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Cheap flights from London Heathrow Airport to Boston from $722

This is the cheapest round-trip 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 1/12. 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 round-trip flights

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Multiple Airlines Logo
10:15 am - 10:54 pm
LHR
-
PWM
17h 39m1 stop
Multiple Airlines Logo
12:40 pm - 7:50 am
PWM
-
LHR
14h 10m1 stop
$722Multiple Airlines
Mon, Jan 12 - Mon, Jan 19
American Airlines Logo
12:55 pm - 11:43 pm
LHR
-
PWM
15h 48m2 stops
American Airlines Logo
3:58 pm - 7:50 am
PWM
-
LHR
10h 52m1 stop
$749American Airlines
Mon, Jan 12 - Mon, Jan 19
United Airlines Logo
12:05 pm - 11:30 pm
LHR
-
PWM
16h 25m2 stops
United Airlines Logo
3:12 pm - 8:25 am
PWM
-
LHR
12h 13m1 stop
$792United Airlines
Thu, Jan 22 - Mon, Jan 26
United Airlines Logo
11:10 am - 11:30 pm
LHR
-
PWM
17h 20m2 stops
United Airlines Logo
3:12 pm - 8:25 am
PWM
-
LHR
12h 13m1 stop
$797United Airlines
Thu, Jan 29 - Thu, Feb 5
United Airlines Logo
12:05 pm - 6:52 pm
LHR
-
PWM
11h 47m1 stop
United Airlines Logo
6:00 am - 9:20 pm
PWM
-
LHR
10h 20m1 stop
$829United Airlines
Thu, Jan 22 - Mon, Jan 26
Austrian Airlines Logo
12:00 pm - 6:50 pm
LHR
-
PWM
11h 50m1 stop
Austrian Airlines Logo
8:40 am - 8:25 am
PWM
-
LHR
18h 45m1 stop
$838Austrian Airlines
Thu, Jan 29 - Thu, Feb 5
Scandinavian Airlines Logo
6:40 am - 12:20 am
LHR
-
PWM
22h 40m2 stops
Scandinavian Airlines Logo
2:35 pm - 2:35 pm
PWM
-
LHR
19h 00m3 stops
$851Scandinavian Airlines
Thu, Jan 29 - Thu, Feb 5
Scandinavian Airlines Logo
6:40 am - 12:20 am
LHR
-
PWM
22h 40m3 stops
Scandinavian Airlines Logo
2:35 pm - 4:25 pm
PWM
-
LHR
20h 50m3 stops
$858Scandinavian Airlines
Thu, Jan 29 - Thu, Feb 5
Multiple Airlines Logo
6:00 pm - 1:56 pm
LHR
-
PWM
24h 56m3 stops
Multiple Airlines Logo
9:40 am - 7:10 am
PWM
-
LHR
16h 30m2 stops
$1,331Multiple Airlines
Mon, Jan 12 - Mon, Jan 19
Multiple Airlines Logo
7:20 pm - 10:27 pm
LHR
-
PWM
32h 07m2 stops
Multiple Airlines Logo
5:30 am - 8:10 pm
PWM
-
LHR
57h 40m2 stops
$1,339Multiple Airlines
Mon, Jan 5 - Sat, Jan 10

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
Jan 22
LHR12:05 pmLondon Heathrow
16h 25m
2 stops
PWM11:30 pmPortland
Jan 26
PWM2:31 pmPortland
12h 54m
2 stops
LHR8:25 amLondon Heathrow
$792
Find similar
United Airlines
Jan 29
LHR11:10 amLondon Heathrow
17h 20m
2 stops
PWM11:30 pmPortland
Feb 5
PWM3:12 pmPortland
12h 13m
1 stop
LHR8:25 amLondon Heathrow
$797
Find similar
United Airlines
Jan 22
LHR4:00 pmLondon Heathrow
12h 30m
1 stop
PWM11:30 pmPortland
Jan 26
PWM3:12 pmPortland
12h 13m
1 stop
LHR8:25 amLondon Heathrow
$829
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
Jan 5
LHR10:00 amLondon Heathrow
19h 20m
2 stops
PWM12:20 amPortland
Jan 10
PWM2:35 pmPortland
24h 35m
1 stop
LHR8:10 pmLondon Heathrow
$1,627
Find similar
Delta
Jan 5
LHR10:45 amLondon Heathrow
17h 09m
1 stop
PWM10:54 pmPortland
Jan 10
PWM2:35 pmPortland
24h 35m
1 stop
LHR8:10 pmLondon Heathrow
$1,717
Find similar

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated December 16, 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 1/12

10:15 am-10:54 pm

1 stop17h 39m

Portland

Mon 1/19

12:40 pm-7:50 am

1 stop14h 10m

$722

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 1/12

12:55 pm-11:43 pm

2 stops15h 48m

Portland

Mon 1/19

3:58 pm-7:50 am

1 stop10h 52m

$749

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 1/22

12:05 pm-11:30 pm

2 stops16h 25m

Portland

Mon 1/26

3:12 pm-8:25 am

1 stop12h 13m

$792

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 1/29

11:10 am-11:30 pm

2 stops17h 20m

Portland

Thu 2/5

3:12 pm-8:25 am

1 stop12h 13m

$797

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 1/22

12:05 pm-6:52 pm

1 stop11h 47m

Portland

Mon 1/26

6:00 am-9:20 pm

1 stop10h 20m

$829

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 1/29

12:00 pm-6:50 pm

1 stop11h 50m

Portland

Thu 2/5

8:40 am-8:25 am

1 stop18h 45m

$838

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 1/29

6:40 am-12:20 am

2 stops22h 40m

Portland

Thu 2/5

2:35 pm-2:35 pm

3 stops19h 00m

$851

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 1/29

6:40 am-12:20 am

3 stops22h 40m

Portland

Thu 2/5

2:35 pm-4:25 pm

3 stops20h 50m

$858

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 1/12

6:00 pm-1:56 pm

3 stops24h 56m

Portland

Mon 1/19

9:40 am-7:10 am

2 stops16h 30m

$1,331

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 1/5

7:20 pm-10:27 pm

2 stops32h 07m

Portland

Sat 1/10

5:30 am-8:10 pm

2 stops57h 40m

$1,339

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 $672, are often lower during this time because this is during the off-season. If you aren’t able to travel to Portland, Maine during the month of February, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $739.

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

In the morning is the cheapest time of day to fly from London Heathrow Airport to Portland, Maine when you can find flight prices for as low as $1,150. Flying to Portland, Maine in the morning is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the afternoon because they tend to be around $1,296. Of course, these prices can vary depending on the time of year and what airport you fly to.

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 round-trip 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. A reasonable flight in good conditions will take 16h 25m.

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Portland Airport.

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

    The required travel and health documents for your Portland Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Portland Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
North Conway
Boothbay Harbor
Jackson
Conway
Freeport
Lewiston
Bartlett
Brunswick
Auburn
Gorham
Windham
Intervale
Oxford
Bath
Georgetown
Falmouth
Tamworth

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Portland for you.

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

Yes. momondo allows you to filter the results for London to Portland flights to just show those with 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?

Of course. momondo tracks the price of London to Portland flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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