What airlines fly to London?

British Airways, American Airlines and Delta 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 48% 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.

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

Air Canada, JetBlue, 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 is 1 operator available for flights from Portland Airport to London as of June 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.

$318 Cheap Flights from Portland, Maine to London in 2026

Discover deals from 900+ travel sites with momondo.

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.

3:43 pm - 8:25 am

PWM

LHR

11h 42m

1 stop

6:50 am - 4:09 pm

LHR

PWM

14h 19m

2 stops

$738United Airlines

Sun, Nov 15 - Tue, Nov 17

2:23 pm - 9:10 am

PWM

LHR

13h 47m

2 stops

6:50 am - 6:21 pm

LHR

PWM

16h 31m

2 stops

$742United Airlines

Sun, Nov 15 - Tue, Nov 17

6:30 am - 9:30 am

PWM

LHR

22h 00m

1 stop

12:20 pm - 11:43 pm

LHR

PWM

16h 23m

1 stop

$793JetBlue

Tue, Nov 10 - Tue, Nov 17

6:00 am - 8:45 pm

PWM

LHR

9h 45m

1 stop

8:15 am - 12:30 pm

LHR

PWM

33h 15m

1 stop

$812JetBlue

Thu, Aug 20 - Mon, Aug 31

2:35 pm - 1:45 pm

PWM

LHR

18h 10m

2 stops

12:20 pm - 11:43 pm

LHR

PWM

16h 23m

1 stop

$835Multiple Airlines

Tue, Nov 10 - Tue, Nov 17

6:02 am - 9:35 am

PWM

LHR

22h 33m

2 stops

3:35 pm - 11:56 pm

LHR

PWM

37h 21m

2 stops

$863Scandinavian Airlines

Sat, Sep 12 - Sat, Sep 19

6:02 am - 9:35 am

PWM

LHR

22h 33m

2 stops

3:35 pm - 11:56 pm

LHR

PWM

37h 21m

2 stops

$864Scandinavian Airlines

Sat, Sep 12 - Sat, Sep 19

11:07 am - 10:00 am

PWM

LGW

17h 53m

1 stop

2:00 pm - 9:19 pm

LGW

PWM

36h 19m

2 stops

$919Multiple Airlines

Wed, Aug 19 - Mon, Aug 24

10:00 am - 9:00 am

PWM

LGW

18h 00m

2 stops

10:00 am - 11:49 pm

LGW

PWM

18h 49m

2 stops

$936Delta

Wed, Dec 2 - Mon, Dec 7

2:53 pm - 9:25 am

PWM

LGW

13h 32m

2 stops

10:25 am - 11:56 pm

LGW

PWM

18h 31m

2 stops

$968Delta

Thu, Aug 27 - Thu, Sep 10

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Delta flights from Portland, Maine to London

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

Delta

Oct 4

PWM12:55 pmPortland

19h 20m

2 stops

LHR1:15 pmLondon Heathrow

Oct 9

LHR9:55 amLondon Heathrow

17h 28m

2 stops

PWM10:23 pmPortland

$900

Delta

Dec 2

PWM10:00 amPortland

18h 00m

2 stops

LGW9:00 amLondon Gatwick

Dec 7

LGW10:00 amLondon Gatwick

18h 49m

2 stops

PWM11:49 pmPortland

$936

Delta

Aug 27

PWM2:53 pmPortland

13h 37m

2 stops

LCY9:30 amLondon City

Sep 10

LCY10:00 amLondon City

18h 56m

2 stops

PWM11:56 pmPortland

$985

JetBlue flights from Portland, Maine to London

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

JetBlue

Nov 10

PWM6:30 amPortland

22h 00m

1 stop

LHR9:30 amLondon Heathrow

Nov 17

LHR12:20 pmLondon Heathrow

16h 23m

1 stop

PWM11:43 pmPortland

$793

JetBlue

Aug 20

PWM6:00 amPortland

9h 45m

1 stop

LHR8:45 pmLondon Heathrow

Aug 31

LHR8:15 amLondon Heathrow

33h 15m

1 stop

PWM12:30 pmPortland

$812

JetBlue

Sep 23

PWM6:00 amPortland

9h 45m

1 stop

LHR8:45 pmLondon Heathrow

Sep 30

LHR8:15 amLondon Heathrow

20h 37m

1 stop

PWM11:52 pmPortland

$832

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 11/15

3:43 pm-8:25 am

1 stop11h 42m

London Heathrow

Tue 11/17

6:50 am-4:09 pm

2 stops14h 19m

$738

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 11/15

2:23 pm-9:10 am

2 stops13h 47m

London Heathrow

Tue 11/17

6:50 am-6:21 pm

2 stops16h 31m

$742

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/10

6:30 am-9:30 am

1 stop22h 00m

London Heathrow

Tue 11/17

12:20 pm-11:43 pm

1 stop16h 23m

$793

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 8/20

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Mon 8/31

8:15 am-12:30 pm

1 stop33h 15m

$812

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/10

2:35 pm-1:45 pm

2 stops18h 10m

London Heathrow

Tue 11/17

12:20 pm-11:43 pm

1 stop16h 23m

$835

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 9/12

6:02 am-9:35 am

2 stops22h 33m

London Heathrow

Sat 9/19

3:35 pm-11:56 pm

2 stops37h 21m

$863

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 9/12

6:02 am-9:35 am

2 stops22h 33m

London Heathrow

Sat 9/19

3:35 pm-11:56 pm

2 stops37h 21m

$864

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 8/19

11:07 am-10:00 am

1 stop17h 53m

London Gatwick

Mon 8/24

2:00 pm-9:19 pm

2 stops36h 19m

$919

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 12/2

10:00 am-9:00 am

2 stops18h 00m

London Gatwick

Mon 12/7

10:00 am-11:49 pm

2 stops18h 49m

$936

PortlandLondon

PWM - LGW

PWMLGW

Portland

Thu 8/27

2:53 pm-9:25 am

2 stops13h 32m

London Gatwick

Thu 9/10

10:25 am-11:56 pm

2 stops18h 31m

$968

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 $0, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from Portland, Maine averaging around $0.

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 40m
Direct flights	None

The fastest flight from Portland, Maine to London takes 9h 40m

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 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 is 1 operator available for flights from Portland Airport to London as of June 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 9,894 reviews		Search United Airlines flights

Hounslow

Gatwick

Milton Keynes

Luton

Hayes

Dover

Crawley

Croydon

Wembley

Stansted

Harrow

Slough

Watford

Ilford

Cobham

Brentwood

Folkestone

Guildford

Romford

Uxbridge

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 $318

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 10/24. 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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Delta flights from Portland, Maine to London

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

JetBlue flights from Portland, Maine to London

Our best JetBlue 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 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

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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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