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Cheap flights from Portland, Maine to London from £326

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 28/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
Delta Logo
13:25 - 09:00PWM-LHR
14h 35m1 stop
Delta Logo
11:45 - 23:59LHR-PWM
17h 14m2 stops
£536Delta
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週一, 1 12月 - 週三, 10 12月
Delta Logo
16:43 - 11:25PWM-LHR
13h 42m2 stops
Delta Logo
10:00 - 23:21LHR-PWM
18h 21m2 stops
£539Delta
Find Deal
週三, 3 12月 - 週三, 10 12月
Delta Logo
06:30 - 06:55PWM-LHR
20h 25m1 stop
Delta Logo
09:55 - 23:49LHR-PWM
18h 54m2 stops
£579Delta
Find Deal
週五, 27 3月 - 週二, 31 3月
KLM Logo
16:50 - 08:45PWM-LHR
11h 55m1 stop
KLM Logo
11:45 - 23:59LHR-PWM
17h 14m2 stops
£591KLM
Find Deal
週日, 22 3月 - 週日, 3 5月
Delta Logo
14:34 - 06:20PWM-LHR
10h 46m1 stop
Delta Logo
16:10 - 23:59LHR-PWM
12h 49m1 stop
£594Delta
Find Deal
週四, 4 12月 - 週四, 11 12月
American Airlines Logo
12:36 - 06:35PWM-LHR
12h 59m1 stop
American Airlines Logo
07:50 - 18:13LHR-PWM
15h 23m2 stops
£608American Airlines
Find Deal
週四, 4 12月 - 週一, 8 12月
American Airlines Logo
12:23 - 06:30PWM-LHR
13h 07m2 stops
American Airlines Logo
07:50 - 18:13LHR-PWM
15h 23m2 stops
£611American Airlines
Find Deal
週四, 4 12月 - 週一, 8 12月
Virgin Atlantic Logo
06:03 - 09:00PWM-LHR
21h 57m1 stop
Virgin Atlantic Logo
08:55 - 22:23LHR-PWM
18h 28m1 stop
£631Virgin Atlantic
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週四, 4 12月 - 週一, 8 12月
Multiple Airlines Logo
05:47 - 06:35PWM-LHR
19h 48m1 stop
Multiple Airlines Logo
10:05 - 22:32LHR-PWM
17h 27m1 stop
£637Multiple Airlines
Find Deal
週五, 13 2月 - 週日, 22 2月
Multiple Airlines Logo
16:48 - 11:20PWM-LHR
14h 32m2 stops
Multiple Airlines Logo
08:30 - 21:27LHR-PWM
17h 57m3 stops
£659Multiple Airlines
Find Deal
週日, 22 3月 - 週日, 3 5月

Delta flights from Portland, Maine to London Heathrow Airport

Our best Delta deals on Portland, Maine to London Heathrow Airport flight tickets
Delta
1 Dec
PWM13:25Portland
14h 35m
1 stop
LHR09:00London Heathrow
10 Dec
LHR11:45London Heathrow
17h 14m
2 stops
PWM23:59Portland
£536
Find similar
Delta
3 Dec
PWM16:43Portland
13h 42m
2 stops
LHR11:25London Heathrow
10 Dec
LHR10:00London Heathrow
18h 21m
2 stops
PWM23:21Portland
£539
Find similar
Delta
27 Mar
PWM06:30Portland
20h 25m
1 stop
LHR06:55London Heathrow
31 Mar
LHR09:55London Heathrow
18h 54m
2 stops
PWM23:49Portland
£579
Find similar

American Airlines flights from Portland, Maine to London Heathrow Airport

Our best American Airlines deals on Portland, Maine to London Heathrow Airport flight tickets
American Airlines
4 Dec
PWM12:36Portland
12h 59m
1 stop
LHR06:35London Heathrow
8 Dec
LHR07:50London Heathrow
15h 23m
2 stops
PWM18:13Portland
£608
Find similar
American Airlines
4 Dec
PWM12:23Portland
13h 07m
2 stops
LHR06:30London Heathrow
8 Dec
LHR07:50London Heathrow
15h 23m
2 stops
PWM18:13Portland
£611
Find similar
American Airlines
22 Mar
PWM16:11Portland
11h 39m
1 stop
LHR07:50London Heathrow
3 May
LHR12:30London Heathrow
14h 57m
1 stop
PWM22:27Portland
£612
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 3 10月 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

週一 1/12

13:25-09:00

1 stop14h 35m

London Heathrow

週三 10/12

11:45-23:59

2 stops17h 14m

£536

PortlandLondon

PWM - LHR

PWMLHR

Portland

週三 3/12

16:43-11:25

2 stops13h 42m

London Heathrow

週三 10/12

10:00-23:21

2 stops18h 21m

£539

PortlandLondon

PWM - LHR

PWMLHR

Portland

週五 27/3

06:30-06:55

1 stop20h 25m

London Heathrow

週二 31/3

09:55-23:49

2 stops18h 54m

£579

PortlandLondon

PWM - LHR

PWMLHR

Portland

週日 22/3

16:50-08:45

1 stop11h 55m

London Heathrow

週日 3/5

11:45-23:59

2 stops17h 14m

£591

PortlandLondon

PWM - LHR

PWMLHR

Portland

週四 4/12

14:34-06:20

1 stop10h 46m

London Heathrow

週四 11/12

16:10-23:59

1 stop12h 49m

£594

PortlandLondon

PWM - LHR

PWMLHR

Portland

週四 4/12

12:36-06:35

1 stop12h 59m

London Heathrow

週一 8/12

07:50-18:13

2 stops15h 23m

£608

PortlandLondon

PWM - LHR

PWMLHR

Portland

週四 4/12

12:23-06:30

2 stops13h 07m

London Heathrow

週一 8/12

07:50-18:13

2 stops15h 23m

£611

PortlandLondon

PWM - LHR

PWMLHR

Portland

週四 4/12

06:03-09:00

1 stop21h 57m

London Heathrow

週一 8/12

08:55-22:23

1 stop18h 28m

£631

PortlandLondon

PWM - LHR

PWMLHR

Portland

週五 13/2

05:47-06:35

1 stop19h 48m

London Heathrow

週日 22/2

10:05-22:32

1 stop17h 27m

£637

PortlandLondon

PWM - LHR

PWMLHR

Portland

週日 22/3

16:48-11:20

2 stops14h 32m

London Heathrow

週日 3/5

08:30-21:27

3 stops17h 57m

£659

Flights are sorted by cheapest return flights first.

Showing 1-10 of 14 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 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, May 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 £517. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Portland, Maine averaging around £527.

What is the cheapest day to depart on your flight to London Heathrow Airport?

On average, the least expensive day to fly to London Heathrow Airport from Portland, Maine is on a Monday. momondo users have found tickets for Monday departures for as low as £477. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £576.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from Portland, Maine to London Heathrow Airport in the evening for as low as £501. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £625 on average. Flights to London Heathrow Airport from Portland, Maine in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

Direct flights

None
There are no direct flights from Portland, Maine to London Heathrow Airport. There are no popular flight routes from Portland, Maine to 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 9h 40m.

  • 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.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Maidstone
Gatwick
Slough
Northampton
Swindon
Canterbury
Stratford-upon-Avon
Southend-on-Sea
Ipswich
Ilford
Guildford
Poole
Swanage
Colchester
Worthing
Hayes
Dover

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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