruxelles-National Newark

$758United Airlines

Mon, Feb 8 - Wed, Feb 10

2:15 pm - 9:00 amPWM Portland-LHR London Heathrow

13h 45m1 stop Atlanta Hartsfield-Jackson

6:30 am - 11:33 pmLHR London Heathrow-PWM Portland

22h 03m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

$866Delta

Tue, Nov 10 - Tue, Nov 24

12:50 pm - 9:00 amPWM Portland-LHR London Heathrow

15h 10m2 stops Detroit Metropolitan Wayne County Atlanta Hartsfield-Jackson

10:00 am - 11:33 pmLHR London Heathrow-PWM Portland

18h 33m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

$871Delta

Tue, Nov 10 - Tue, Nov 24

12:50 pm - 9:00 amPWM Portland-LHR London Heathrow

15h 10m2 stops Detroit Metropolitan Wayne County Atlanta Hartsfield-Jackson

8:40 am - 11:55 pmLHR London Heathrow-PWM Portland

20h 15m2 stops Amsterdam Schiphol New York John F Kennedy Intl

$871Delta

Tue, Nov 10 - Tue, Nov 17

4:20 pm - 1:45 pmPWM Portland-LHR London Heathrow

16h 25m2 stops New York John F Kennedy Intl Paris Charles de Gaulle

9:55 am - 12:10 amLHR London Heathrow-PWM Portland

19h 15m2 stops Amsterdam Schiphol New York John F Kennedy Intl

$871Delta

Wed, Sep 23 - Tue, Oct 6

6:00 am - 8:45 pmPWM Portland-LHR London Heathrow

9h 45m1 stop New York John F Kennedy Intl

11:55 am - 11:54 pmLHR London Heathrow-PWM Portland

16h 59m1 stop New York John F Kennedy Intl

$874JetBlue

Sat, Sep 12 - Mon, Sep 28

8:45 am - 6:30 amPWM Portland-LHR London Heathrow

40h 45m2 stops Newark Toronto Pearson Intl

9:00 am - 11:21 pmLHR London Heathrow-PWM Portland

43h 21m2 stops Halifax Intl Newark

$880Air Canada

Sat, Nov 7 - Fri, Nov 20

6:00 am - 8:45 pmPWM Portland-LHR London Heathrow

9h 45m1 stop New York John F Kennedy Intl

8:15 am - 11:54 pmLHR London Heathrow-PWM Portland

20h 39m1 stop New York John F Kennedy Intl

$883JetBlue

Tue, Sep 15 - Mon, Sep 21

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Air Canada flights from Portland, Maine to London

Our best Air Canada deals on Portland, Maine to London flight tickets

Air Canada

Nov 7

PWM8:45 amPortland

40h 45m

2 stops

LHR6:30 amLondon Heathrow

Nov 20

LHR9:00 amLondon Heathrow

43h 21m

2 stops

PWM11:21 pmPortland

$880

Air Canada

Nov 10

PWM8:45 amPortland

18h 45m

3 stops

LHR8:30 amLondon Heathrow

Nov 17

LHR6:00 amLondon Heathrow

22h 21m

3 stops

PWM11:21 pmPortland

$886

Air Canada

Nov 7

PWM8:45 amPortland

16h 45m

3 stops

LHR6:30 amLondon Heathrow

Nov 20

LHR6:00 amLondon Heathrow

22h 21m

3 stops

PWM11:21 pmPortland

$913

United Airlines flights from Portland, Maine to London

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

United Airlines

Feb 8

PWM11:17 amPortland

16h 53m

1 stop

LHR9:10 amLondon Heathrow

Feb 10

LHR6:50 amLondon Heathrow

21h 07m

2 stops

PWM10:57 pmPortland

$754

United Airlines

Feb 8

PWM3:15 pmPortland

15h 45m

2 stops

LHR12:00 pmLondon Heathrow

Feb 10

LHR6:50 amLondon Heathrow

21h 07m

2 stops

PWM10:57 pmPortland

$758

United Airlines

Nov 10

PWM2:05 pmPortland

14h 05m

2 stops

LHR9:10 amLondon Heathrow

Nov 17

LHR6:50 amLondon Heathrow

17h 02m

2 stops

PWM6:52 pmPortland

$870

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 2/8

11:17 am-9:10 am

1 stop16h 53m

London Heathrow

Wed 2/10

6:50 am-10:57 pm

2 stops21h 07m

$754

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 2/8

11:17 am-7:55 am

2 stops15h 38m

London Heathrow

Wed 2/10

6:50 am-6:13 pm

2 stops16h 23m

$758

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 2/8

3:15 pm-12:00 pm

2 stops15h 45m

London Heathrow

Wed 2/10

6:50 am-10:57 pm

2 stops21h 07m

$758

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/10

2:15 pm-9:00 am

1 stop13h 45m

London Heathrow

Tue 11/24

6:30 am-11:33 pm

2 stops22h 03m

$866

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/10

12:50 pm-9:00 am

2 stops15h 10m

London Heathrow

Tue 11/24

10:00 am-11:33 pm

2 stops18h 33m

$871

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/10

12:50 pm-9:00 am

2 stops15h 10m

London Heathrow

Tue 11/17

8:40 am-11:55 pm

2 stops20h 15m

$871

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 9/23

4:20 pm-1:45 pm

2 stops16h 25m

London Heathrow

Tue 10/6

9:55 am-12:10 am

2 stops19h 15m

$871

Quickest round-trip

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 9/12

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Mon 9/28

11:55 am-11:54 pm

1 stop16h 59m

$874

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 11/7

8:45 am-6:30 am

2 stops40h 45m

London Heathrow

Fri 11/20

9:00 am-11:21 pm

2 stops43h 21m

$880

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 9/15

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Mon 9/21

8:15 am-11:54 pm

1 stop20h 39m

$883

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?

Prices are currently typical for flights on this route.

Typical prices usually range from $715 to $867.
The lowest price recently found on this route was $754.

What is the cheapest month to fly to London?

The cheapest month to fly to London from Portland, Maine is in January. Flight prices, which tend to average around $0, 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.

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	9h 45m
Direct flights	None

The fastest flight from Portland, Maine to London takes 9h 45m

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

Search flight deals

Frequently asked questions about flying from Portland, Maine to London

How far is Portland to London by plane?
London is 3183.1 mi away from Portland. Typically, this will take 9h 45m 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 is 1 operator available for flights from Portland Airport to London as of August 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 (100% of total bookings).

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 $752	Free Cancellation	Rating 7.4 10,105 reviews		Search United Airlines flights

Hounslow

Gatwick

Milton Keynes

Luton

Hayes

Wembley

Croydon

Dover

Stansted

Richmond

Kingston upon Thames

Harrow

Watford

Cobham

Slough

Uxbridge

Worthing

Romford

Ilford

Bedford

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.

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Cheap flights from Portland, Maine to London from $329

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to London departing on 9/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Air Canada flights from Portland, Maine to London

Our best Air Canada deals on Portland, Maine to London flight tickets

United Airlines flights from Portland, Maine to London

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

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

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

What is the cheapest month to fly to London?

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

What airlines fly to London?

When to book flights from Portland, Maine to London

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

Fastest flight time

Direct flights

Frequently asked questions about flying from Portland, Maine to London

Best airlines flying from Portland, Maine to London

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

Traveling to a place near London?

Why use momondo?

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London

Fly your favorite airline to London

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to London

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

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Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Portland, Maine

According to popular flight searches on momondo this year

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