Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Portland, Maine to London from £245

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 5/8. 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
1 adult, Economy, 0 bags

Find the cheapest flights from Portland, Maine to London

Cheap return flights

Enter your travel dates to find the best prices.
United Airlines Logo
08:45 - 08:25
PWM
-
LHR
18h 40m
1 stop
United Airlines Logo
06:50 - 23:21
LHR
-
PWM
21h 31m
2 stops
£551United Airlines
Mon, 9 Nov - Wed, 11 Nov
United Airlines Logo
15:10 - 10:05
PWM
-
LHR
13h 55m
2 stops
United Airlines Logo
07:40 - 18:52
LHR
-
PWM
16h 12m
2 stops
£571United Airlines
Mon, 9 Nov - Wed, 11 Nov
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
08:15 - 00:10
LHR
-
PWM
20h 55m
1 stop
£590JetBlue
Sun, 6 Sep - Tue, 8 Sep
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
08:15 - 00:10
LHR
-
PWM
20h 55m
1 stop
£591JetBlue
Sun, 6 Sep - Tue, 8 Sep
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
08:15 - 00:25
LHR
-
PWM
21h 10m
1 stop
£615JetBlue
Sun, 23 Aug - Sat, 29 Aug
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
08:15 - 12:30
LHR
-
PWM
33h 15m
1 stop
£620JetBlue
Mon, 24 Aug - Mon, 31 Aug
Multiple Airlines Logo
16:20 - 08:50
PWM
-
LHR
11h 30m
1 stop
Multiple Airlines Logo
11:55 - 23:54
LHR
-
PWM
16h 59m
1 stop
£621Multiple Airlines
Fri, 11 Sep - Fri, 18 Sep
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
08:15 - 23:54
LHR
-
PWM
20h 39m
1 stop
£625JetBlue
Fri, 25 Sep - Mon, 28 Sep
JetBlue Logo
06:40 - 20:45
PWM
-
LHR
9h 05m
1 stop
JetBlue Logo
08:15 - 23:54
LHR
-
PWM
20h 39m
1 stop
£627JetBlue
Sat, 5 Sep - Sat, 12 Sep
Delta Logo
14:15 - 09:00
PWM
-
LHR
13h 45m
1 stop
Delta Logo
06:30 - 23:33
LHR
-
PWM
22h 03m
2 stops
£644Delta
Tue, 10 Nov - Tue, 24 Nov

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

JetBlue flights from Portland, Maine to London Heathrow Airport

Our best JetBlue deals on Portland, Maine to London Heathrow Airport flight tickets
JetBlue
6 Sept
PWM06:00Portland
9h 45m
1 stop
LHR20:45London Heathrow
8 Sept
LHR08:15London Heathrow
20h 55m
1 stop
PWM00:10Portland
£590
JetBlue
6 Sept
PWM06:00Portland
9h 45m
1 stop
LHR20:45London Heathrow
8 Sept
LHR08:15London Heathrow
20h 55m
1 stop
PWM00:10Portland
£591
JetBlue
23 Aug
PWM06:00Portland
9h 45m
1 stop
LHR20:45London Heathrow
29 Aug
LHR08:15London Heathrow
21h 10m
1 stop
PWM00:25Portland
£615

Delta flights from Portland, Maine to London Heathrow Airport

Our best Delta deals on Portland, Maine to London Heathrow Airport flight tickets
Delta
10 Nov
PWM16:03Portland
13h 27m
1 stop
LHR10:30London Heathrow
17 Nov
LHR10:00London Heathrow
18h 55m
2 stops
PWM23:55Portland
£645
Delta
10 Nov
PWM12:50Portland
17h 50m
2 stops
LHR11:40London Heathrow
17 Nov
LHR08:40London Heathrow
19h 53m
2 stops
PWM23:33Portland
£648
Delta
14 Aug
PWM16:47Portland
15h 28m
2 stops
LHR13:15London Heathrow
27 Aug
LHR08:40London Heathrow
21h 19m
2 stops
PWM00:59Portland
£693

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 31 July 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

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 9/11

08:45-08:25

1 stop18h 40m

London Heathrow

Wed 11/11

06:50-23:21

2 stops21h 31m

£551

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 9/11

15:10-10:05

2 stops13h 55m

London Heathrow

Wed 11/11

07:40-18:52

2 stops16h 12m

£571

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 6/9

06:00-20:45

1 stop9h 45m

London Heathrow

Tue 8/9

08:15-00:10

1 stop20h 55m

£590

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 6/9

06:00-20:45

1 stop9h 45m

London Heathrow

Tue 8/9

08:15-00:10

1 stop20h 55m

£591

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 23/8

06:00-20:45

1 stop9h 45m

London Heathrow

Sat 29/8

08:15-00:25

1 stop21h 10m

£615

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 24/8

06:00-20:45

1 stop9h 45m

London Heathrow

Mon 31/8

08:15-12:30

1 stop33h 15m

£620
Fastest return journey

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 11/9

16:20-08:50

1 stop11h 30m

London Heathrow

Fri 18/9

11:55-23:54

1 stop16h 59m

£621

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 25/9

06:00-20:45

1 stop9h 45m

London Heathrow

Mon 28/9

08:15-23:54

1 stop20h 39m

£625

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 5/9

06:40-20:45

1 stop9h 05m

London Heathrow

Sat 12/9

08:15-23:54

1 stop20h 39m

£627

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/11

14:15-09:00

1 stop13h 45m

London Heathrow

Tue 24/11

06:30-23:33

2 stops22h 03m

£644

Flights are sorted by cheapest return flights first.

Showing 1-10 of 18 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 month to fly to London Heathrow Airport?

In general, December 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 £0. The month of January is another great option to travel to London Heathrow Airport, with average flight prices from Portland, Maine averaging around £0.

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

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 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
Wembley
Gatwick
Milton Keynes
Luton
Stratford-upon-Avon
Southend-on-Sea
Slough
Northampton
Ipswich
Maidstone
Swindon
Folkestone
Ilford
Hastings
Poole
Canterbury
Guildford
Chichester
Bedford

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.

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 30/8
Sun 6/9
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to London