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

American Airlines, United Airlines, 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 49% of people opting to fly with this airline when traveling to London. Keep in mind that there are 16 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 May 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.

$330 Cheap Flights from Portland, Maine to London in 2026

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 $888 to $731. The lowest price recently found on this route was $851.

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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.

6:00 am - 4:25 pm

PWM

LHR

29h 25m

2 stops

3:35 pm - 11:59 pm

LHR

PWM

37h 24m

2 stops

$851Scandinavian Airlines

Thu, Aug 27 - Tue, Sep 1

2:53 pm - 12:05 pm

PWM

LHR

16h 12m

1 stop

8:55 am - 12:59 am

LHR

PWM

21h 04m

2 stops

$877Delta

Wed, Aug 12 - Thu, Aug 20

4:47 pm - 1:05 pm

PWM

LHR

15h 18m

2 stops

8:55 am - 12:59 am

LHR

PWM

21h 04m

2 stops

$882Delta

Wed, Aug 12 - Thu, Aug 20

6:00 am - 8:40 pm

PWM

LHR

9h 40m

1 stop

6:50 am - 6:54 pm

LHR

PWM

17h 04m

2 stops

$890United Airlines

Mon, Aug 24 - Fri, Sep 11

6:05 am - 6:25 am

PWM

LHR

19h 20m

1 stop

11:15 am - 11:20 pm

LHR

PWM

17h 05m

1 stop

$899Virgin Atlantic

Wed, Aug 12 - Thu, Aug 20

3:25 pm - 9:35 pm

PWM

LHR

49h 10m

2 stops

9:00 am - 4:09 pm

LHR

PWM

35h 09m

2 stops

$902Air Canada

Fri, Oct 23 - Tue, Oct 27

6:00 am - 6:30 am

PWM

LHR

19h 30m

2 stops

2:05 pm - 6:29 pm

LHR

PWM

33h 24m

2 stops

$903Air Canada

Tue, Aug 18 - Fri, Aug 21

3:44 pm - 10:40 am

PWM

LHR

13h 56m

2 stops

7:30 am - 6:54 pm

LHR

PWM

16h 24m

2 stops

$906United Airlines

Mon, Aug 24 - Fri, Sep 11

5:01 pm - 10:00 am

PWM

LGW

35h 59m

2 stops

2:00 pm - 9:12 am

LGW

PWM

24h 12m

1 stop

$960Multiple Airlines

Sat, Jun 6 - Fri, Jun 12

9:52 am - 10:00 am

PWM

LGW

19h 08m

1 stop

2:00 pm - 9:08 am

LGW

PWM

24h 08m

1 stop

$1,015Multiple Airlines

Mon, Aug 24 - Fri, Sep 11

Scandinavian Airlines flights from Portland, Maine to London

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

Scandinavian Airlines

Aug 27

PWM6:00 amPortland

29h 25m

2 stops

LHR4:25 pmLondon Heathrow

Sep 1

LHR3:35 pmLondon Heathrow

37h 24m

2 stops

PWM11:59 pmPortland

$851

Scandinavian Airlines

Sep 19

PWM6:30 amPortland

22h 05m

2 stops

LHR9:35 amLondon Heathrow

Sep 26

LHR6:40 amLondon Heathrow

22h 19m

2 stops

PWM11:59 pmPortland

$887

Scandinavian Airlines

Aug 27

PWM6:00 amPortland

29h 25m

2 stops

LHR4:25 pmLondon Heathrow

Sep 1

LHR7:05 amLondon Heathrow

21h 54m

3 stops

PWM11:59 pmPortland

$980

United Airlines flights from Portland, Maine to London

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

United Airlines

Aug 24

PWM6:00 amPortland

9h 40m

1 stop

LHR8:40 pmLondon Heathrow

Sep 11

LHR6:50 amLondon Heathrow

17h 04m

2 stops

PWM6:54 pmPortland

$890

United Airlines

Aug 24

PWM3:44 pmPortland

13h 56m

2 stops

LHR10:40 amLondon Heathrow

Sep 11

LHR7:30 amLondon Heathrow

16h 24m

2 stops

PWM6:54 pmPortland

$906

United Airlines

Oct 27

PWM5:06 pmPortland

13h 19m

1 stop

LHR10:25 amLondon Heathrow

Nov 2

LHR6:50 amLondon Heathrow

14h 19m

2 stops

PWM4:09 pmPortland

$909

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 8/27

6:00 am-4:25 pm

2 stops29h 25m

London Heathrow

Tue 9/1

3:35 pm-11:59 pm

2 stops37h 24m

$851

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 8/12

2:53 pm-12:05 pm

1 stop16h 12m

London Heathrow

Thu 8/20

8:55 am-12:59 am

2 stops21h 04m

$877

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 8/12

4:47 pm-1:05 pm

2 stops15h 18m

London Heathrow

Thu 8/20

8:55 am-12:59 am

2 stops21h 04m

$882

Quickest round-trip

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 8/24

6:00 am-8:40 pm

1 stop9h 40m

London Heathrow

Fri 9/11

6:50 am-6:54 pm

2 stops17h 04m

$890

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 8/12

6:05 am-6:25 am

1 stop19h 20m

London Heathrow

Thu 8/20

11:15 am-11:20 pm

1 stop17h 05m

$899

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 10/23

3:25 pm-9:35 pm

2 stops49h 10m

London Heathrow

Tue 10/27

9:00 am-4:09 pm

2 stops35h 09m

$902

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 8/18

6:00 am-6:30 am

2 stops19h 30m

London Heathrow

Fri 8/21

2:05 pm-6:29 pm

2 stops33h 24m

$903

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 8/24

3:44 pm-10:40 am

2 stops13h 56m

London Heathrow

Fri 9/11

7:30 am-6:54 pm

2 stops16h 24m

$906

PortlandLondon

PWM - LGW

PWMLGW

Portland

Sat 6/6

5:01 pm-10:00 am

2 stops35h 59m

London Gatwick

Fri 6/12

2:00 pm-9:12 am

1 stop24h 12m

$960

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 8/24

9:52 am-10:00 am

1 stop19h 08m

London Gatwick

Fri 9/11

2:00 pm-9:08 am

1 stop24h 08m

$1,015

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 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 October is another great option to travel to London, with average flight prices from Portland, Maine averaging around $599.

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 25m
Direct flights	None

The fastest flight from Portland, Maine to London takes 10h 25m

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 10h 25m 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 May 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 (56% of total bookings). The next most popular airline is American Airlines (44%).

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 9,694 reviews		Search United Airlines flights

Hounslow

Gatwick

Milton Keynes

Dover

Luton

Hayes

Crawley

Wembley

Slough

Stansted

Watford

Croydon

Brentwood

Dartford

Cobham

Folkestone

Romford

Harrow

Uxbridge

Guildford

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 $330

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 8/17. 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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Scandinavian Airlines flights from Portland, Maine to London

Our best Scandinavian Airlines 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

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

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.

Popular cities in the United Kingdom

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

Complete your trip to London

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