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Cheap flights from Portland, Maine to London from £250

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 9/10. 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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Cheap return flights

JetBlue Logo
14:17 - 20:45PWM-LHR
25h 28m1 stop
JetBlue Logo
11:55 - 22:01LHR-PWM
15h 06m1 stop
£474JetBlue
Find Deal
Tue, 30 Sep - Tue, 7 Oct
JetBlue Logo
14:17 - 20:45PWM-LHR
25h 28m1 stop
JetBlue Logo
08:15 - 22:02LHR-PWM
18h 47m1 stop
£499JetBlue
Find Deal
Fri, 17 Oct - Fri, 24 Oct
United Airlines Logo
08:00 - 06:30PWM-LHR
17h 30m2 stops
United Airlines Logo
08:40 - 23:59LHR-PWM
20h 19m2 stops
£540United Airlines
Find Deal
Wed, 1 Oct - Wed, 8 Oct
United Airlines Logo
15:15 - 10:40PWM-LHR
14h 25m2 stops
United Airlines Logo
13:45 - 23:13LHR-PWM
14h 28m2 stops
£544United Airlines
Find Deal
Tue, 30 Sep - Tue, 7 Oct
Logo
08:00 - 06:30PWM-LHR
17h 30m3 stops
Logo
14:05 - 23:13LHR-PWM
14h 08m2 stops
£559
Find Deal
Tue, 30 Sep - Tue, 7 Oct
Air Canada Logo
08:00 - 06:30PWM-LHR
17h 30m3 stops
Air Canada Logo
08:30 - 23:13LHR-PWM
19h 43m3 stops
£563Air Canada
Find Deal
Tue, 30 Sep - Tue, 7 Oct
Scandinavian Airlines Logo
06:50 - 09:35PWM-LHR
21h 45m2 stops
Scandinavian Airlines Logo
07:05 - 00:05LHR-PWM
22h 00m2 stops
£572Scandinavian Airlines
Find Deal
Fri, 17 Oct - Fri, 24 Oct
Scandinavian Airlines Logo
06:33 - 09:35PWM-LHR
22h 02m2 stops
Scandinavian Airlines Logo
06:40 - 00:34LHR-PWM
22h 54m2 stops
£583Scandinavian Airlines
Find Deal
Sat, 13 Sep - Sat, 20 Sep
Air Canada Logo
08:00 - 06:30PWM-LHR
17h 30m3 stops
Air Canada Logo
08:30 - 23:13LHR-PWM
19h 43m3 stops
£600Air Canada
Find Deal
Fri, 17 Oct - Fri, 24 Oct
Logo
14:38 - 08:50PWM-LHR
13h 12m1 stop
Logo
16:05 - 00:05LHR-PWM
13h 00m1 stop
£635
Find Deal
Fri, 10 Oct - Mon, 20 Oct

Delta flights from Portland, Maine to London Heathrow Airport

Our best Delta deals on Portland, Maine to London Heathrow Airport flight tickets
Delta
25 Nov
PWM14:35Portland
10h 45m
1 stop
LHR06:20London Heathrow
30 Nov
LHR08:50London Heathrow
20h 01m
1 stop
PWM23:51Portland
£646
Find similar
Delta
9 Oct
PWM14:38Portland
14h 52m
2 stops
LHR10:30London Heathrow
18 Oct
LHR09:20London Heathrow
17h 59m
1 stop
PWM22:19Portland
£650
Find similar
Delta
10 Oct
PWM14:38Portland
15h 07m
2 stops
LHR10:45London Heathrow
19 Oct
LHR11:45London Heathrow
17h 20m
2 stops
PWM00:05Portland
£673
Find similar

JetBlue flights from Portland, Maine to London Heathrow Airport

Our best JetBlue deals on Portland, Maine to London Heathrow Airport flight tickets
JetBlue
30 Sept
PWM14:17Portland
25h 28m
1 stop
LHR20:45London Heathrow
7 Oct
LHR11:55London Heathrow
15h 06m
1 stop
PWM22:01Portland
£474
Find similar
JetBlue
17 Oct
PWM14:17Portland
25h 28m
1 stop
LHR20:45London Heathrow
24 Oct
LHR08:15London Heathrow
18h 47m
1 stop
PWM22:02Portland
£499
Find similar
JetBlue
10 Oct
PWM07:09Portland
21h 21m
1 stop
LHR09:30London Heathrow
19 Oct
LHR08:15London Heathrow
18h 47m
1 stop
PWM22:02Portland
£521
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Portland, Maine to London Heathrow Airport 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 18 August 2025.
Use the filters below to find and compare flights from Portland, Maine to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 30/9

14:17-20:45

1 stop25h 28m

London Heathrow

Tue 7/10

11:55-22:01

1 stop15h 06m

£474

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 17/10

14:17-20:45

1 stop25h 28m

London Heathrow

Fri 24/10

08:15-22:02

1 stop18h 47m

£499

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/10

08:00-06:30

2 stops17h 30m

London Heathrow

Wed 8/10

08:40-23:59

2 stops20h 19m

£540

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 30/9

15:15-10:40

2 stops14h 25m

London Heathrow

Tue 7/10

13:45-23:13

2 stops14h 28m

£544

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 30/9

08:00-06:30

3 stops17h 30m

London Heathrow

Tue 7/10

14:05-23:13

2 stops14h 08m

£559

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 30/9

08:00-06:30

3 stops17h 30m

London Heathrow

Tue 7/10

08:30-23:13

3 stops19h 43m

£563

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 17/10

06:50-09:35

2 stops21h 45m

London Heathrow

Fri 24/10

07:05-00:05

2 stops22h 00m

£572

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 13/9

06:33-09:35

2 stops22h 02m

London Heathrow

Sat 20/9

06:40-00:34

2 stops22h 54m

£583

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 17/10

08:00-06:30

3 stops17h 30m

London Heathrow

Fri 24/10

08:30-23:13

3 stops19h 43m

£600

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 10/10

14:38-08:50

1 stop13h 12m

London Heathrow

Mon 20/10

16:05-00:05

1 stop13h 00m

£635

Flights are sorted by cheapest return flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Portland, Maine to London Heathrow Airport

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

What is the cheapest month to fly to London Heathrow Airport?

In general, April is the cheapest month to fly from Portland, Maine to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £524. The month of May is another great option to travel to London Heathrow Airport, with average flight prices from Portland, Maine averaging around £553.

When to book flights from Portland, Maine to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Portland, Maine to London Heathrow Airport (PWM to LHR) flight deals and tips

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

Best price found

£250

Fastest flight time

10h 00m

Direct flights

None
The best one-way flight to London Heathrow Airport from Portland, Maine in the past 72 hours is £250. The best return flight deal from Portland, Maine to London Heathrow Airport found on momondo in the last 72 hours is £474.
The fastest flight from Portland, Maine to London Heathrow Airport takes 10h 00m
There are no direct flights from Portland, Maine to London Heathrow Airport. Popular non-direct route for this connection is Portland Airport - London Heathrow Airport.
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  • How far is Portland to London Heathrow by plane?

    London Heathrow is 3170.3 mi away from Portland. In terms of flight time, this usually takes a little over 10h 00m.

  • When did momondo last update prices for flights from Portland Airport to London Heathrow Airport?

    Prices for flights from Portland Airport to London Heathrow Airport refresh daily.

  • How old do you have to be to fly from Portland Airport to London Heathrow Airport?

    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 Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The necessary travel and health documents for your London Heathrow Airport 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.

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Dartford
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Why use momondo?

Why should I use momondo to find a flight deal from Portland to London?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Portland.

Can I find flights from Portland to London with flexible booking policies on momondo?

Yes. All flights to London from Portland on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Portland to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Portland to London.

I’m not ready to book a flight from Portland to London right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Portland to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

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