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Cheap flights from Portland, Maine to London from £467

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to London departing on 16/1. 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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0 bags
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Cheap return flights

Enter your travel dates to find the best prices.
Austrian Airlines Logo
08:40 - 10:25
PWM
-
LHR
20h 45m1 stop
Austrian Airlines Logo
06:00 - 18:50
LHR
-
PWM
17h 50m2 stops
£467Austrian Airlines
Fri, 16 Jan - Fri, 23 Jan
Virgin Atlantic Logo
05:30 - 09:00
PWM
-
LHR
22h 30m1 stop
Virgin Atlantic Logo
06:30 - 22:27
LHR
-
PWM
20h 57m2 stops
£470Virgin Atlantic
Tue, 3 Feb - Tue, 10 Feb
United Airlines Logo
15:12 - 10:50
PWM
-
LHR
14h 38m2 stops
United Airlines Logo
06:50 - 18:50
LHR
-
PWM
17h 00m2 stops
£473United Airlines
Fri, 16 Jan - Fri, 23 Jan
Delta Logo
14:35 - 10:30
PWM
-
LHR
14h 55m2 stops
Delta Logo
08:40 - 00:20
LHR
-
PWM
20h 40m2 stops
£474Delta
Tue, 3 Feb - Tue, 10 Feb
Austrian Airlines Logo
08:40 - 10:25
PWM
-
LHR
20h 45m1 stop
Austrian Airlines Logo
08:00 - 18:50
LHR
-
PWM
15h 50m1 stop
£477Austrian Airlines
Fri, 16 Jan - Fri, 23 Jan
Air Canada Logo
06:00 - 07:10
PWM
-
LHR
20h 10m2 stops
Air Canada Logo
13:25 - 23:30
LHR
-
PWM
39h 05m2 stops
£479Air Canada
Wed, 21 Jan - Sun, 25 Jan
Delta Logo
12:50 - 08:55
PWM
-
LHR
15h 05m1 stop
Delta Logo
06:30 - 22:03
LHR
-
PWM
20h 33m2 stops
£482Delta
Tue, 31 Mar - Tue, 14 Apr
Delta Logo
16:50 - 13:30
PWM
-
LHR
15h 40m2 stops
Delta Logo
06:30 - 22:03
LHR
-
PWM
20h 33m2 stops
£485Delta
Tue, 31 Mar - Tue, 14 Apr
KLM Logo
12:10 - 08:45
PWM
-
LHR
15h 35m1 stop
KLM Logo
10:45 - 23:06
LHR
-
PWM
17h 21m1 stop
£491KLM
Wed, 11 Feb - Mon, 16 Feb
United Airlines Logo
11:12 - 06:40
PWM
-
LHR
14h 28m2 stops
United Airlines Logo
15:10 - 23:30
LHR
-
PWM
13h 20m1 stop
£494United Airlines
Wed, 21 Jan - Sun, 25 Jan

Austrian Airlines flights from Portland, Maine to London Heathrow Airport

Our best Austrian Airlines deals on Portland, Maine to London Heathrow Airport flight tickets
Austrian Airlines
16 Jan
PWM08:40Portland
20h 45m
1 stop
LHR10:25London Heathrow
23 Jan
LHR06:00London Heathrow
17h 50m
2 stops
PWM18:50Portland
£467
Find similar
Austrian Airlines
16 Jan
PWM08:40Portland
20h 45m
1 stop
LHR10:25London Heathrow
23 Jan
LHR08:00London Heathrow
15h 50m
1 stop
PWM18:50Portland
£477
Find similar
Austrian Airlines
13 Jan
PWM11:12Portland
16h 13m
1 stop
LHR08:25London Heathrow
19 Jan
LHR19:25London Heathrow
33h 02m
2 stops
PWM23:27Portland
£583
Find similar

United Airlines flights from Portland, Maine to London Heathrow Airport

Our best United Airlines deals on Portland, Maine to London Heathrow Airport flight tickets
United Airlines
15 Jan
PWM19:27Portland
10h 38m
1 stop
LHR11:05London Heathrow
22 Jan
LHR06:50London Heathrow
17h 02m
2 stops
PWM18:52Portland
£470
Find similar
United Airlines
16 Jan
PWM15:12Portland
14h 38m
2 stops
LHR10:50London Heathrow
23 Jan
LHR06:50London Heathrow
17h 00m
2 stops
PWM18:50Portland
£473
Find similar
United Airlines
21 Jan
PWM19:27Portland
10h 38m
1 stop
LHR11:05London Heathrow
25 Jan
LHR13:25London Heathrow
34h 25m
2 stops
PWM18:50Portland
£476
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 21 December 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

Fri 16/1

08:40-10:25

1 stop20h 45m

London Heathrow

Fri 23/1

06:00-18:50

2 stops17h 50m

£467

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 3/2

05:30-09:00

1 stop22h 30m

London Heathrow

Tue 10/2

06:30-22:27

2 stops20h 57m

£470

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 16/1

15:12-10:50

2 stops14h 38m

London Heathrow

Fri 23/1

06:50-18:50

2 stops17h 00m

£473

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 3/2

14:35-10:30

2 stops14h 55m

London Heathrow

Tue 10/2

08:40-00:20

2 stops20h 40m

£474

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 16/1

08:40-10:25

1 stop20h 45m

London Heathrow

Fri 23/1

08:00-18:50

1 stop15h 50m

£477

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 21/1

06:00-07:10

2 stops20h 10m

London Heathrow

Sun 25/1

13:25-23:30

2 stops39h 05m

£479

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 31/3

12:50-08:55

1 stop15h 05m

London Heathrow

Tue 14/4

06:30-22:03

2 stops20h 33m

£482

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 31/3

16:50-13:30

2 stops15h 40m

London Heathrow

Tue 14/4

06:30-22:03

2 stops20h 33m

£485

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 11/2

12:10-08:45

1 stop15h 35m

London Heathrow

Mon 16/2

10:45-23:06

1 stop17h 21m

£491

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 21/1

11:12-06:40

2 stops14h 28m

London Heathrow

Sun 25/1

15:10-23:30

1 stop13h 20m

£494

Flights are sorted by cheapest return flights first.

Showing 1-10 of 13 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 cheapest month to fly to London Heathrow Airport?

In general, October 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 £562. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Portland, Maine averaging around £581.

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 £479. 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 £592.

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 £508. 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 morning when prices are £546 on average. Flights to London Heathrow Airport from Portland, Maine in the morning 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

Fastest flight time

9h 45m

Direct flights

None
The fastest flight from Portland, Maine to London Heathrow Airport takes 9h 45m
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.
Search flight deals

  • 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 45m.

  • 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
Gatwick
Maidstone
Slough
Northampton
Swindon
Stratford-upon-Avon
Southend-on-Sea
Canterbury
Ipswich
Ilford
Poole
Guildford
Swanage
Hayes
Chelmsford
Dover
Worthing

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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