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Cheap flights from London to Portland from $511

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 9/21. 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
1 adult, Economy, 0 bags

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 - 12:25 am
LHR
-
PWM
17h 30m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$650JetBlue
Thu, Sep 3 - Thu, Sep 17
JetBlue Logo
8:15 am - 12:25 am
LHR
-
PWM
21h 10m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$652JetBlue
Fri, Sep 4 - Wed, Sep 16
JetBlue Logo
11:55 am - 12:25 am
LHR
-
PWM
17h 30m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$688JetBlue
Thu, Sep 3 - Wed, Sep 9
JetBlue Logo
8:15 am - 12:25 am
LHR
-
PWM
21h 10m
1 stop
JetBlue Logo
6:00 am - 9:30 am
PWM
-
LHR
22h 30m
1 stop
$698JetBlue
Thu, Sep 3 - Wed, Sep 9
JetBlue Logo
8:15 am - 11:52 pm
LHR
-
PWM
20h 37m
1 stop
JetBlue Logo
6:00 am - 9:30 am
PWM
-
LHR
22h 30m
1 stop
$701JetBlue
Sat, Sep 19 - Tue, Sep 29
JetBlue Logo
11:55 am - 1:45 pm
LHR
-
PWM
30h 50m
1 stop
JetBlue Logo
1:17 pm - 8:45 pm
PWM
-
LHR
26h 28m
1 stop
$707JetBlue
Tue, Sep 1 - Tue, Sep 8
JetBlue Logo
8:15 am - 12:25 am
LHR
-
PWM
21h 10m
1 stop
JetBlue Logo
6:00 am - 9:30 am
PWM
-
LHR
22h 30m
1 stop
$719JetBlue
Thu, Sep 3 - Wed, Sep 9
Scandinavian Airlines Logo
7:05 am - 12:59 am
LHR
-
PWM
22h 54m
2 stops
Scandinavian Airlines Logo
6:02 am - 9:35 am
PWM
-
LHR
22h 33m
2 stops
$729Scandinavian Airlines
Thu, Sep 3 - Wed, Sep 9
JetBlue Logo
11:55 am - 11:52 pm
LHR
-
PWM
16h 57m
1 stop
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
$738JetBlue
Wed, Sep 9 - Sun, Sep 13
JetBlue Logo
12:20 pm - 11:43 pm
LHR
-
PWM
15h 23m
1 stop
JetBlue Logo
6:30 am - 9:30 am
PWM
-
LHR
22h 00m
1 stop
$750JetBlue
Tue, Oct 27 - Thu, Nov 5

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Scandinavian Airlines flights from London to Portland, Maine

Our best Scandinavian Airlines deals on London to Portland, Maine flight tickets
Scandinavian Airlines
Sep 3
LHR7:05 amLondon Heathrow
22h 54m
2 stops
PWM12:59 amPortland
Sep 9
PWM6:02 amPortland
22h 33m
2 stops
LHR9:35 amLondon Heathrow
$729
Scandinavian Airlines
Sep 3
LHR5:30 pmLondon Heathrow
36h 29m
2 stops
PWM12:59 amPortland
Sep 9
PWM6:02 amPortland
22h 33m
2 stops
LHR9:35 amLondon Heathrow
$754
Scandinavian Airlines
Sep 3
LHR7:05 amLondon Heathrow
22h 54m
2 stops
PWM12:59 amPortland
Sep 9
PWM6:02 amPortland
22h 18m
3 stops
LHR9:20 amLondon Heathrow
$804

Finnair flights from London to Portland, Maine

Our best Finnair deals on London to Portland, Maine flight tickets
Finnair
Nov 16
LHR8:45 amLondon Heathrow
19h 12m
2 stops
PWM10:57 pmPortland
Nov 30
PWM6:47 pmPortland
33h 18m
2 stops
LHR9:05 amLondon Heathrow
$896
Finnair
Nov 2
LHR4:45 pmLondon Heathrow
35h 12m
2 stops
PWM10:57 pmPortland
Nov 15
PWM6:47 pmPortland
32h 03m
1 stop
LHR7:50 amLondon Heathrow
$904
Finnair
Sep 1
LHR10:05 amLondon Heathrow
16h 16m
2 stops
PWM9:21 pmPortland
Sep 8
PWM2:42 pmPortland
14h 33m
2 stops
LHR10:15 amLondon Heathrow
$921

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 25, 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 9/3

11:55 am-12:25 am

1 stop17h 30m

Portland

Thu 9/17

6:00 am-8:45 pm

1 stop9h 45m

$650

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 9/4

8:15 am-12:25 am

1 stop21h 10m

Portland

Wed 9/16

6:00 am-8:45 pm

1 stop9h 45m

$652

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 9/3

11:55 am-12:25 am

1 stop17h 30m

Portland

Wed 9/9

6:00 am-8:45 pm

1 stop9h 45m

$688

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 9/3

8:15 am-12:25 am

1 stop21h 10m

Portland

Wed 9/9

6:00 am-9:30 am

1 stop22h 30m

$698

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 9/19

8:15 am-11:52 pm

1 stop20h 37m

Portland

Tue 9/29

6:00 am-9:30 am

1 stop22h 30m

$701

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 9/1

11:55 am-1:45 pm

1 stop30h 50m

Portland

Tue 9/8

1:17 pm-8:45 pm

1 stop26h 28m

$707

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 9/3

8:15 am-12:25 am

1 stop21h 10m

Portland

Wed 9/9

6:00 am-9:30 am

1 stop22h 30m

$719

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 9/3

7:05 am-12:59 am

2 stops22h 54m

Portland

Wed 9/9

6:02 am-9:35 am

2 stops22h 33m

$729
Quickest round-trip

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Wed 9/9

11:55 am-11:52 pm

1 stop16h 57m

Portland

Sun 9/13

6:00 am-8:45 pm

1 stop9h 45m

$738

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 10/27

12:20 pm-11:43 pm

1 stop15h 23m

Portland

Thu 11/5

6:30 am-9:30 am

1 stop22h 00m

$750

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?

Prices are currently low for flights on this route.

Typical prices usually range from $976 to $2,607.
The lowest price recently found on this route was $650.

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 $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 April is also cheap. Prices for this month can be found on momondo for an average of $745.

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

15h 23m

Direct flights

None
The fastest flight from London to Portland, Maine takes 15h 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

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 15h 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
Lewiston
Brunswick
Conway
Freeport
Bartlett
Gorham
Auburn
Windham
Bath
Intervale
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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