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

Which airlines fly to London?

British Airways, Virgin Atlantic 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 45% of people opting to fly with this airline when travelling to London. Keep in mind that there are 9 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 old do you have to be to fly from Portland Airport to London?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Portland Airport to London.

What documentation or ID do you need to fly to London?

The necessary travel and health documents for your London trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

£249 Cheap Flights from Portland, Maine to London in 2026/27

Find the cheapest flights from Portland, Maine to London

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One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

14:05 - 10:50PWM Portland-LHR London Heathrow

15h 45m1 stop Washington, D.C. Dulles Intl

09:00 - 23:21LHR London Heathrow-PWM Portland

19h 21m2 stops Zurich Newark

£652United Airlines

Sat, 7 Nov - Sat, 14 Nov

06:00 - 21:20PWM Portland-LHR London Heathrow

10h 20m1 stop Newark

06:50 - 19:12LHR London Heathrow-PWM Portland

17h 22m2 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl

£653United Airlines

Sat, 28 Nov - Thu, 3 Dec

06:00 - 07:10PWM Portland-LHR London Heathrow

20h 10m2 stops Newark Montreal Pierre Elliott Trudeau Intl

12:05 - 23:21LHR London Heathrow-PWM Portland

16h 16m2 stops Zurich Newark

£655United Airlines

Sat, 14 Nov - Sat, 21 Nov

09:46 - 05:55PWM Portland-LHR London Heathrow

15h 09m2 stops Washington, D.C. Dulles Intl Chicago O'Hare Intl

12:05 - 23:21LHR London Heathrow-PWM Portland

16h 16m2 stops Zurich Newark

£655United Airlines

Sat, 7 Nov - Sat, 14 Nov

15:41 - 10:50PWM Portland-LHR London Heathrow

15h 09m2 stops Newark Washington, D.C. Dulles Intl

06:50 - 19:02LHR London Heathrow-PWM Portland

16h 12m2 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl

£657United Airlines

Mon, 26 Oct - Fri, 30 Oct

08:29 - 05:55PWM Portland-LHR London Heathrow

16h 26m1 stop Chicago O'Hare Intl

06:35 - 09:05LHR London Heathrow-PWM Portland

31h 30m2 stops Munich Franz Josef Strauss Newark

£658United Airlines

Fri, 27 Nov - Fri, 4 Dec

14:15 - 10:50PWM Portland-LHR London Heathrow

15h 35m1 stop Washington, D.C. Dulles Intl

06:50 - 21:03LHR London Heathrow-PWM Portland

19h 13m2 stops Brussels Bruxelles-National Newark

£661United Airlines

Wed, 3 Feb - Sun, 7 Feb

12:50 - 07:45PWM Portland-LHR London Heathrow

13h 55m1 stop Detroit Metropolitan Wayne County

06:30 - 16:13LHR London Heathrow-PWM Portland

14h 43m2 stops Amsterdam Schiphol Detroit Metropolitan Wayne County

£662KLM

Fri, 5 Mar - Fri, 12 Mar

07:30 - 21:00PWM Portland-LHR London Heathrow

32h 30m2 stops Newark Ottawa

06:50 - 21:03LHR London Heathrow-PWM Portland

19h 13m2 stops Brussels Bruxelles-National Newark

£662United Airlines

Thu, 7 Jan - Thu, 14 Jan

08:49 - 08:30PWM Portland-LHR London Heathrow

19h 41m2 stops Newark Toronto Pearson Intl

09:00 - 18:52LHR London Heathrow-PWM Portland

37h 52m2 stops Halifax Intl Newark

£664Air Canada

Mon, 26 Oct - Fri, 30 Oct

Cheap last-minute flights

Enter your travel dates to find the best prices.

12:42 - 07:10PWM Portland-LHR London Heathrow

13h 28m1 stop Detroit Metropolitan Wayne County

10:50 - 23:35LHR London Heathrow-PWM Portland

16h 45m1 stop Atlanta Hartsfield-Jackson

£774Delta

Mon, 19 Oct - Sun, 25 Oct

16:47 - 12:05PWM Portland-LHR London Heathrow

14h 18m2 stops Detroit Metropolitan Wayne County New York John F Kennedy Intl

10:50 - 23:35LHR London Heathrow-PWM Portland

16h 45m1 stop Atlanta Hartsfield-Jackson

£778Delta

Mon, 19 Oct - Sun, 25 Oct

14:09 - 13:15PWM Portland-LHR London Heathrow

18h 06m1 stop Atlanta Hartsfield-Jackson

15:50 - 00:10LHR London Heathrow-PWM Portland

13h 20m1 stop New York John F Kennedy Intl

£786Multiple Airlines

Sun, 18 Oct - Sat, 24 Oct

12:42 - 10:30PWM Portland-LHR London Heathrow

16h 48m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

15:50 - 00:10LHR London Heathrow-PWM Portland

13h 20m1 stop New York John F Kennedy Intl

£795Delta

Sun, 18 Oct - Sat, 24 Oct

12:42 - 10:30PWM Portland-LHR London Heathrow

16h 48m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

06:15 - 21:00LHR London Heathrow-PWM Portland

19h 45m2 stops Paris Charles de Gaulle Atlanta Hartsfield-Jackson

£818Delta

Sun, 18 Oct - Sat, 24 Oct

10:43 - 21:00PWM Portland-LHR London Heathrow

29h 17m2 stops Newark Halifax Intl

09:00 - 23:21LHR London Heathrow-PWM Portland

42h 21m2 stops Halifax Intl Newark

£835Air Canada

Mon, 19 Oct - Sun, 25 Oct

15:41 - 11:50PWM Portland-LHR London Heathrow

15h 09m2 stops Newark Toronto Pearson Intl

18:00 - 13:26LHR London Heathrow-PWM Portland

23h 26m3 stops Toronto Pearson Intl Ottawa Newark

£1,274Multiple Airlines

Mon, 19 Oct - Sun, 25 Oct

08:03 - 06:35PWM Portland-LHR London Heathrow

17h 32m3 stops Newark Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl

18:00 - 13:26LHR London Heathrow-PWM Portland

23h 26m3 stops Toronto Pearson Intl Ottawa Newark

£1,724Air Canada

Mon, 19 Oct - Sun, 25 Oct

07:00 - 11:30PWM Portland-LHR London Heathrow

47h 30m3 stops Chicago O'Hare Intl Hong Kong Intl Zurich

18:20 - 23:43LHR London Heathrow-PWM Portland

34h 23m2 stops Hong Kong Intl New York John F Kennedy Intl

£10,064Multiple Airlines

Sun, 18 Oct - Sat, 24 Oct

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KLM flights from Portland, Maine to London

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

KLM

5 Mar

PWM12:50Portland

13h 55m

1 stop

LHR07:45London Heathrow

12 Mar

LHR06:30London Heathrow

14h 43m

2 stops

PWM16:13Portland

£662

KLM

28 Mar

PWM06:00Portland

19h 25m

1 stop

LHR06:25London Heathrow

4 Apr

LHR13:25London Heathrow

14h 58m

1 stop

PWM23:23Portland

£689

Air Canada flights from Portland, Maine to London

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

Air Canada

26 Oct

PWM08:49Portland

19h 41m

2 stops

LHR08:30London Heathrow

30 Oct

LHR09:00London Heathrow

37h 52m

2 stops

PWM18:52Portland

£664

Air Canada

3 Feb

PWM09:10Portland

17h 00m

3 stops

LHR07:10London Heathrow

7 Feb

LHR09:00London Heathrow

19h 32m

3 stops

PWM23:32Portland

£674

Air Canada

6 Jan

PWM07:30Portland

18h 00m

3 stops

LHR06:30London Heathrow

13 Jan

LHR18:00London Heathrow

24h 34m

3 stops

PWM13:34Portland

£703

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 7/11

14:05-10:50

1 stop15h 45m

London Heathrow

Sat 14/11

09:00-23:21

2 stops19h 21m

£652

Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 28/11

06:00-21:20

1 stop10h 20m

London Heathrow

Thu 3/12

06:50-19:12

2 stops17h 22m

£653

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 14/11

06:00-07:10

2 stops20h 10m

London Heathrow

Sat 21/11

12:05-23:21

2 stops16h 16m

£655

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 7/11

09:46-05:55

2 stops15h 09m

London Heathrow

Sat 14/11

12:05-23:21

2 stops16h 16m

£655

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 26/10

15:41-10:50

2 stops15h 09m

London Heathrow

Fri 30/10

06:50-19:02

2 stops16h 12m

£657

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 27/11

08:29-05:55

1 stop16h 26m

London Heathrow

Fri 4/12

06:35-09:05

2 stops31h 30m

£658

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 3/2

14:15-10:50

1 stop15h 35m

London Heathrow

Sun 7/2

06:50-21:03

2 stops19h 13m

£661

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 5/3

12:50-07:45

1 stop13h 55m

London Heathrow

Fri 12/3

06:30-16:13

2 stops14h 43m

£662

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 7/1

07:30-21:00

2 stops32h 30m

London Heathrow

Thu 14/1

06:50-21:03

2 stops19h 13m

£662

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 26/10

08:49-08:30

2 stops19h 41m

London Heathrow

Fri 30/10

09:00-18:52

2 stops37h 52m

£664

Flights are sorted by cheapest return 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 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 £529.

Can stopping save me money on Portland, Maine to London flights?

You could potentially save up to 38% on your flight if you consider stops on a Portland, Maine to London flight.

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 return 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

Best price found	£249
Fastest flight time	9h 45m
Direct flights	None

The best one-way flight to London from Portland, Maine in the past 72 hours is £249. The best return flight deal from Portland, Maine to London found on momondo in the last 72 hours is £652.

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?
A flight from Portland to London will travel around 3183.1 mi. 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 old do you have to be to fly from Portland Airport to London?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Portland Airport to London.
What documentation or ID do you need to fly to London?
The necessary travel and health documents for your London trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Eastbourne

Wembley

Gatwick

Milton Keynes

Southend-on-Sea

Luton

Ipswich

Slough

Maidstone

Folkestone

Hastings

Ilford

Canterbury

Chichester

Colchester

Hayes

Guildford

Bedford

Worthing

Harlow

Why use momondo?

Why should I use momondo to find a flight deal from Portland to London?

It is quick and easy to find Portland to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

Can I find flights from Portland to London with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Portland to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Portland to London?

momondo helps you find the best flight between Portland and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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.

An easier way to manage your London trip

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Cheap flights from Portland, Maine to London from £249

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 28/3. 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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KLM flights from Portland, Maine to London

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

Air Canada flights from Portland, Maine to London

Our best Air Canada 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?

Can stopping save me money on Portland, Maine to London flights?

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

Which 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

Best price found

Fastest flight time

Direct flights

Frequently asked questions about flying from Portland, Maine to London

Travelling to a place near London?

Why use momondo?

An easier way to manage your London trip

We make it super easy to schedule, organise 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 favourite airline to London

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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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