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 39% 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.

£450 Cheap Flights from Portland to London in 2025/26

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Find the cheapest flights from Portland, Maine to London

Round-trip

One-way

Last minute

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Enter your travel dates to find the best prices.

08:40 - 20:35

PWM

LHR

30h 55m1 stop

12:00 - 18:50

LHR

PWM

11h 50m1 stop

£450Austrian Airlines

Thu, 15 Jan - Thu, 22 Jan

09:47 - 10:00

PWM

LGW

19h 13m1 stop

14:00 - 10:17

LGW

PWM

25h 17m1 stop

£461Multiple Airlines

Mon, 30 Mar - Tue, 14 Apr

14:31 - 06:40

PWM

LHR

11h 09m1 stop

06:50 - 18:50

LHR

PWM

17h 00m2 stops

£470United Airlines

Thu, 15 Jan - Thu, 22 Jan

15:12 - 10:50

PWM

LHR

14h 38m2 stops

12:05 - 23:30

LHR

PWM

16h 25m2 stops

£473United Airlines

Thu, 15 Jan - Thu, 22 Jan

06:00 - 21:20

PWM

LHR

10h 20m1 stop

13:25 - 18:50

LHR

PWM

34h 25m2 stops

£476United Airlines

Wed, 21 Jan - Sun, 25 Jan

09:47 - 10:00

PWM

LGW

19h 13m1 stop

14:00 - 09:07

LGW

PWM

24h 07m1 stop

£478Multiple Airlines

Mon, 30 Mar - Thu, 16 Apr

19:27 - 07:10

PWM

LHR

30h 43m2 stops

13:25 - 18:50

LHR

PWM

34h 25m2 stops

£479Air Canada

Wed, 21 Jan - Sun, 25 Jan

06:00 - 07:10

PWM

LHR

20h 10m2 stops

18:00 - 18:50

LHR

PWM

29h 50m2 stops

£482Air Canada

Sat, 31 Jan - Sat, 7 Feb

14:30 - 07:15

PWM

LHR

11h 45m1 stop

06:30 - 22:03

LHR

PWM

20h 33m2 stops

£482Delta

Tue, 31 Mar - Tue, 14 Apr

16:50 - 13:10

PWM

LHR

15h 20m2 stops

09:55 - 23:59

LHR

PWM

19h 04m2 stops

£485Delta

Tue, 31 Mar - Tue, 14 Apr

Austrian Airlines flights from Portland, Maine to London

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

Austrian Airlines

15 Jan

PWM08:40Portland

30h 55m

1 stop

LHR20:35London Heathrow

22 Jan

LHR12:00London Heathrow

11h 50m

1 stop

PWM18:50Portland

£450

Find similar

Austrian Airlines

31 Jan

PWM08:40Portland

19h 30m

1 stop

LHR09:10London Heathrow

7 Feb

LHR09:10London Heathrow

19h 20m

1 stop

PWM23:30Portland

£490

Find similar

United Airlines flights from Portland, Maine to London

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

United Airlines

15 Jan

PWM14:31Portland

11h 09m

1 stop

LHR06:40London Heathrow

22 Jan

LHR06:50London Heathrow

17h 00m

2 stops

PWM18:50Portland

£470

Find similar

United Airlines

15 Jan

PWM15:12Portland

14h 38m

2 stops

LHR10:50London Heathrow

22 Jan

LHR12:05London Heathrow

16h 25m

2 stops

PWM23:30Portland

£473

Find similar

United Airlines

21 Jan

PWM06:00Portland

10h 20m

1 stop

LHR21:20London Heathrow

25 Jan

LHR13:25London Heathrow

34h 25m

2 stops

PWM18:50Portland

£476

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 15/1

08:40-20:35

1 stop30h 55m

London Heathrow

Thu 22/1

12:00-18:50

1 stop11h 50m

£450

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 30/3

09:47-10:00

1 stop19h 13m

London Gatwick

Tue 14/4

14:00-10:17

1 stop25h 17m

£461

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 15/1

14:31-06:40

1 stop11h 09m

London Heathrow

Thu 22/1

06:50-18:50

2 stops17h 00m

£470

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 15/1

15:12-10:50

2 stops14h 38m

London Heathrow

Thu 22/1

12:05-23:30

2 stops16h 25m

£473

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 21/1

06:00-21:20

1 stop10h 20m

London Heathrow

Sun 25/1

13:25-18:50

2 stops34h 25m

£476

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 30/3

09:47-10:00

1 stop19h 13m

London Gatwick

Thu 16/4

14:00-09:07

1 stop24h 07m

£478

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 21/1

19:27-07:10

2 stops30h 43m

London Heathrow

Sun 25/1

13:25-18:50

2 stops34h 25m

£479

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 31/1

06:00-07:10

2 stops20h 10m

London Heathrow

Sat 7/2

18:00-18:50

2 stops29h 50m

£482

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 31/3

14:30-07:15

1 stop11h 45m

London Heathrow

Tue 14/4

06:30-22:03

2 stops20h 33m

£482

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 31/3

16:50-13:10

2 stops15h 20m

London Heathrow

Tue 14/4

09:55-23:59

2 stops19h 04m

£485

Flights are sorted by cheapest return flights first.

Sorted 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 £463, 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.

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

Our data shows that Monday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £471. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Portland, Maine to London for around £597.

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

The cheapest time of day to fly to London is in the evening when flights can be purchased for as low as £505. Flights in the morning are often more expensive, with an average ticket price of £547.

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

Fastest flight time	9h 38m
Direct flights	None

The fastest flight from Portland, Maine to London takes 9h 38m

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 38m 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

Milton Keynes

Luton

Gatwick

Maidstone

Slough

Southend-on-Sea

Canterbury

Ipswich

Ilford

Guildford

Hayes

Chelmsford

Dover

Worthing

Colchester

Bedford

Ramsgate

Hounslow

Stansted

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.