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

Virgin Atlantic, 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 47% of people opting to fly with this airline when travelling to London. Keep in mind that there are 8 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

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Cheap return flights

Enter your travel dates to find the best prices.

15:14 - 10:25PWM Portland-LHR London Heathrow

14h 11m1 stop Newark

06:50 - 23:25LHR London Heathrow-PWM Portland

21h 35m2 stops Brussels Bruxelles-National Newark

£569United Airlines

Tue, 23 Feb - Thu, 25 Feb

16:40 - 07:55PWM Portland-LHR London Heathrow

34h 15m1 stop Chicago O'Hare Intl

06:50 - 16:32LHR London Heathrow-PWM Portland

14h 42m2 stops Brussels Bruxelles-National Newark

£573United Airlines

Tue, 2 Mar - Fri, 5 Mar

15:14 - 11:15PWM Portland-LHR London Heathrow

15h 01m2 stops Newark Zurich

06:50 - 18:50LHR London Heathrow-PWM Portland

17h 00m2 stops Brussels Bruxelles-National Newark

£611United Airlines

Tue, 23 Feb - Thu, 25 Feb

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

34h 00m2 stops Newark Halifax Intl

09:00 - 21:12LHR London Heathrow-PWM Portland

41h 12m2 stops Halifax Intl Newark

£636Air Canada

Tue, 1 Dec - Wed, 9 Dec

12:49 - 07:45PWM Portland-LHR London Heathrow

13h 56m1 stop Detroit Metropolitan Wayne County

11:45 - 00:21LHR London Heathrow-PWM Portland

17h 36m2 stops Amsterdam Schiphol New York John F Kennedy Intl

£643KLM

Tue, 1 Dec - Wed, 9 Dec

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

19h 20m1 stop Newark

12:05 - 23:24LHR London Heathrow-PWM Portland

16h 19m2 stops Zurich Newark

£654United Airlines

Sat, 5 Dec - Sat, 12 Dec

16:00 - 07:15PWM Portland-LHR London Heathrow

10h 15m1 stop New York John F Kennedy Intl

10:00 - 23:52LHR London Heathrow-PWM Portland

18h 52m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

£654Delta

Fri, 4 Dec - Fri, 11 Dec

12:49 - 10:30PWM Portland-LHR London Heathrow

16h 41m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

10:00 - 23:33LHR London Heathrow-PWM Portland

18h 33m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

£658Delta

Fri, 4 Dec - Tue, 8 Dec

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

10h 20m1 stop Newark

13:00 - 19:25LHR London Heathrow-PWM Portland

35h 25m2 stops Montreal Pierre Elliott Trudeau Intl Newark

£662United Airlines

Tue, 8 Dec - Fri, 11 Dec

12:49 - 07:45PWM Portland-LHR London Heathrow

13h 56m1 stop Detroit Metropolitan Wayne County

12:40 - 23:33LHR London Heathrow-PWM Portland

15h 53m1 stop Atlanta Hartsfield-Jackson

£663KLM

Tue, 1 Dec - Wed, 9 Dec

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United Airlines flights from Portland, Maine to London

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

United Airlines

23 Feb

PWM15:14Portland

14h 11m

1 stop

LHR10:25London Heathrow

25 Feb

LHR06:50London Heathrow

21h 35m

2 stops

PWM23:25Portland

£569

United Airlines

2 Mar

PWM16:40Portland

34h 15m

1 stop

LHR07:55London Heathrow

5 Mar

LHR06:50London Heathrow

14h 42m

2 stops

PWM16:32Portland

£573

United Airlines

23 Feb

PWM15:14Portland

15h 01m

2 stops

LHR11:15London Heathrow

25 Feb

LHR06:50London Heathrow

17h 00m

2 stops

PWM18:50Portland

£611

Air Canada flights from Portland, Maine to London

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

Air Canada

1 Dec

PWM06:00Portland

34h 00m

2 stops

LHR21:00London Heathrow

9 Dec

LHR09:00London Heathrow

41h 12m

2 stops

PWM21:12Portland

£636

Air Canada

21 Jan

PWM09:10Portland

17h 00m

3 stops

LHR07:10London Heathrow

27 Jan

LHR09:00London Heathrow

19h 32m

3 stops

PWM23:32Portland

£678

Air Canada

11 Jan

PWM09:10Portland

18h 20m

3 stops

LHR08:30London Heathrow

15 Jan

LHR18:00London Heathrow

24h 34m

3 stops

PWM13:34Portland

£707

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 23/2

15:14-10:25

1 stop14h 11m

London Heathrow

Thu 25/2

06:50-23:25

2 stops21h 35m

£569

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 2/3

16:40-07:55

1 stop34h 15m

London Heathrow

Fri 5/3

06:50-16:32

2 stops14h 42m

£573

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 23/2

15:14-11:15

2 stops15h 01m

London Heathrow

Thu 25/2

06:50-18:50

2 stops17h 00m

£611

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 1/12

06:00-21:00

2 stops34h 00m

London Heathrow

Wed 9/12

09:00-21:12

2 stops41h 12m

£636

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 1/12

12:49-07:45

1 stop13h 56m

London Heathrow

Wed 9/12

11:45-00:21

2 stops17h 36m

£643

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 5/12

06:00-06:20

1 stop19h 20m

London Heathrow

Sat 12/12

12:05-23:24

2 stops16h 19m

£654

Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 4/12

16:00-07:15

1 stop10h 15m

London Heathrow

Fri 11/12

10:00-23:52

2 stops18h 52m

£654

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 4/12

12:49-10:30

2 stops16h 41m

London Heathrow

Tue 8/12

10:00-23:33

2 stops18h 33m

£658

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 8/12

06:00-21:20

1 stop10h 20m

London Heathrow

Fri 11/12

13:00-19:25

2 stops35h 25m

£662

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 1/12

12:49-07:45

1 stop13h 56m

London Heathrow

Wed 9/12

12:40-23:33

1 stop15h 53m

£663

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 February is another great option to travel to London, with average flight prices from Portland, Maine averaging around £561.

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	10h 25m
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 £569.

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?
A flight from Portland to London will travel around 3183.1 mi. 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 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.

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Canterbury

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Hayes

Bedford

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Harlow

Winchester

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.

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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 10/3. 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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United Airlines flights from Portland, Maine to London

Our best United Airlines 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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