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Cheap flights from Portland, Maine to London from £208

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 13/8. 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

Enter your travel dates to find the best prices.
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
08:15 - 23:36
LHR
-
PWM
20h 21m
1 stop
£501JetBlue
Wed, 6 May - Mon, 11 May
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
08:15 - 23:36
LHR
-
PWM
20h 21m
1 stop
£504JetBlue
Wed, 6 May - Mon, 11 May
Scandinavian Airlines Logo
06:30 - 09:35
PWM
-
LHR
22h 05m
2 stops
Scandinavian Airlines Logo
07:05 - 00:43
LHR
-
PWM
22h 38m
2 stops
£514Scandinavian Airlines
Wed, 6 May - Mon, 11 May
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
11:55 - 23:36
LHR
-
PWM
16h 41m
1 stop
£515JetBlue
Sun, 3 May - Wed, 6 May
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
11:55 - 23:36
LHR
-
PWM
16h 41m
1 stop
£518JetBlue
Wed, 6 May - Mon, 11 May
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
08:15 - 23:36
LHR
-
PWM
20h 21m
1 stop
£523JetBlue
Sun, 3 May - Sun, 17 May
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
11:55 - 23:36
LHR
-
PWM
16h 41m
1 stop
£530JetBlue
Fri, 1 May - Mon, 4 May
Scandinavian Airlines Logo
06:30 - 09:35
PWM
-
LHR
22h 05m
2 stops
Scandinavian Airlines Logo
07:05 - 00:43
LHR
-
PWM
22h 38m
3 stops
£533Scandinavian Airlines
Wed, 6 May - Mon, 11 May
JetBlue Logo
07:28 - 20:45
PWM
-
LHR
32h 17m
1 stop
JetBlue Logo
08:15 - 23:36
LHR
-
PWM
20h 21m
1 stop
£534JetBlue
Thu, 30 Apr - Sun, 3 May
Scandinavian Airlines Logo
06:30 - 09:35
PWM
-
LHR
22h 05m
2 stops
Scandinavian Airlines Logo
07:05 - 00:43
LHR
-
PWM
22h 38m
2 stops
£536Scandinavian Airlines
Wed, 6 May - Mon, 11 May

JetBlue flights from Portland, Maine to London Heathrow Airport

Our best JetBlue deals on Portland, Maine to London Heathrow Airport flight tickets
JetBlue
6 May
PWM06:00Portland
9h 45m
1 stop
LHR20:45London Heathrow
11 May
LHR08:15London Heathrow
20h 21m
1 stop
PWM23:36Portland
£501
JetBlue
6 May
PWM06:00Portland
9h 45m
1 stop
LHR20:45London Heathrow
11 May
LHR08:15London Heathrow
20h 21m
1 stop
PWM23:36Portland
£504
JetBlue
3 May
PWM06:00Portland
9h 45m
1 stop
LHR20:45London Heathrow
6 May
LHR11:55London Heathrow
16h 41m
1 stop
PWM23:36Portland
£515

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
1 Apr
PWM16:28Portland
14h 17m
1 stop
LHR11:45London Heathrow
16 Apr
LHR06:55London Heathrow
19h 45m
2 stops
PWM21:40Portland
£538
United Airlines
1 Apr
PWM06:00Portland
19h 55m
2 stops
LHR06:55London Heathrow
16 Apr
LHR06:55London Heathrow
19h 45m
2 stops
PWM21:40Portland
£541
United Airlines
6 May
PWM06:00Portland
10h 35m
1 stop
LHR21:35London Heathrow
11 May
LHR06:50London Heathrow
16h 33m
2 stops
PWM18:23Portland
£574

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 March 2026.
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

Wed 6/5

06:00-20:45

1 stop9h 45m

London Heathrow

Mon 11/5

08:15-23:36

1 stop20h 21m

£501

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

06:00-20:45

1 stop9h 45m

London Heathrow

Mon 11/5

08:15-23:36

1 stop20h 21m

£504

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

06:30-09:35

2 stops22h 05m

London Heathrow

Mon 11/5

07:05-00:43

2 stops22h 38m

£514

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 3/5

06:00-20:45

1 stop9h 45m

London Heathrow

Wed 6/5

11:55-23:36

1 stop16h 41m

£515

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

06:00-20:45

1 stop9h 45m

London Heathrow

Mon 11/5

11:55-23:36

1 stop16h 41m

£518

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 3/5

06:00-20:45

1 stop9h 45m

London Heathrow

Sun 17/5

08:15-23:36

1 stop20h 21m

£523

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 1/5

06:00-20:45

1 stop9h 45m

London Heathrow

Mon 4/5

11:55-23:36

1 stop16h 41m

£530

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

06:30-09:35

2 stops22h 05m

London Heathrow

Mon 11/5

07:05-00:43

3 stops22h 38m

£533

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 30/4

07:28-20:45

1 stop32h 17m

London Heathrow

Sun 3/5

08:15-23:36

1 stop20h 21m

£534

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

06:30-09:35

2 stops22h 05m

London Heathrow

Mon 11/5

07:05-00:43

2 stops22h 38m

£536

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 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 £561. The month of January is another great option to travel to London Heathrow Airport, with average flight prices from Portland, Maine averaging around £583.

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 Tuesday. momondo users have found tickets for Tuesday departures for as low as £428. 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 £548.

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 afternoon. momondo users have found flights departing from Portland, Maine to London Heathrow Airport in the afternoon for as low as £438. 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 £538 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
Stratford-upon-Avon
Swindon
Southend-on-Sea
Canterbury
Ipswich
Ilford
Wembley
Poole
Guildford
Chelmsford
Hayes
Dover
Folkestone

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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