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Cheap flights from Portland, Maine to London from £256

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 3/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags
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Find the cheapest flights from Portland, Maine to London

Cheap return flights

Enter your travel dates to find the best prices.
United Airlines Logo
06:00 - 21:20
PWM
-
LHR
10h 20m
1 stop
United Airlines Logo
06:50 - 18:25
LHR
-
PWM
15h 35m
2 stops
£466United Airlines
Sat, 7 Mar - Tue, 10 Mar
United Airlines Logo
06:00 - 21:20
PWM
-
LHR
11h 20m
1 stop
United Airlines Logo
13:30 - 14:32
LHR
-
PWM
29h 02m
2 stops
£474United Airlines
Sat, 21 Mar - Tue, 24 Mar
Delta Logo
05:23 - 06:45
PWM
-
LHR
20h 22m
1 stop
Delta Logo
09:55 - 15:57
LHR
-
PWM
35h 02m
2 stops
£478Delta
Mon, 6 Apr - Mon, 27 Apr
United Airlines Logo
09:39 - 08:30
PWM
-
LHR
17h 51m
1 stop
United Airlines Logo
17:50 - 18:23
LHR
-
PWM
29h 33m
2 stops
£487United Airlines
Wed, 6 May - Mon, 11 May
United Airlines Logo
15:39 - 08:20
PWM
-
LHR
11h 41m
1 stop
United Airlines Logo
17:50 - 18:23
LHR
-
PWM
29h 33m
2 stops
£488United Airlines
Wed, 6 May - Mon, 11 May
Delta Logo
06:25 - 20:10
PWM
-
LHR
9h 45m
1 stop
Delta Logo
17:35 - 13:50
LHR
-
PWM
25h 15m
2 stops
£504Delta
Thu, 26 Mar - Mon, 30 Mar
Turkish Airlines Logo
06:00 - 09:55
PWM
-
LGW
22h 55m
2 stops
Turkish Airlines Logo
14:05 - 23:36
LGW
-
PWM
38h 31m
2 stops
£883Turkish Airlines
Wed, 6 May - Mon, 11 May
Multiple Airlines Logo
11:01 - 09:45
PWM
-
LGW
41h 44m
2 stops
Multiple Airlines Logo
14:00 - 09:07
LGW
-
PWM
23h 07m
1 stop
£960Multiple Airlines
Thu, 5 Mar - Thu, 12 Mar
Multiple Airlines Logo
09:47 - 10:00
PWM
-
LGW
20h 13m
1 stop
Multiple Airlines Logo
12:40 - 23:12
LGW
-
PWM
15h 32m
2 stops
£967Multiple Airlines
Mon, 23 Mar - Mon, 30 Mar
Turkish Airlines Logo
06:00 - 22:25
PWM
-
LGW
35h 25m
2 stops
Turkish Airlines Logo
14:05 - 23:36
LGW
-
PWM
38h 31m
2 stops
£1,472Turkish Airlines
Wed, 6 May - Mon, 11 May

Air Canada flights from Portland, Maine to London

Our best Air Canada deals on Portland, Maine to London flight tickets
Air Canada
10 May
PWM06:00Portland
23h 00m
2 stops
LHR10:00London Heathrow
16 May
LHR09:30London Heathrow
18h 59m
2 stops
PWM23:29Portland
£543
Air Canada
27 Mar
PWM19:09Portland
30h 21m
2 stops
LHR05:30London Heathrow
11 Apr
LHR09:30London Heathrow
32h 55m
2 stops
PWM13:25Portland
£559
Air Canada
6 May
PWM11:08Portland
16h 27m
3 stops
LHR08:35London Heathrow
11 May
LHR08:30London Heathrow
19h 59m
3 stops
PWM23:29Portland
£604

KLM flights from Portland, Maine to London

Our best KLM deals on Portland, Maine to London flight tickets
KLM
23 Mar
PWM12:51Portland
15h 54m
1 stop
LHR08:45London Heathrow
30 Mar
LHR15:50London Heathrow
13h 09m
1 stop
PWM23:59Portland
£548
KLM
5 Mar
PWM12:13Portland
15h 32m
1 stop
LHR08:45London Heathrow
12 Mar
LHR10:45London Heathrow
16h 37m
1 stop
PWM23:22Portland
£615
KLM
11 Feb
PWM06:17Portland
20h 48m
1 stop
LHR08:05London Heathrow
16 Feb
LHR12:30London Heathrow
15h 36m
1 stop
PWM23:06Portland
£646

momondo Fare Finder

 
Customise your flight search to find flights from Portland, Maine to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 7 February 2026.
Use the filters below to find and compare flights from Portland, Maine to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 7/3

06:00-21:20

1 stop10h 20m

London Heathrow

Tue 10/3

06:50-18:25

2 stops15h 35m

£466

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 21/3

06:00-21:20

1 stop11h 20m

London Heathrow

Tue 24/3

13:30-14:32

2 stops29h 02m

£474

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 6/4

05:23-06:45

1 stop20h 22m

London Heathrow

Mon 27/4

09:55-15:57

2 stops35h 02m

£478

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

09:39-08:30

1 stop17h 51m

London Heathrow

Mon 11/5

17:50-18:23

2 stops29h 33m

£487

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

15:39-08:20

1 stop11h 41m

London Heathrow

Mon 11/5

17:50-18:23

2 stops29h 33m

£488

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 26/3

06:25-20:10

1 stop9h 45m

London Heathrow

Mon 30/3

17:35-13:50

2 stops25h 15m

£504

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 6/5

06:00-09:55

2 stops22h 55m

London Gatwick

Mon 11/5

14:05-23:36

2 stops38h 31m

£883

PortlandLondon

PWM - LGW

PWMLGW

Portland

Thu 5/3

11:01-09:45

2 stops41h 44m

London Gatwick

Thu 12/3

14:00-09:07

1 stop23h 07m

£960

PortlandLondon

PWM - LGW

PWMLGW

Portland

Mon 23/3

09:47-10:00

1 stop20h 13m

London Gatwick

Mon 30/3

12:40-23:12

2 stops15h 32m

£967

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 6/5

06:00-22:25

2 stops35h 25m

London Gatwick

Mon 11/5

14:05-23:36

2 stops38h 31m

£1,472

Flights are sorted by cheapest return flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
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See travel insights to London from

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

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 £441, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Portland, Maine averaging around £495.

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.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Maidstone
Slough
Southend-on-Sea
Canterbury
Ipswich
Ilford
Guildford
Chelmsford
Hayes
Dover
Folkestone
Bedford
Colchester
Wembley
Worthing
Ramsgate

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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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
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport