Which airlines fly to London?

British Airways, Virgin Atlantic and JetBlue 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 40% 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.

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

KLM, Delta, and United Airlines 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.

£249 Cheap Flights from Portland to London in 2026

Q: What is the typical price of a round-trip flight between Portland, Maine and London?

Prices are currently low for flights on this route. Typical prices usually range from £699 to £570. The lowest price recently found on this route was £539.

1 adult

0 bags

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Find the cheapest flights from Portland, Maine to London

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

14:51 - 06:45

PWM

LHR

10h 54m

1 stop

09:55 - 23:09

LHR

PWM

18h 14m

2 stops

£539Delta

Wed, 6 May - Mon, 11 May

14:51 - 08:50

PWM

LHR

12h 59m

1 stop

11:45 - 00:43

LHR

PWM

17h 58m

2 stops

£540KLM

Mon, 4 May - Mon, 18 May

12:46 - 08:50

PWM

LHR

15h 04m

2 stops

11:45 - 00:43

LHR

PWM

17h 58m

2 stops

£543Delta

Wed, 6 May - Mon, 11 May

13:35 - 07:15

PWM

LHR

12h 40m

1 stop

13:25 - 22:23

LHR

PWM

13h 58m

1 stop

£544Delta

Wed, 14 Oct - Tue, 20 Oct

12:46 - 07:10

PWM

LHR

13h 24m

1 stop

12:50 - 00:43

LHR

PWM

16h 53m

1 stop

£545KLM

Wed, 6 May - Mon, 11 May

14:38 - 14:35

PWM

LHR

18h 57m

1 stop

06:30 - 23:12

LHR

PWM

21h 42m

2 stops

£551Delta

Fri, 8 May - Wed, 13 May

11:07 - 10:00

PWM

LGW

17h 53m

1 stop

14:00 - 09:12

LGW

PWM

24h 12m

1 stop

£558Multiple Airlines

Wed, 29 Jul - Fri, 28 Aug

11:07 - 10:00

PWM

LGW

17h 53m

1 stop

14:00 - 16:16

LGW

PWM

31h 16m

2 stops

£584Multiple Airlines

Wed, 29 Jul - Fri, 28 Aug

07:20 - 09:55

PWM

LGW

45h 35m

2 stops

17:35 - 23:03

LGW

PWM

34h 28m

2 stops

£675Turkish Airlines

Wed, 6 May - Mon, 11 May

07:20 - 09:55

PWM

LGW

45h 35m

2 stops

07:05 - 23:03

LGW

PWM

20h 58m

2 stops

£681Turkish Airlines

Wed, 6 May - Mon, 11 May

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KLM flights from Portland, Maine to London

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

KLM

4 May

PWM14:51Portland

12h 59m

1 stop

LHR08:50London Heathrow

18 May

LHR11:45London Heathrow

17h 58m

2 stops

PWM00:43Portland

£540

KLM

25 Apr

PWM14:51Portland

14h 29m

1 stop

LHR10:20London Heathrow

30 Apr

LHR11:45London Heathrow

18h 01m

1 stop

PWM00:46Portland

£544

KLM

6 May

PWM12:46Portland

13h 24m

1 stop

LHR07:10London Heathrow

11 May

LHR12:50London Heathrow

16h 53m

1 stop

PWM00:43Portland

£545

Delta flights from Portland, Maine to London

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

Delta

6 May

PWM14:51Portland

10h 54m

1 stop

LHR06:45London Heathrow

11 May

LHR09:55London Heathrow

18h 14m

2 stops

PWM23:09Portland

£539

Delta

26 Apr

PWM14:51Portland

14h 29m

1 stop

LHR10:20London Heathrow

3 May

LHR11:45London Heathrow

18h 01m

2 stops

PWM00:46Portland

£540

Delta

6 May

PWM12:46Portland

15h 04m

2 stops

LHR08:50London Heathrow

11 May

LHR11:45London Heathrow

17h 58m

2 stops

PWM00:43Portland

£543

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

14:51-06:45

1 stop10h 54m

London Heathrow

Mon 11/5

09:55-23:09

2 stops18h 14m

£539

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 4/5

14:51-08:50

1 stop12h 59m

London Heathrow

Mon 18/5

11:45-00:43

2 stops17h 58m

£540

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

12:46-08:50

2 stops15h 04m

London Heathrow

Mon 11/5

11:45-00:43

2 stops17h 58m

£543

Fastest return journey

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 14/10

13:35-07:15

1 stop12h 40m

London Heathrow

Tue 20/10

13:25-22:23

1 stop13h 58m

£544

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

12:46-07:10

1 stop13h 24m

London Heathrow

Mon 11/5

12:50-00:43

1 stop16h 53m

£545

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 8/5

14:38-14:35

1 stop18h 57m

London Heathrow

Wed 13/5

06:30-23:12

2 stops21h 42m

£551

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 29/7

11:07-10:00

1 stop17h 53m

London Gatwick

Fri 28/8

14:00-09:12

1 stop24h 12m

£558

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 29/7

11:07-10:00

1 stop17h 53m

London Gatwick

Fri 28/8

14:00-16:16

2 stops31h 16m

£584

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 6/5

07:20-09:55

2 stops45h 35m

London Gatwick

Mon 11/5

17:35-23:03

2 stops34h 28m

£675

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 6/5

07:20-09:55

2 stops45h 35m

London Gatwick

Mon 11/5

07:05-23:03

2 stops20h 58m

£681

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 typical price of a round-trip flight between Portland, Maine and London?

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

You could potentially save up to 26% 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

Fastest flight time	10h 42m
Direct flights	None

The fastest flight from Portland, Maine to London takes 10h 42m

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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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 42m 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

Slough

Maidstone

Wembley

Southend-on-Sea

Ipswich

Canterbury

Ilford

Guildford

Hayes

Dover

Chelmsford

Folkestone

Chichester

Bedford

Ramsgate

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.

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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 2/9. 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

Delta flights from Portland, Maine to London

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

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Use the filters below to find and compare flights from Portland, Maine to London that are best for you.

See travel insights to London from

How to get the cheapest flight ticket from Portland, Maine to London

What is the typical price of a round-trip flight between Portland, Maine and 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

Find info about flight duration, direct flights, and airports for your flight from Portland, Maine to London

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

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

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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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