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Cheap flights from London Heathrow Airport to Boston from £539

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Boston departing on 12/1. 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.
Multiple Airlines Logo
10:15 - 22:54
LHR
-
PWM
17h 39m1 stop
Multiple Airlines Logo
12:40 - 07:50
PWM
-
LHR
14h 10m1 stop
£539Multiple Airlines
Mon, 12 Jan - Mon, 19 Jan
American Airlines Logo
13:30 - 22:54
LHR
-
PWM
14h 24m2 stops
American Airlines Logo
12:46 - 07:50
PWM
-
LHR
14h 04m2 stops
£559American Airlines
Mon, 12 Jan - Mon, 19 Jan
United Airlines Logo
12:05 - 23:30
LHR
-
PWM
16h 25m2 stops
United Airlines Logo
16:10 - 11:15
PWM
-
LHR
14h 05m1 stop
£591United Airlines
Thu, 22 Jan - Mon, 26 Jan
United Airlines Logo
11:10 - 23:30
LHR
-
PWM
17h 20m2 stops
United Airlines Logo
15:12 - 08:25
PWM
-
LHR
12h 13m1 stop
£595United Airlines
Thu, 29 Jan - Thu, 5 Feb
United Airlines Logo
12:05 - 18:52
LHR
-
PWM
11h 47m1 stop
United Airlines Logo
06:00 - 21:20
PWM
-
LHR
10h 20m1 stop
£618United Airlines
Thu, 22 Jan - Mon, 26 Jan
Austrian Airlines Logo
12:00 - 18:50
LHR
-
PWM
11h 50m1 stop
Austrian Airlines Logo
08:40 - 08:25
PWM
-
LHR
18h 45m1 stop
£625Austrian Airlines
Thu, 29 Jan - Thu, 5 Feb
Scandinavian Airlines Logo
06:40 - 00:20
LHR
-
PWM
22h 40m2 stops
Scandinavian Airlines Logo
14:35 - 14:35
PWM
-
LHR
19h 00m3 stops
£635Scandinavian Airlines
Thu, 29 Jan - Thu, 5 Feb
Scandinavian Airlines Logo
06:40 - 00:20
LHR
-
PWM
22h 40m3 stops
Scandinavian Airlines Logo
14:35 - 16:25
PWM
-
LHR
20h 50m3 stops
£640Scandinavian Airlines
Thu, 29 Jan - Thu, 5 Feb
Multiple Airlines Logo
18:00 - 13:56
LHR
-
PWM
24h 56m3 stops
Multiple Airlines Logo
09:40 - 07:10
PWM
-
LHR
16h 30m2 stops
£993Multiple Airlines
Mon, 12 Jan - Mon, 19 Jan
Multiple Airlines Logo
19:20 - 22:27
LHR
-
PWM
32h 07m2 stops
Multiple Airlines Logo
05:30 - 20:10
PWM
-
LHR
57h 40m2 stops
£999Multiple Airlines
Mon, 5 Jan - Sat, 10 Jan

United Airlines flights from London Heathrow Airport to Portland, Maine

Our best United Airlines deals on London Heathrow Airport to Portland, Maine flight tickets
United Airlines
22 Jan
LHR12:05London Heathrow
16h 25m
2 stops
PWM23:30Portland
26 Jan
PWM16:10Portland
14h 05m
1 stop
LHR11:15London Heathrow
£591
Find similar
United Airlines
29 Jan
LHR11:10London Heathrow
17h 20m
2 stops
PWM23:30Portland
5 Feb
PWM15:12Portland
12h 13m
1 stop
LHR08:25London Heathrow
£595
Find similar
United Airlines
22 Jan
LHR12:05London Heathrow
11h 47m
1 stop
PWM18:52Portland
26 Jan
PWM06:00Portland
10h 20m
1 stop
LHR21:20London Heathrow
£618
Find similar

Delta flights from London Heathrow Airport to Portland, Maine

Our best Delta deals on London Heathrow Airport to Portland, Maine flight tickets
Delta
5 Jan
LHR10:00London Heathrow
19h 20m
2 stops
PWM00:20Portland
10 Jan
PWM14:35Portland
24h 35m
1 stop
LHR20:10London Heathrow
£1,214
Find similar
Delta
5 Jan
LHR10:45London Heathrow
17h 09m
1 stop
PWM22:54Portland
10 Jan
PWM14:35Portland
24h 35m
1 stop
LHR20:10London Heathrow
£1,281
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport to Portland, Maine 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 17 December 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Portland, Maine that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 12/1

