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

Air Canada, Delta, and United Airlines 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.

£252 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

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15:41 - 16:20PWM Portland-LHR London Heathrow

19h 39m2 stops Newark Zurich

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

43h 21m2 stops Halifax Intl Newark

£566United Airlines

Mon, 16 Nov - Wed, 18 Nov

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

£567United Airlines

Mon, 16 Nov - Wed, 18 Nov

15:41 - 16:20PWM Portland-LHR London Heathrow

19h 39m2 stops Newark Zurich

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

43h 21m2 stops Halifax Intl Newark

£568United Airlines

Mon, 16 Nov - Wed, 18 Nov

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

£568United Airlines

Mon, 16 Nov - Wed, 18 Nov

15:41 - 16:20PWM Portland-LHR London Heathrow

19h 39m2 stops Newark Zurich

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

43h 21m2 stops Halifax Intl Newark

£571United Airlines

Mon, 16 Nov - Wed, 18 Nov

15:41 - 16:20PWM Portland-LHR London Heathrow

19h 39m2 stops Newark Zurich

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

43h 21m2 stops Halifax Intl Newark

£572United Airlines

Mon, 16 Nov - Wed, 18 Nov

15:41 - 09:10PWM Portland-LHR London Heathrow

12h 29m1 stop Newark

06:50 - 23:21LHR London Heathrow-PWM Portland

21h 31m2 stops Brussels Bruxelles-National Newark

£573United Airlines

Mon, 16 Nov - Wed, 18 Nov

15:41 - 10:05PWM Portland-LHR London Heathrow

13h 24m2 stops Newark Brussels Bruxelles-National

09:10 - 21:51LHR London Heathrow-PWM Portland

17h 41m2 stops Newark Chicago O'Hare Intl

£587United Airlines

Mon, 16 Nov - Wed, 18 Nov

05:50 - 07:10PWM Portland-LHR London Heathrow

44h 20m2 stops Newark Montreal Pierre Elliott Trudeau Intl

06:50 - 23:21LHR London Heathrow-PWM Portland

21h 31m2 stops Brussels Bruxelles-National Newark

£601United Airlines

Fri, 20 Nov - Mon, 23 Nov

06:30 - 21:40PWM Portland-LHR London Heathrow

10h 10m1 stop New York John F Kennedy Intl

12:20 - 23:43LHR London Heathrow-PWM Portland

16h 23m1 stop New York John F Kennedy Intl

£622JetBlue

Mon, 16 Nov - Wed, 18 Nov

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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

16 Nov

PWM15:41Portland

19h 39m

2 stops

LHR16:20London Heathrow

18 Nov

LHR09:00London Heathrow

43h 21m

2 stops

PWM23:21Portland

£566

United Airlines

16 Nov

PWM14:05Portland

15h 45m

1 stop

LHR10:50London Heathrow

18 Nov

LHR09:00London Heathrow

19h 21m

2 stops

PWM23:21Portland

£567

United Airlines

16 Nov

PWM15:41Portland

19h 39m

2 stops

LHR16:20London Heathrow

18 Nov

LHR09:00London Heathrow

43h 21m

2 stops

PWM23:21Portland

£568

Delta flights from Portland, Maine to London

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

Delta

1 Dec

PWM16:00Portland

12h 25m

1 stop

LHR09:25London Heathrow

8 Dec

LHR08:40London Heathrow

19h 53m

2 stops

PWM23:33Portland

£646

Delta

28 Dec

PWM13:20Portland

25h 50m

1 stop

LHR20:10London Heathrow

7 Jan

LHR06:30London Heathrow

22h 19m

2 stops

PWM23:49Portland

£674

Delta

11 Feb

PWM14:35Portland

13h 50m

1 stop

LHR09:25London Heathrow

22 Feb

LHR15:50London Heathrow

12h 59m

1 stop

PWM23:49Portland

£677

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-16:20

2 stops19h 39m

London Heathrow

Wed 18/11

09:00-23:21

2 stops43h 21m

£566

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

14:05-10:50

1 stop15h 45m

London Heathrow

Wed 18/11

09:00-23:21

2 stops19h 21m

£567

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-16:20

2 stops19h 39m

London Heathrow

Wed 18/11

09:00-23:21

2 stops43h 21m

£568

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

14:05-10:50

1 stop15h 45m

London Heathrow

Wed 18/11

09:00-23:21

2 stops19h 21m

£568

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-16:20

2 stops19h 39m

London Heathrow

Wed 18/11

09:00-23:21

2 stops43h 21m

£571

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-16:20

2 stops19h 39m

London Heathrow

Wed 18/11

09:00-23:21

2 stops43h 21m

£572

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-09:10

1 stop12h 29m

London Heathrow

Wed 18/11

06:50-23:21

2 stops21h 31m

£573

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-10:05

2 stops13h 24m

London Heathrow

Wed 18/11

09:10-21:51

2 stops17h 41m

£587

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 20/11

05:50-07:10

2 stops44h 20m

London Heathrow

Mon 23/11

06:50-23:21

2 stops21h 31m

£601

Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

06:30-21:40

1 stop10h 10m

London Heathrow

Wed 18/11

12:20-23:43

1 stop16h 23m

£622

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 £523.

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	£252
Fastest flight time	11h 05m
Direct flights	None

The best one-way flight to London from Portland, Maine in the past 72 hours is £252. The best return flight deal from Portland, Maine to London found on momondo in the last 72 hours is £566.

The fastest flight from Portland, Maine to London takes 11h 05m

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 11h 05m 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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Slough

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Canterbury

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Colchester

Guildford

Hayes

Bedford

Worthing

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 £252

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 18/11. 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

Delta flights from Portland, Maine to London

Our best Delta 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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