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Cheap flights from London to Portland from $581

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 6/4. 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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Find the cheapest flights from London to Portland

Cheap round-trip flights

Enter your travel dates to find the best prices.
JetBlue Logo
11:55 am - 1:35 pm
LHR
-
PWM
30h 40m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$829JetBlue
Thu, May 28 - Thu, Jun 4
JetBlue Logo
8:15 am - 12:14 am
LHR
-
PWM
20h 59m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$876JetBlue
Thu, Jul 9 - Thu, Jul 16
JetBlue Logo
8:15 am - 11:58 pm
LHR
-
PWM
20h 43m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$902JetBlue
Thu, Jun 4 - Thu, Jun 11
JetBlue Logo
8:15 am - 11:58 pm
LHR
-
PWM
20h 43m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$941JetBlue
Fri, Jun 5 - Fri, Jun 12
JetBlue Logo
8:40 am - 11:58 pm
LHR
-
PWM
20h 18m
2 stops
JetBlue Logo
2:37 pm - 9:30 am
PWM
-
LHR
13h 53m
1 stop
$990JetBlue
Mon, Jun 1 - Mon, Jun 8
Multiple Airlines Logo
7:50 pm - 12:30 pm
LHR
-
PWM
45h 40m
2 stops
Multiple Airlines Logo
8:15 pm - 9:00 pm
PWM
-
LHR
43h 45m
2 stops
$1,003Multiple Airlines
Sun, Jun 21 - Fri, Aug 7
JetBlue Logo
8:15 am - 11:03 pm
LHR
-
PWM
19h 48m
1 stop
JetBlue Logo
2:36 pm - 9:30 am
PWM
-
LHR
13h 54m
1 stop
$1,015JetBlue
Mon, May 18 - Mon, May 25
Virgin Atlantic Logo
11:15 am - 11:09 pm
LHR
-
PWM
16h 54m
1 stop
Virgin Atlantic Logo
6:57 pm - 1:15 pm
PWM
-
LHR
13h 18m
1 stop
$1,025Virgin Atlantic
Mon, Jun 1 - Mon, Jun 8
Delta Logo
8:40 am - 11:09 pm
LHR
-
PWM
19h 29m
2 stops
Delta Logo
4:50 pm - 1:15 pm
PWM
-
LHR
15h 25m
2 stops
$1,046Delta
Mon, Jun 1 - Mon, Jun 8
Multiple Airlines Logo
8:15 am - 11:58 pm
LHR
-
PWM
20h 43m
1 stop
Multiple Airlines Logo
4:50 pm - 1:05 pm
PWM
-
LHR
15h 15m
2 stops
$1,060Multiple Airlines
Thu, Jun 4 - Thu, Jun 11

JetBlue flights from London to Portland, Maine

Our best JetBlue deals on London to Portland, Maine flight tickets
JetBlue
May 28
LHR11:55 amLondon Heathrow
30h 40m
1 stop
PWM1:35 pmPortland
Jun 4
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
$829
JetBlue
Jul 9
LHR8:15 amLondon Heathrow
20h 59m
1 stop
PWM12:14 amPortland
Jul 16
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
$876
JetBlue
Jun 4
LHR8:15 amLondon Heathrow
20h 43m
1 stop
PWM11:58 pmPortland
Jun 11
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
$902

United Airlines flights from London to Portland, Maine

Our best United Airlines deals on London to Portland, Maine flight tickets
United Airlines
Jul 9
LHR1:50 pmLondon Heathrow
14h 40m
2 stops
PWM11:30 pmPortland
Jul 16
PWM6:00 amPortland
19h 55m
2 stops
LHR6:55 amLondon Heathrow
$1,101
United Airlines
Jun 4
LHR10:50 amLondon Heathrow
17h 40m
2 stops
PWM11:30 pmPortland
Jun 11
PWM6:00 amPortland
9h 40m
1 stop
LHR8:40 pmLondon Heathrow
$1,105
United Airlines
May 21
LHR10:25 amLondon Heathrow
13h 00m
1 stop
PWM6:25 pmPortland
May 28
PWM7:16 pmPortland
10h 24m
1 stop
LHR10:40 amLondon Heathrow
$1,137

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 April 24, 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

Thu 5/28

11:55 am-1:35 pm

1 stop30h 40m

Portland

Thu 6/4

6:00 am-8:45 pm

1 stop9h 45m

$829

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 7/9

8:15 am-12:14 am

1 stop20h 59m

Portland

Thu 7/16

6:00 am-8:45 pm

1 stop9h 45m

$876

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 6/4

8:15 am-11:58 pm

1 stop20h 43m

Portland

Thu 6/11

6:00 am-8:45 pm

1 stop9h 45m

$902

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 6/5

8:15 am-11:58 pm

1 stop20h 43m

Portland

Fri 6/12

6:00 am-8:45 pm

1 stop9h 45m

$941

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 6/1

8:40 am-11:58 pm

2 stops20h 18m

Portland

Mon 6/8

2:37 pm-9:30 am

1 stop13h 53m

$990

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sun 6/21

7:50 pm-12:30 pm

2 stops45h 40m

Portland

Fri 8/7

8:15 pm-9:00 pm

2 stops43h 45m

$1,003

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 5/18

8:15 am-11:03 pm

1 stop19h 48m

Portland

Mon 5/25

2:36 pm-9:30 am

1 stop13h 54m

$1,015
Quickest round-trip

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 6/1

11:15 am-11:09 pm

1 stop16h 54m

Portland

Mon 6/8

6:57 pm-1:15 pm

1 stop13h 18m

$1,025

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 6/1

8:40 am-11:09 pm

2 stops19h 29m

Portland

Mon 6/8

4:50 pm-1:15 pm

2 stops15h 25m

$1,046

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 6/4

8:15 am-11:58 pm

1 stop20h 43m

Portland

Thu 6/11

4:50 pm-1:05 pm

2 stops15h 15m

$1,060

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 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

14h 44m

Direct flights

None
The fastest flight from London to Portland, Maine takes 14h 44m
There are no direct flights from London to Portland, Maine. There are no popular flight routes from London to Portland, Maine.
Search flight deals

Frequently asked questions about flying from London to Portland, Maine

  • How far is London to Portland by plane?

    There are 3183.1 mi between London and Portland. By plane, this route typically takes 14h 44m.

  • 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
Bath
Oxford
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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