10:15-22:54

1 stop17h 39m

Portland

Mon 19/1

12:40-07:50

1 stop14h 10m

£539

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 12/1

13:30-22:54

2 stops14h 24m

Portland

Mon 19/1

12:46-07:50

2 stops14h 04m

£559

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 22/1

12:05-23:30

2 stops16h 25m

Portland

Mon 26/1

16:10-11:15

1 stop14h 05m

£591

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 29/1

11:10-23:30

2 stops17h 20m

Portland

Thu 5/2

15:12-08:25

1 stop12h 13m

£595

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 22/1

12:05-18:52

1 stop11h 47m

Portland

Mon 26/1

06:00-21:20

1 stop10h 20m

£618

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 29/1

12:00-18:50

1 stop11h 50m

Portland

Thu 5/2

08:40-08:25

1 stop18h 45m

£625

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 29/1

06:40-00:20

2 stops22h 40m

Portland

Thu 5/2

14:35-14:35

3 stops19h 00m

£635

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 29/1

06:40-00:20

3 stops22h 40m

Portland

Thu 5/2

14:35-16:25

3 stops20h 50m

£640

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 12/1

18:00-13:56

3 stops24h 56m

Portland

Mon 19/1

09:40-07:10

2 stops16h 30m

£993

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 5/1

19:20-22:27

2 stops32h 07m

Portland

Sat 10/1

05:30-20:10

2 stops57h 40m

£999

Flights are sorted by cheapest return flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
1
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See travel insights to Boston from

How to get the cheapest flight ticket from London Heathrow Airport to Portland, Maine

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 Portland, Maine?

The cheapest month to fly to Portland, Maine from London Heathrow Airport is in February. Flight prices, which tend to average around £501, are often lower during this time because this is during the off-season. The month of November is another great option to travel to Portland, Maine, with average flight prices from London Heathrow Airport averaging around £551.

What is the cheapest day to depart on your flight to Portland, Maine?

According to our data, Monday is the cheapest day to fly to Portland, Maine from London Heathrow Airport. The lowest ticket price found for a Monday departure recently was £638. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to Portland, Maine on Friday is £779.

What is the cheapest time of day to depart on your flight to Portland, Maine?

Our data shows that the cheapest London Heathrow Airport to Portland, Maine flights are usually those with departure times in the evening. Our users have found flights to Portland, Maine in the evening for as low as £598. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £786 on average. Flights to Portland, Maine from London Heathrow Airport in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

When to book flights from London Heathrow Airport to Portland, Maine

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Portland, Maine according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London Heathrow Airport to Portland, Maine (LHR to PWM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Portland, Maine

Fastest flight time

16h 25m

Direct flights

None
The fastest flight from London Heathrow Airport to Portland, Maine takes 16h 25m
There are no direct flights from London Heathrow Airport to Portland, Maine. There are no popular flight routes from London Heathrow Airport to Portland, Maine.
Search flight deals

  • How far is London Heathrow to Portland by plane?

    A flight from London Heathrow to Portland will travel around 3170.3 mi. Flights usually cover this in 16h 25m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from London Heathrow Airport to Portland Airport?

    Prices for flights from London Heathrow Airport to Portland Airport are updated daily.

  • How many operators does momondo search for flights from London Heathrow Airport to Portland Airport?

  • How old do you have to be to fly from London Heathrow Airport to Portland 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 London Heathrow Airport to Portland Airport.

  • What documentation or ID do you need to fly to Portland Airport?

    The travel and health documents required for your trip to Portland Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Portland Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from London Heathrow Airport to Portland, Maine?

Best airlines flying from London Heathrow Airport to Portland, Maine

Compare and see reviews for airlines that fly from London Heathrow Airport to Portland, Maine with momondo
Airline
Rating
Free Cancellation
Price
JetBluePriceFrom £399Free CancellationRating
7.2
2,895 reviews
Search JetBlue flights
Virgin AtlanticPriceFrom £470Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
FinnairPriceFrom £473Free CancellationRating
7.6
1,337 reviews
Search Finnair flights
IcelandairPriceFrom £490Free CancellationRating
7.0
591 reviews
Search Icelandair flights
KLMPriceFrom £501Free CancellationRating
7.7
1,430 reviews
Search KLM flights
LufthansaPriceFrom £513Free CancellationRating
6.8
7,632 reviews
Search Lufthansa flights
United AirlinesPriceFrom £557Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights

Travelling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Bath

Why use momondo?

Why should I use momondo to find a flight deal from London to Portland?

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 Portland from London.

Can I find flights from London to Portland with flexible booking policies on momondo?

All flight searches from London to Portland on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from London to Portland?

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 London to Portland.

I’m not ready to book a flight from London to Portland right now. Can momondo alert me if prices change?

Price alerts on flights to Portland from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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