Cheap flights from London to Portland from $552

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 to Portland departing on 9/15. 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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Cheap round-trip flights

JetBlue Logo
8:15 am - 10:07 pmLHR-PWM
18h 52m1 stop
JetBlue Logo
2:17 pm - 8:45 pmPWM-LHR
25h 28m1 stop
$552JetBlue
Find Deal
Mon, Sep 15 - Mon, Sep 29
Icelandair Logo
8:15 am - 10:07 pmLHR-PWM
18h 52m1 stop
Icelandair Logo
7:09 am - 6:30 amPWM-LHR
18h 21m2 stops
$608Icelandair
Find Deal
Mon, Sep 15 - Mon, Sep 29
JetBlue Logo
8:15 am - 10:02 pmLHR-PWM
18h 47m1 stop
JetBlue Logo
2:17 pm - 8:45 pmPWM-LHR
25h 28m1 stop
$610JetBlue
Find Deal
Thu, Sep 4 - Tue, Sep 9
Virgin Atlantic Logo
12:45 pm - 12:11 amLHR-PWM
16h 26m2 stops
Virgin Atlantic Logo
6:00 am - 6:20 amPWM-LHR
19h 20m2 stops
$672Virgin Atlantic
Find Deal
Mon, Sep 15 - Mon, Sep 29
United Airlines Logo
8:00 am - 6:38 pmLHR-PWM
15h 38m1 stop
United Airlines Logo
6:00 am - 5:55 amPWM-LHR
19h 55m2 stops
$721United Airlines
Find Deal
Sat, Oct 25 - Fri, Oct 31
American Airlines Logo
2:40 pm - 11:45 pmLHR-PWM
14h 05m2 stops
American Airlines Logo
2:30 pm - 8:05 amPWM-LHR
12h 35m1 stop
$755American Airlines
Find Deal
Thu, Sep 4 - Tue, Sep 9
Finnair Logo
8:55 am - 5:55 pmLHR-PWM
14h 00m2 stops
Finnair Logo
1:09 pm - 7:50 amPWM-LHR
13h 41m2 stops
$769Finnair
Find Deal
Sat, Sep 13 - Sat, Sep 20
United Airlines Logo
7:30 am - 7:29 pmLHR-PWM
16h 59m2 stops
United Airlines Logo
3:11 pm - 10:40 amPWM-LHR
14h 29m2 stops
$782United Airlines
Find Deal
Thu, Sep 4 - Tue, Sep 9
American Airlines Logo
10:05 am - 8:36 pmLHR-PWM
15h 31m1 stop
American Airlines Logo
12:08 pm - 6:50 amPWM-LHR
13h 42m1 stop
$785American Airlines
Find Deal
Tue, Aug 26 - Tue, Sep 2
Virgin Atlantic Logo
9:35 am - 10:00 pmLHR-PWM
17h 25m2 stops
Virgin Atlantic Logo
6:00 am - 6:20 amPWM-LHR
19h 20m2 stops
$881Virgin Atlantic
Find Deal
Sat, Sep 13 - Sat, Sep 20

United Airlines flights from London to Portland, Maine

Our best United Airlines deals on London to Portland, Maine flight tickets
United Airlines
Oct 25
LHR8:00 amLondon Heathrow
15h 38m
1 stop
PWM6:38 pmPortland
Oct 31
PWM6:00 amPortland
19h 55m
2 stops
LHR5:55 amLondon Heathrow
United Airlines
Sep 4
LHR7:30 amLondon Heathrow
16h 59m
2 stops
PWM7:29 pmPortland
Sep 9
PWM3:11 pmPortland
14h 29m
2 stops
LHR10:40 amLondon Heathrow
United Airlines
Sep 13
LHR7:25 amLondon Heathrow
17h 04m
2 stops
PWM7:29 pmPortland
Sep 20
PWM10:05 amPortland
15h 15m
2 stops
LHR6:20 amLondon Heathrow

