What airlines fly to United Kingdom?

British Airways, Delta and Aer Lingus are the top three most popular airlines that fly to United Kingdom from Portland, Maine according to our data. British Airways is the first choice among our users, with 40% of people opting to fly with this airline when traveling to United Kingdom. Keep in mind that there are 17 different airlines that fly to United Kingdom on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Portland to United Kingdom?

KLM, United Airlines, and American Airlines are the most popular carriers operating from Portland to United Kingdom

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?

As of October 2026, there are 4 operators available to choose from 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.

$290 Cheap Flights from Portland, Maine to the United Kingdom in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Portland, Maine to the United Kingdom

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:41 pm - 11:15 amPWM Portland-LHR London Heathrow

14h 34m2 stops Newark Zurich

9:00 am - 11:21 pmLHR London Heathrow-PWM Portland

43h 21m2 stops Halifax Intl Newark

$766United Airlines

Mon, Nov 16 - Wed, Nov 18

8:49 am - 9:10 amPWM Portland-LHR London Heathrow

19h 21m1 stop Newark

6:50 am - 11:21 pmLHR London Heathrow-PWM Portland

21h 31m2 stops Brussels Bruxelles-National Newark

$767United Airlines

Mon, Nov 16 - Wed, Nov 18

9:46 am - 7:10 amPWM Portland-LHR London Heathrow

16h 24m2 stops Washington, D.C. Dulles Intl Montreal Pierre Elliott Trudeau Intl

6:00 am - 11:21 pmLHR London Heathrow-PWM Portland

22h 21m3 stops Zurich Toronto Pearson Intl Newark

$778Multiple Airlines

Tue, Nov 10 - Thu, Nov 12

8:49 am - 7:10 amPWM Portland-LHR London Heathrow

17h 21m3 stops Newark Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

6:00 am - 11:21 pmLHR London Heathrow-PWM Portland

22h 21m3 stops Zurich Toronto Pearson Intl Newark

$786Air Canada

Tue, Nov 10 - Thu, Nov 12

5:30 am - 8:45 amPWM Portland-MAN Manchester

22h 15m1 stop Atlanta Hartsfield-Jackson

2:55 pm - 11:55 pmMAN Manchester-PWM Portland

14h 00m1 stop New York John F Kennedy Intl

$932Delta

Wed, Jan 27 - Sun, Jan 31

3:10 pm - 4:05 pmPWM Portland-MAN Manchester

19h 55m2 stops New York John F Kennedy Intl Paris Charles de Gaulle

2:55 pm - 11:55 pmMAN Manchester-PWM Portland

14h 00m1 stop New York John F Kennedy Intl

$937Delta

Wed, Jan 27 - Sun, