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Cheap flights from Portland, Maine to the United Kingdom from $406

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to the United Kingdom departing on 2/1. 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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Find the cheapest flights from Portland, Maine to the United Kingdom

Cheap round-trip flights

JetBlue Logo
2:17 pm - 9:30 amPWM-LHR
14h 13m1 stop
JetBlue Logo
8:15 am - 10:06 pmLHR-PWM
18h 51m1 stop
$641JetBlue
Find Deal
Wed, Sep 24 - Wed, Oct 1
JetBlue Logo
2:17 pm - 9:30 amPWM-LHR
14h 13m1 stop
JetBlue Logo
8:15 am - 10:07 pmLHR-PWM
18h 52m1 stop
$659JetBlue
Find Deal
Thu, Sep 11 - Mon, Sep 15
Scandinavian Airlines Logo
6:33 am - 2:35 pmPWM-LHR
27h 02m2 stops
Scandinavian Airlines Logo
7:05 am - 12:34 amLHR-PWM
22h 29m2 stops
$667Scandinavian Airlines
Find Deal
Fri, Sep 12 - Mon, Sep 15
Scandinavian Airlines Logo
2:41 pm - 2:35 pmPWM-LHR
18h 54m3 stops
Scandinavian Airlines Logo
7:05 am - 12:34 amLHR-PWM
22h 29m2 stops
$686Scandinavian Airlines
Find Deal
Fri, Sep 12 - Mon, Sep 15
Delta Logo
12:45 pm - 12:05 pmPWM-EDI
18h 20m2 stops
Delta Logo
11:45 am - 12:05 amEDI-PWM
17h 20m2 stops
$718Delta
Find Deal
Tue, Oct 7 - Tue, Oct 14
United Airlines Logo
3:45 pm - 8:05 amPWM-EDI
11h 20m1 stop
United Airlines Logo
9:40 am - 7:41 pmEDI-PWM
15h 01m2 stops
$722United Airlines
Find Deal
Thu, Sep 25 - Thu, Oct 2
Delta Logo
2:41 pm - 8:10 amPWM-GLA
12h 29m2 stops
Delta Logo
8:55 am - 12:05 amGLA-PWM
20h 10m2 stops
$746Delta
Find Deal
Tue, Sep 30 - Tue, Oct 7
United Airlines Logo
10:05 am - 6:55 amPWM-LHR
15h 50m1 stop
United Airlines Logo
2:05 pm - 2:33 pmLHR-PWM
29h 28m2 stops
$747United Airlines
Find Deal
Wed, Sep 24 - Wed, Oct 1
American Airlines Logo
3:28 pm - 11:05 amPWM-LHR
14h 37m1 stop
American Airlines Logo
1:10 pm - 8:22 pmLHR-PWM
11h 12m1 stop
$749American Airlines
Find Deal
Wed, Oct 8 - Wed, Oct 29
American Airlines Logo
12:33 pm - 6:35 amPWM-LHR
13h 02m1 stop
American Airlines Logo
10:05 am - 10:29 pmLHR-PWM
17h 24m1 stop
$750American Airlines
Find Deal
Tue, Dec 2 - Tue, Jan 13

Scandinavian Airlines flights from Portland, Maine to United Kingdom

Our best Scandinavian Airlines deals on Portland, Maine to United Kingdom flight tickets
Scandinavian Airlines
Sep 12
PWM6:33 amPortland
27h 02m
2 stops
LHR2:35 pmLondon Heathrow
Sep 15
LHR7:05 amLondon Heathrow
22h 29m
2 stops
PWM12:34 amPortland
$667
Find similar
Scandinavian Airlines
Sep 12
PWM2:41 pmPortland
18h 54m
3 stops
LHR2:35 pmLondon Heathrow
Sep 15
LHR7:05 amLondon Heathrow
22h 29m
2 stops
PWM12:34 amPortland
$686
Find similar
Scandinavian Airlines
Sep 5
PWM6:31 amPortland
28h 29m
2 stops
LHR4:00 pmLondon Heathrow
Sep 16
LHR10:35 amLondon Heathrow
42h 59m
2 stops
PWM12:34 amPortland
$820
Find similar

Air Canada flights from Portland, Maine to United Kingdom

Our best Air Canada deals on Portland, Maine to United Kingdom flight tickets
Air Canada
Dec 2
PWM6:00 amPortland
20h 10m
2 stops
LHR7:10 amLondon Heathrow
Jan 13
LHR1:25 pmLondon Heathrow
34h 25m
2 stops
PWM6:50 pmPortland
$748
Find similar
Air Canada
Oct 8
PWM8:00 amPortland
17h 30m
2 stops
LHR6:30 amLondon Heathrow
Oct 29
LHR6:00 pmLondon Heathrow
33h 17m
2 stops
PWM11:17 pmPortland
$753
Find similar
Air Canada
Oct 3
PWM6:00 amPortland
19h 30m
2 stops
LHR6:30 amLondon Heathrow
Oct 7
LHR2:05 pmLondon Heathrow
31h 39m
2 stops
PWM4:44 pmPortland
$797
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland, Maine to United Kingdom 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 August 28, 2025.
Use the filters below to find and compare flights from Portland, Maine to the United Kingdom that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 9/24

