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

Delta, United Airlines, and WestJet are the most popular carriers operating from Portland to London

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 43% 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.

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.

£245 Cheap Flights from Portland, Maine 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 £750 to £880. The lowest price recently found on this route was £550.

Find the cheapest flights from Portland, Maine to London

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

06:00 - 20:45

PWM

LHR

9h 45m

1 stop

11:55 - 23:52

LHR

PWM

16h 57m

1 stop

£594JetBlue

Wed, 16 Sep - Wed, 23 Sep

06:00 - 08:30

PWM

LHR

21h 30m

2 stops

07:25 - 23:43

LHR

PWM

21h 18m

1 stop

£607Multiple Airlines

Mon, 2 Nov - Mon, 9 Nov

06:00 - 20:45

PWM

LHR

9h 45m

1 stop

08:15 - 12:30

LHR

PWM

33h 15m

1 stop

£624JetBlue

Mon, 24 Aug - Mon, 31 Aug

14:53 - 08:50

PWM

LHR

12h 57m

1 stop

11:45 - 00:59

LHR

PWM

18h 14m

2 stops

£640KLM

Mon, 17 Aug - Wed, 2 Sep

11:08 - 10:00

PWM

LGW

17h 52m

1 stop

14:00 - 19:34

LGW

PWM

34h 34m

1 stop

£644Multiple Airlines

Wed, 16 Sep - Wed, 23 Sep

10:48 - 06:20

PWM

LHR

14h 32m

1 stop

06:50 - 16:09

LHR

PWM

14h 19m

2 stops

£645United Airlines

Tue, 10 Nov - Tue, 24 Nov

10:48 - 06:20

PWM

LHR

14h 32m

1 stop

06:50 - 16:09

LHR

PWM

14h 19m

2 stops

£646United Airlines

Tue, 10 Nov - Tue, 24 Nov

14:53 - 09:40

PWM

LGW

13h 47m

2 stops

10:25 - 23:13

LGW

PWM

17h 48m

2 stops

£714Delta

Mon, 31 Aug - Mon, 7 Sep

11:50 - 09:40

PWM

LGW

16h 50m

2 stops

10:25 - 00:59

LGW

PWM

19h 34m

2 stops

£716Delta

Mon, 17 Aug - Mon, 24 Aug

06:00 - 07:15

PWM

LCY

20h 15m

2 stops

10:00 - 00:59

LCY

PWM

19h 59m

2 stops

£756KLM

Thu, 6 Aug - Thu, 13 Aug

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

Scandinavian Airlines flights from Portland, Maine to London

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

Scandinavian Airlines

5 Sept

PWM06:00Portland

22h 35m

2 stops

LHR09:35London Heathrow

10 Sept

LHR07:05London Heathrow

21h 51m

2 stops

PWM23:56Portland

£672

Scandinavian Airlines

18 Oct

PWM06:04Portland

22h 31m

2 stops

LHR09:35London Heathrow

24 Oct

LHR17:00London Heathrow

35h 49m

2 stops

PWM23:49Portland

£682

Scandinavian Airlines

18 Aug

PWM06:00Portland

22h 35m

2 stops

LHR09:35London Heathrow

25 Aug

LHR10:35London Heathrow

43h 24m

2 stops

PWM00:59Portland

£686

United Airlines flights from Portland, Maine to London

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

United Airlines

10 Nov

PWM10:48Portland

14h 32m

1 stop

LHR06:20London Heathrow

24 Nov

LHR06:50London Heathrow

14h 19m

2 stops

PWM16:09Portland

£645

United Airlines

10 Nov

PWM10:48Portland

14h 32m

1 stop

LHR06:20London Heathrow

24 Nov

LHR06:50London Heathrow

14h 19m

2 stops

PWM16:09Portland

£646

United Airlines

10 Nov

PWM14:23Portland

13h 47m

2 stops

LHR09:10London Heathrow

17 Nov

LHR06:50London Heathrow

14h 19m

2 stops

PWM16:09Portland

£649

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 16/9

06:00-20:45

1 stop9h 45m

London Heathrow

Wed 23/9

11:55-23:52

1 stop16h 57m

£594

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 2/11

06:00-08:30

2 stops21h 30m

London Heathrow

Mon 9/11

07:25-23:43

1 stop21h 18m

£607

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 24/8

06:00-20:45

1 stop9h 45m

London Heathrow

Mon 31/8

08:15-12:30

1 stop33h 15m

£624

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 17/8

14:53-08:50

1 stop12h 57m

London Heathrow

Wed 2/9

11:45-00:59

2 stops18h 14m

£640

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 16/9

11:08-10:00

1 stop17h 52m

London Gatwick

Wed 23/9

14:00-19:34

1 stop34h 34m

£644

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/11

10:48-06:20

1 stop14h 32m

London Heathrow

Tue 24/11

06:50-16:09

2 stops14h 19m

£645

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/11

10:48-06:20

1 stop14h 32m

London Heathrow

Tue 24/11

06:50-16:09

2 stops14h 19m

£646

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 31/8

14:53-09:40

2 stops13h 47m

London Gatwick

Mon 7/9

10:25-23:13

2 stops17h 48m

£714

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 17/8

11:50-09:40

2 stops16h 50m

London Gatwick

Mon 24/8

10:25-00:59

2 stops19h 34m

£716

PortlandLondon

PWM - LCY

PWMLCY

Portland

Thu 6/8

06:00-07:15

2 stops20h 15m

London City

Thu 13/8

10:00-00:59

2 stops19h 59m

£756

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?

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 £521.

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	9h 45m
Direct flights	None

The fastest flight from Portland, Maine to London takes 9h 45m

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 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.

Eastbourne

Wembley

Gatwick

Milton Keynes

Luton

Southend-on-Sea

Slough

Ipswich

Maidstone

Folkestone

Ilford

Hastings

Canterbury

Guildford

Chichester

Hayes

Bedford

Colchester

Harlow

Chelmsford

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.

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.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Fri 21/8

Fri 28/8

Email me momondo's favourite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Nearby airports

Airlines

Cabin classes

Other United Kingdom destinations

Complete your trip

Feeling lucky

Fly into one of these airports located in London

London City Airport

London Gatwick Airport

London Heathrow Airport

London Luton Airport

London Southend Airport

London Stansted Airport

Cheap flights from Portland, Maine to London from £245

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 7/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Portland, Maine to London

Cheap return flights

Cheap one-way flights

Cheap last-minute flights

Big names, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Scandinavian Airlines flights from Portland, Maine to London

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

United Airlines flights from Portland, Maine to London

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

momondo Fare Finder

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?

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

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

Cabin classes currently available on flights to London

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

Popular Cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo

Complete your trip to London

Explore popular destinations other users love

According to popular flight searches on momondo this year