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Cheap flights from Portland, Maine to London from £189

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 7/5. 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.
Delta Logo
14:51 - 06:20
PWM
-
LHR
10h 29m
1 stop
Delta Logo
09:55 - 23:09
LHR
-
PWM
18h 14m
2 stops
£539Delta
Wed, 6 May - Mon, 11 May
KLM Logo
14:51 - 08:50
PWM
-
LHR
12h 59m
1 stop
KLM Logo
11:45 - 00:43
LHR
-
PWM
17h 58m
2 stops
£540KLM
Mon, 4 May - Mon, 18 May
Delta Logo
12:46 - 08:50
PWM
-
LHR
15h 04m
2 stops
Delta Logo
09:55 - 00:43
LHR
-
PWM
19h 48m
2 stops
£543Delta
Wed, 6 May - Mon, 11 May
KLM Logo
14:51 - 10:20
PWM
-
LHR
14h 29m
1 stop
KLM Logo
09:20 - 23:09
LHR
-
PWM
18h 49m
1 stop
£544KLM
Wed, 6 May - Mon, 11 May
KLM Logo
12:46 - 07:10
PWM
-
LHR
13h 24m
1 stop
KLM Logo
12:50 - 00:43
LHR
-
PWM
16h 53m
1 stop
£545KLM
Wed, 6 May - Mon, 11 May
Delta Logo
14:51 - 07:15
PWM
-
LHR
11h 24m
1 stop
Delta Logo
08:40 - 23:09
LHR
-
PWM
19h 29m
2 stops
£550Delta
Wed, 6 May - Mon, 11 May
Delta Logo
14:38 - 14:35
PWM
-
LHR
18h 57m
1 stop
Delta Logo
06:30 - 23:12
LHR
-
PWM
21h 42m
2 stops
£551Delta
Fri, 8 May - Wed, 13 May
Delta Logo
14:38 - 06:20
PWM
-
LHR
10h 42m
1 stop
Delta Logo
11:30 - 00:43
LHR
-
PWM
18h 13m
2 stops
£552Delta
Thu, 7 May - Sun, 10 May
Delta Logo
14:38 - 10:20
PWM
-
LHR
14h 42m
1 stop
Delta Logo
06:30 - 00:43
LHR
-
PWM
23h 13m
2 stops
£552Delta
Sun, 10 May - Sat, 16 May
Delta Logo
12:46 - 10:20
PWM
-
LHR
16h 34m
2 stops
Delta Logo
09:55 - 00:43
LHR
-
PWM
19h 48m
2 stops
£554Delta
Wed, 6 May - Mon, 11 May

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Virgin Atlantic flights from Portland, Maine to London Heathrow Airport

Our best Virgin Atlantic deals on Portland, Maine to London Heathrow Airport flight tickets
Virgin Atlantic
14 Oct
PWM06:00Portland
19h 25m
1 stop
LHR06:25London Heathrow
22 Oct
LHR11:15London Heathrow
16h 08m
1 stop
PWM22:23Portland
£544
Virgin Atlantic
6 May
PWM05:21Portland
20h 04m
1 stop
LHR06:25London Heathrow
1 Jun
LHR06:15London Heathrow
21h 54m
2 stops
PWM23:09Portland
£569
Virgin Atlantic
6 May
PWM05:21Portland
20h 54m
1 stop
LHR07:15London Heathrow
1 Jun
LHR11:15London Heathrow
16h 54m
1 stop
PWM23:09Portland
£574

Delta flights from Portland, Maine to London Heathrow Airport

Our best Delta deals on Portland, Maine to London Heathrow Airport flight tickets
Delta
6 May
PWM14:51Portland
10h 29m
1 stop
LHR06:20London Heathrow
11 May
LHR09:55London Heathrow
18h 14m
2 stops
PWM23:09Portland
£539
Delta
26 Apr
PWM14:51Portland
14h 29m
1 stop
LHR10:20London Heathrow
3 May
LHR11:45London Heathrow
18h 01m
2 stops
PWM00:46Portland
£540
Delta
6 May
PWM12:46Portland
15h 04m
2 stops
LHR08:50London Heathrow
11 May
LHR09:55London Heathrow
19h 48m
2 stops
PWM00:43Portland
£543

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 19 April 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

Cheapest return flight
Fastest return journey

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

14:51-06:20

1 stop10h 29m

London Heathrow

Mon 11/5

09:55-23:09

2 stops18h 14m

£539

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 4/5

14:51-08:50

1 stop12h 59m

London Heathrow

Mon 18/5

11:45-00:43

2 stops17h 58m

£540

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

12:46-08:50

2 stops15h 04m

London Heathrow

Mon 11/5

09:55-00:43

2 stops19h 48m

£543

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

14:51-10:20

1 stop14h 29m

London Heathrow

Mon 11/5

09:20-23:09

1 stop18h 49m

£544

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

12:46-07:10

1 stop13h 24m

London Heathrow

Mon 11/5

12:50-00:43

1 stop16h 53m

£545

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

14:51-07:15

1 stop11h 24m

London Heathrow

Mon 11/5

08:40-23:09

2 stops19h 29m

£550

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 8/5

14:38-14:35

1 stop18h 57m

London Heathrow

Wed 13/5

06:30-23:12

2 stops21h 42m

£551

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 7/5

14:38-06:20

1 stop10h 42m

London Heathrow

Sun 10/5

11:30-00:43

2 stops18h 13m

£552

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 10/5

14:38-10:20

1 stop14h 42m

London Heathrow

Sat 16/5

06:30-00:43

2 stops23h 13m

£552

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 6/5

12:46-10:20

2 stops16h 34m

London Heathrow

Mon 11/5

09:55-00:43

2 stops19h 48m

£554

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 airline that flies from Portland to London Heathrow?

KLM, Delta, and American Airlines are the most popular carriers operating from Portland to London Heathrow

Which airlines fly to London Heathrow Airport?

British Airways, Virgin Atlantic and Iberia are the top three most popular airlines that fly to London Heathrow Airport from Portland, Maine according to our data. British Airways is the first choice among our users, with 42% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 9 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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

10h 21m

Direct flights

None
The fastest flight from Portland, Maine to London Heathrow Airport takes 10h 21m
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

Frequently asked questions about flying from Portland, Maine to London Heathrow Airport

  • 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 21m.

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