2:17 pm-9:30 am

1 stop14h 13m

London Heathrow

Wed 10/1

8:15 am-10:06 pm

1 stop18h 51m

$641

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 9/11

2:17 pm-9:30 am

1 stop14h 13m

London Heathrow

Mon 9/15

8:15 am-10:07 pm

1 stop18h 52m

$659

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 9/12

6:33 am-2:35 pm

2 stops27h 02m

London Heathrow

Mon 9/15

7:05 am-12:34 am

2 stops22h 29m

$667

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 9/12

2:41 pm-2:35 pm

3 stops18h 54m

London Heathrow

Mon 9/15

7:05 am-12:34 am

2 stops22h 29m

$686

PortlandEdinburgh

PWM - EDI

PWMEDI

Portland

Tue 10/7

12:45 pm-12:05 pm

2 stops18h 20m

Edinburgh Turnhouse

Tue 10/14

11:45 am-12:05 am

2 stops17h 20m

$718

PortlandEdinburgh

PWM - EDI

PWMEDI

Portland

Thu 9/25

3:45 pm-8:05 am

1 stop11h 20m

Edinburgh Turnhouse

Thu 10/2

9:40 am-7:41 pm

2 stops15h 01m

$722

PortlandGlasgow

PWM - GLA

PWMGLA

Portland

Tue 9/30

2:41 pm-8:10 am

2 stops12h 29m

Glasgow Intl

Tue 10/7

8:55 am-12:05 am

2 stops20h 10m

$746

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 9/24

10:05 am-6:55 am

1 stop15h 50m

London Heathrow

Wed 10/1

2:05 pm-2:33 pm

2 stops29h 28m

$747

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 10/8

3:28 pm-11:05 am

1 stop14h 37m

London Heathrow

Wed 10/29

1:10 pm-8:22 pm

1 stop11h 12m

$749

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 12/2

12:33 pm-6:35 am

1 stop13h 02m

London Heathrow

Tue 1/13

10:05 am-10:29 pm

1 stop17h 24m

$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 the United Kingdom from

How to get the cheapest flight ticket from Portland, Maine to United Kingdom

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 United Kingdom?

In general, October is the cheapest month to fly from Portland, Maine to United Kingdom. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $677. If you aren’t able to travel to United Kingdom during the month of October, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $729.

What is the cheapest day to depart on your flight to United Kingdom?

The cheapest day to depart from Portland, Maine to United Kingdom is on a Tuesday when prices can be found for as low as $788. The most expensive day to fly to United Kingdom is Friday, with ticket prices averaging around $936.

What is the cheapest time of day to depart on your flight to United Kingdom?

According to our data, the cheapest time of day to fly to United Kingdom is at noon. momondo users have found flights departing from Portland, Maine to United Kingdom at noon for as low as $827. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to United Kingdom are more costly in the afternoon, with an average ticket price of $869. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Portland, Maine to United Kingdom flights?

You could potentially save up to 8% on your flight if you consider stops on a Portland, Maine to United Kingdom flight.

Cheap Portland, Maine to United Kingdom flight deals and tips

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

Direct flights

None
There are no direct flights from Portland, Maine to United Kingdom. There are no popular flight routes from Portland, Maine to United Kingdom.
Search flight deals

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

    Prices for flights from Portland Airport to United Kingdom refresh daily.

  • How many operators does momondo search for flights from Portland Airport to United Kingdom?

  • How old do you have to be to fly from Portland Airport to United Kingdom?

    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 Portland Airport to United Kingdom.

  • What documentation or ID do you need to fly to United Kingdom?

    The required travel and health documents for your United Kingdom 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 United Kingdom. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Portland, Maine to United Kingdom

Compare and see reviews for airlines that fly from Portland, Maine to United Kingdom with momondo
Airline
Rating
Free Cancellation
Price
JetBluePriceFrom $586Free CancellationRating
7.2
2,920 reviews
Search JetBlue flights
United AirlinesPriceFrom $648Free CancellationRating
7.4
8,944 reviews
Search United Airlines flights
DeltaPriceFrom $825Free CancellationRating
7.9
7,977 reviews
Search Delta flights

Why use momondo?

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

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

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

Yes. momondo enables you to select and highlight flights to United Kingdom from Portland with this policy.

How can momondo help me find flights from Portland to United Kingdom?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to United Kingdom from Portland.

I’m not ready to book a flight from Portland to United Kingdom right now. Can momondo alert me if prices change?

If you are simply researching potential flights to United Kingdom, momondo offers a useful price alert feature which will track prices for flights to United Kingdom from Portland and alert you when they change.

An easier way to manage your United Kingdom trip

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Find better results for your trip to the United Kingdom

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo
Flights to Londonfrom $322
Flights to Manchesterfrom $389
Flights to Edinburghfrom $391
Flights to Birminghamfrom $402
Flights to Glasgowfrom $395
Flights to Belfastfrom $499
Flights to Newcastle upon Tynefrom $474
Flights to Bristolfrom $460
Flights to Invernessfrom $419
Flights to Liverpoolfrom $448
Flights to Aberdeenfrom $500
Flights to Leedsfrom $429