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

United Airlines, Air Canada, and JetBlue 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 38% 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.

£164 Cheap Flights from Portland to London in 2026

1 adult

0 bags

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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.

14:35 - 09:20

PWM

LHR

13h 45m

1 stop

08:40 - 23:59

LHR

PWM

19h 19m

2 stops

£452Delta

Wed, 25 Feb - Mon, 16 Mar

14:35 - 10:15

PWM

LHR

14h 40m

1 stop

14:45 - 13:50

LHR

PWM

27h 05m

2 stops

£453Delta

Wed, 4 Mar - Tue, 24 Mar

07:00 - 06:35

PWM

LHR

18h 35m

1 stop

13:10 - 22:59

LHR

PWM

13h 49m

1 stop

£454Multiple Airlines

Wed, 4 Mar - Tue, 24 Mar

12:13 - 11:40

PWM

LHR

18h 27m

2 stops

08:40 - 23:59

LHR

PWM

19h 19m

2 stops

£456Delta

Wed, 25 Feb - Mon, 16 Mar

05:31 - 07:05

PWM

LHR

20h 34m

2 stops

14:45 - 13:50

LHR

PWM

27h 05m

2 stops

£456Delta

Wed, 4 Mar - Tue, 24 Mar

16:48 - 08:45

PWM

LHR

11h 57m

1 stop

08:40 - 23:23

LHR

PWM

19h 43m

2 stops

£461Scandinavian Airlines

Mon, 16 Mar - Tue, 14 Apr

15:05 - 06:20

PWM

LHR

10h 15m

1 stop

06:50 - 18:25

LHR

PWM

16h 35m

2 stops

£464United Airlines

Sat, 28 Feb - Sat, 7 Mar

14:30 - 08:50

PWM

LHR

13h 20m

1 stop

16:05 - 00:46

LHR

PWM

13h 41m

1 stop

£466KLM

Tue, 31 Mar - Tue, 14 Apr

06:00 - 21:20

PWM

LHR

10h 20m

1 stop

12:05 - 23:20

LHR

PWM

16h 15m

2 stops

£470United Airlines

Thu, 12 Feb - Thu, 19 Feb

09:47 - 10:00

PWM

LGW

20h 13m

1 stop

14:00 - 10:17

LGW

PWM

25h 17m

1 stop

£614Multiple Airlines

Mon, 16 Mar - Tue, 14 Apr

Delta flights from Portland, Maine to London

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

Delta

25 Feb

PWM14:35Portland

13h 45m

1 stop

LHR09:20London Heathrow

16 Mar

LHR08:40London Heathrow

19h 19m

2 stops

PWM23:59Portland

£452

Delta

4 Mar

PWM14:35Portland

14h 40m

1 stop

LHR10:15London Heathrow

24 Mar

LHR14:45London Heathrow

27h 05m

2 stops

PWM13:50Portland

£453

Delta

25 Feb

PWM12:13Portland

18h 27m

2 stops

LHR11:40London Heathrow

16 Mar

LHR08:40London Heathrow

19h 19m

2 stops

PWM23:59Portland

£456

Scandinavian Airlines flights from Portland, Maine to London

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

Scandinavian Airlines

16 Mar

PWM16:48Portland

11h 57m

1 stop

LHR08:45London Heathrow

14 Apr

LHR08:40London Heathrow

19h 43m

2 stops

PWM23:23Portland

£461

Scandinavian Airlines

16 Mar

PWM14:30Portland

21h 55m

3 stops

LHR16:25London Heathrow

14 Apr

LHR07:05London Heathrow

22h 41m

2 stops

PWM00:46Portland

£553

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 25/2

14:35-09:20

1 stop13h 45m

London Heathrow

Mon 16/3

08:40-23:59

2 stops19h 19m

£452

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 4/3

14:35-10:15

1 stop14h 40m

London Heathrow

Tue 24/3

14:45-13:50

2 stops27h 05m

£453

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 4/3

07:00-06:35

1 stop18h 35m

London Heathrow

Tue 24/3

13:10-22:59

1 stop13h 49m

£454

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 25/2

12:13-11:40

2 stops18h 27m

London Heathrow

Mon 16/3

08:40-23:59

2 stops19h 19m

£456

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 4/3

05:31-07:05

2 stops20h 34m

London Heathrow

Tue 24/3

14:45-13:50

2 stops27h 05m

£456

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 16/3

16:48-08:45

1 stop11h 57m

London Heathrow

Tue 14/4

08:40-23:23

2 stops19h 43m

£461

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 28/2

15:05-06:20

1 stop10h 15m

London Heathrow

Sat 7/3

06:50-18:25

2 stops16h 35m

£464

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 31/3

14:30-08:50

1 stop13h 20m

London Heathrow

Tue 14/4

16:05-00:46

1 stop13h 41m

£466

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 12/2

06:00-21:20

1 stop10h 20m

London Heathrow

Thu 19/2

12:05-23:20

2 stops16h 15m

£470

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 16/3

09:47-10:00

1 stop20h 13m

London Gatwick

Tue 14/4

14:00-10:17

1 stop25h 17m

£614

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 £447, 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 £521.

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 20m
Direct flights	None

The fastest flight from Portland, Maine to London takes 10h 20m

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

Search flight deals

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 20m 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

Luton

Milton Keynes

Gatwick

Maidstone

Slough

Southend-on-Sea

Canterbury

Ipswich

Ilford

Guildford

Chelmsford

Hayes

Dover

Worthing

Hounslow

Bedford

Ramsgate

Colchester

Folkestone

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.