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Cheap flights from London to Portland from $629

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Portland departing on 6/14. 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

Enter your travel dates to find the best prices.
JetBlue Logo
11:55 am - 10:59 pm
LHR
-
PWM
16h 04m
1 stop
JetBlue Logo
7:30 am - 8:45 pm
PWM
-
LHR
32h 15m
1 stop
$642JetBlue
Sun, Apr 19 - Sun, Apr 26
JetBlue Logo
8:15 am - 10:59 pm
LHR
-
PWM
19h 44m
1 stop
JetBlue Logo
7:30 am - 9:30 am
PWM
-
LHR
21h 00m
1 stop
$681JetBlue
Mon, Apr 20 - Mon, Apr 27
JetBlue Logo
11:55 am - 11:36 pm
LHR
-
PWM
16h 41m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$760JetBlue
Fri, May 1 - Tue, May 5
JetBlue Logo
11:55 am - 11:36 pm
LHR
-
PWM
16h 41m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$780JetBlue
Fri, May 1 - Tue, May 5
JetBlue Logo
11:55 am - 11:36 pm
LHR
-
PWM
16h 41m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$782JetBlue
Fri, May 1 - Tue, May 5
JetBlue Logo
11:55 am - 11:36 pm
LHR
-
PWM
16h 41m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$783JetBlue
Fri, May 1 - Tue, May 5
Scandinavian Airlines Logo
7:50 pm - 12:46 am
LHR
-
PWM
33h 56m
2 stops
Scandinavian Airlines Logo
6:30 am - 9:35 am
PWM
-
LHR
22h 05m
2 stops
$801Scandinavian Airlines
Mon, Apr 20 - Mon, Apr 27
United Airlines Logo
7:25 am - 6:58 pm
LHR
-
PWM
16h 33m
2 stops
United Airlines Logo
2:12 pm - 9:20 am
PWM
-
LHR
14h 08m
2 stops
$812United Airlines
Mon, Apr 20 - Mon, Apr 27
United Airlines Logo
7:25 am - 6:58 pm
LHR
-
PWM
16h 33m
2 stops
United Airlines Logo
7:33 pm - 6:55 am
PWM
-
LHR
30h 22m
1 stop
$823United Airlines
Sun, Apr 19 - Sun, Apr 26
Austrian Airlines Logo
9:30 am - 6:37 pm
LHR
-
PWM
14h 07m
1 stop
Austrian Airlines Logo
11:08 am - 5:55 am
PWM
-
LHR
13h 47m
1 stop
$837Austrian Airlines
Thu, Apr 23 - Thu, Apr 30

JetBlue flights from London to Portland, Maine

Our best JetBlue deals on London to Portland, Maine flight tickets
JetBlue
Apr 19
LHR11:55 amLondon Heathrow
16h 04m
1 stop
PWM10:59 pmPortland
Apr 26
PWM7:30 amPortland
32h 15m
1 stop
LHR8:45 pmLondon Heathrow
$642
JetBlue
Apr 20
LHR8:15 amLondon Heathrow
19h 44m
1 stop
PWM10:59 pmPortland
Apr 27
PWM7:30 amPortland
21h 00m
1 stop
LHR9:30 amLondon Heathrow
$681
JetBlue
May 1
LHR11:55 amLondon Heathrow
16h 41m
1 stop
PWM11:36 pmPortland
May 5
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
$760

Scandinavian Airlines flights from London to Portland, Maine

Our best Scandinavian Airlines deals on London to Portland, Maine flight tickets
Scandinavian Airlines
Apr 20
LHR7:50 pmLondon Heathrow
33h 56m
2 stops
PWM12:46 amPortland
Apr 27
PWM6:30 amPortland
22h 05m
2 stops
LHR9:35 amLondon Heathrow
$801
Scandinavian Airlines
Apr 20
LHR6:40 amLondon Heathrow
23h 06m
3 stops
PWM12:46 amPortland
Apr 27
PWM6:30 amPortland
27h 05m
2 stops
LHR2:35 pmLondon Heathrow
$865
Scandinavian Airlines
Apr 20
LHR6:40 amLondon Heathrow
23h 06m
3 stops
PWM12:46 amPortland
Apr 27
PWM2:51 pmPortland
18h 44m
3 stops
LHR2:35 pmLondon Heathrow
$926

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 March 10, 2026.
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

Cheapest round-trip

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sun 4/19

11:55 am-10:59 pm

1 stop16h 04m

Portland

Sun 4/26

7:30 am-8:45 pm

1 stop32h 15m

$642

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 4/20

8:15 am-10:59 pm

1 stop19h 44m

Portland

Mon 4/27

7:30 am-9:30 am

1 stop21h 00m

$681
Quickest round-trip

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 5/1

11:55 am-11:36 pm

1 stop16h 41m

Portland

Tue 5/5

6:00 am-8:45 pm

1 stop9h 45m

$760

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 5/1

11:55 am-11:36 pm

1 stop16h 41m

Portland

Tue 5/5

6:00 am-8:45 pm

1 stop9h 45m

$780

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 5/1

11:55 am-11:36 pm

1 stop16h 41m

Portland

Tue 5/5

6:00 am-8:45 pm

1 stop9h 45m

$782

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 5/1

11:55 am-11:36 pm

1 stop16h 41m

Portland

Tue 5/5

6:00 am-8:45 pm

1 stop9h 45m

$783

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 4/20

7:50 pm-12:46 am

2 stops33h 56m

Portland

Mon 4/27

6:30 am-9:35 am

2 stops22h 05m

$801

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 4/20

7:25 am-6:58 pm

2 stops16h 33m

Portland

Mon 4/27

2:12 pm-9:20 am

2 stops14h 08m

$812

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sun 4/19

7:25 am-6:58 pm

2 stops16h 33m

Portland

Sun 4/26

7:33 pm-6:55 am

1 stop30h 22m

$823

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 4/23

9:30 am-6:37 pm

1 stop14h 07m

Portland

Thu 4/30

11:08 am-5:55 am

1 stop13h 47m

$837

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 cheapest month to fly to Portland, Maine?

The cheapest month to fly to Portland, Maine from London is in October. Flight prices, which tend to average around $694, 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 October, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $696.

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

Fastest flight time

16h 23m

Direct flights

None
The fastest flight from London to Portland, Maine takes 16h 23m
There are no direct flights from London to Portland, Maine. There are no popular flight routes from London to Portland, Maine.
Search flight deals

  • How far is London to Portland by plane?

    There are 3183.1 mi between London and Portland. By plane, this route typically takes 16h 23m.

  • 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
Lewiston
Brunswick
Bartlett
Gorham
Auburn
Windham
Intervale
Oxford
Bath
Georgetown
Falmouth
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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