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 44% 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.

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

American Airlines, Air Canada, and KLM 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 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.

£343 Cheap Flights from Portland to London in 2025/26

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Find the cheapest flights from Portland, Maine to London

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05:30 - 06:25PWM-LHR

19h 55m1 stop

10:00 - 00:20LHR-PWM

19h 20m2 stops

£477Delta

Find Deal

Fri, 16 Jan - Fri, 23 Jan

14:35 - 06:20PWM-LHR

10h 45m1 stop

08:40 - 00:20LHR-PWM

20h 40m2 stops

£478Delta

Find Deal

Fri, 23 Jan - Tue, 27 Jan

12:43 - 06:50PWM-LHR

13h 07m2 stops

11:45 - 00:20LHR-PWM

17h 35m2 stops

£481Delta

Find Deal

Fri, 23 Jan - Tue, 27 Jan

12:43 - 06:50PWM-LHR

13h 07m2 stops

11:45 - 00:20LHR-PWM

17h 35m2 stops

£482Delta

Find Deal

Fri, 23 Jan - Tue, 27 Jan

14:35 - 10:15PWM-LHR

14h 40m1 stop

16:10 - 00:20LHR-PWM

13h 10m1 stop

£498KLM

Find Deal

Fri, 16 Jan - Fri, 23 Jan

06:00 - 20:45PWM-LHR

9h 45m1 stop

08:15 - 23:36LHR-PWM

20h 21m1 stop

£541JetBlue

Find Deal

Fri, 1 May - Wed, 6 May

08:40 - 09:10PWM-LHR

19h 30m1 stop

08:00 - 18:50LHR-PWM

15h 50m1 stop

£545Austrian Airlines

Find Deal

Fri, 16 Jan - Fri, 23 Jan

06:17 - 09:30PWM-LCY

22h 13m2 stops

07:45 - 00:20LCY-PWM

21h 35m2 stops

£546KLM

Find Deal

Fri, 23 Jan - Tue, 27 Jan

17:30 - 11:15PWM-LHR

12h 45m1 stop

13:45 - 22:27LHR-PWM

13h 42m1 stop

£550American Airlines

Find Deal

Sun, 10 May - Sat, 16 May

17:30 - 11:15PWM-LHR

12h 45m1 stop

12:30 - 22:27LHR-PWM

14h 57m1 stop

£551American Airlines

Find Deal

Sun, 10 May - Sat, 16 May

Delta flights from Portland, Maine to London

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

Delta

16 Jan

PWM05:30Portland

19h 55m

1 stop

LHR06:25London Heathrow

23 Jan

LHR10:00London Heathrow

19h 20m

2 stops

PWM00:20Portland

£477

Find similar

Delta

23 Jan

PWM14:35Portland

10h 45m

1 stop

LHR06:20London Heathrow

27 Jan

LHR10:00London Heathrow

19h 20m

2 stops

PWM00:20Portland

£478

Find similar

Delta

23 Jan

PWM12:43Portland

13h 07m

2 stops

LHR06:50London Heathrow

27 Jan

LHR11:45London Heathrow

17h 35m

2 stops

PWM00:20Portland

£481

Find similar

KLM flights from Portland, Maine to London

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

KLM

16 Jan

PWM14:35Portland

14h 40m

1 stop

LHR10:15London Heathrow

23 Jan

LHR16:10London Heathrow

13h 10m

1 stop

PWM00:20Portland

£498

Find similar

KLM

23 Jan

PWM06:17Portland

22h 13m

2 stops

LCY09:30London City

27 Jan

LCY07:45London City

21h 35m

2 stops

PWM00:20Portland

£546

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 16/1

05:30-06:25

1 stop19h 55m

London Heathrow

Fri 23/1

10:00-00:20

2 stops19h 20m

£477

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 23/1

14:35-06:20

1 stop10h 45m

London Heathrow

Tue 27/1

08:40-00:20

2 stops20h 40m

£478

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 23/1

12:43-06:50

2 stops13h 07m

London Heathrow

Tue 27/1

11:45-00:20

2 stops17h 35m

£481

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 23/1

12:43-06:50

2 stops13h 07m

London Heathrow

Tue 27/1

11:45-00:20

2 stops17h 35m

£482

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 16/1

14:35-10:15

1 stop14h 40m

London Heathrow

Fri 23/1

16:10-00:20

1 stop13h 10m

£498

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 1/5

06:00-20:45

1 stop9h 45m

London Heathrow

Wed 6/5

08:15-23:36

1 stop20h 21m

£541

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 16/1

08:40-09:10

1 stop19h 30m

London Heathrow

Fri 23/1

08:00-18:50

1 stop15h 50m

£545

PortlandLondon

PWM - LCY

PWMLCY

Portland

Fri 23/1

06:17-09:30

2 stops22h 13m

London City

Tue 27/1

07:45-00:20

2 stops21h 35m

£546

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 10/5

17:30-11:15

1 stop12h 45m

London Heathrow

Sat 16/5

13:45-22:27

1 stop13h 42m

£550

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 10/5

17:30-11:15

1 stop12h 45m

London Heathrow

Sat 16/5

12:30-22:27

1 stop14h 57m

£551

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 October. Flight prices, which tend to average around £472, 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 £533.

What is the cheapest time of day to depart on your flight to London?

The cheapest time of day to fly to London is at midday when flights can be purchased for as low as £540. Flights in the morning are often more expensive, with an average ticket price of £571.

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

Direct flights	None

There are no direct flights from Portland, Maine to London. There are no popular flight routes from Portland, Maine to London.

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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.

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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.