American Airlines flights from London to Portland, Maine

Our best American Airlines deals on London to Portland, Maine flight tickets
American Airlines
Sep 4
LHR2:40 pmLondon Heathrow
14h 05m
2 stops
PWM11:45 pmPortland
Sep 9
PWM2:30 pmPortland
12h 35m
1 stop
LHR8:05 amLondon Heathrow
American Airlines
Aug 26
LHR10:05 amLondon Heathrow
15h 31m
1 stop
PWM8:36 pmPortland
Sep 2
PWM12:08 pmPortland
13h 42m
1 stop
LHR6:50 amLondon Heathrow
American Airlines
Sep 13
LHR10:05 amLondon Heathrow
12h 50m
1 stop
PWM5:55 pmPortland
Sep 20
PWM12:21 pmPortland
13h 29m
1 stop
LHR6:50 amLondon Heathrow

momondo Fare Finder

 
Customize your flight search to find flights from London 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 July 31, 2025.
Use the filters below to find and compare flights from London to Portland, Maine that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 9/15

8:15 am-10:07 pm

1 stop18h 52m

Portland

Mon 9/29

2:17 pm-8:45 pm

1 stop25h 28m

$552

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 9/15

8:15 am-10:07 pm

1 stop18h 52m

Portland

Mon 9/29

7:09 am-6:30 am

2 stops18h 21m

$608

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 9/4

8:15 am-10:02 pm

1 stop18h 47m

Portland

Tue 9/9

2:17 pm-8:45 pm

1 stop25h 28m

$610

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 9/15

12:45 pm-12:11 am

2 stops16h 26m

Portland

Mon 9/29

6:00 am-6:20 am

2 stops19h 20m

$672

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 10/25

8:00 am-6:38 pm

1 stop15h 38m

Portland

Fri 10/31

6:00 am-5:55 am

2 stops19h 55m

$721

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 9/4

2:40 pm-11:45 pm

2 stops14h 05m

Portland

Tue 9/9

2:30 pm-8:05 am

1 stop12h 35m

$755

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 9/13

8:55 am-5:55 pm

2 stops14h 00m

Portland

Sat 9/20

1:09 pm-7:50 am

2 stops13h 41m

$769

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 9/4

7:30 am-7:29 pm

2 stops16h 59m

Portland

Tue 9/9

3:11 pm-10:40 am

2 stops14h 29m

$782

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 8/26

10:05 am-8:36 pm

1 stop15h 31m

Portland

Tue 9/2

12:08 pm-6:50 am

1 stop13h 42m

$785

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 9/13

9:35 am-10:00 pm

2 stops17h 25m

Portland

Sat 9/20

6:00 am-6:20 am

2 stops19h 20m

$881

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Portland from

How to get the cheapest flight ticket from London 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 typical price of a round-trip flight between London and Portland, Maine?

What is the cheapest month to fly to Portland, Maine?

The cheapest month to fly to Portland, Maine from London is in February. Flight prices, which tend to average around $726, 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 September is also cheap. Prices for this month can be found on momondo for an average of $737.

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 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 to Portland, Maine

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

Cheap London to Portland, Maine (LON to PWM) flight deals and tips

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

Best Price Found

$627

Fastest flight time

11h 26m

Direct flights

None

Airports in Portland, Maine

1 airport
The best one-way flight to Portland, Maine from London in the past 72 hours is $627. The best round-trip flight deal from London to Portland, Maine found on momondo in the last 72 hours is $552.
The fastest flight from London to Portland, Maine takes 11h 26m
There are no direct flights from London to Portland, Maine. Popular non-direct route for this connection is London Heathrow Airport - Portland Airport.
There is 1 airport near Portland, Maine: Portland (PWM)

  • How far is London to Portland by plane?

    There are 3183.1 mi between London and Portland. By plane, this route typically takes 11h 26m.

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

    Prices for flights from London to Portland Airport were last updated today.

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

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

    The travel and health documents you'll need for your trip to Portland Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Portland Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.


Traveling to a place near Portland?

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

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Portland. momondo saves you time and could save you money on your trip.

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?

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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1 adult
Tue 8/5
Tue 8/12

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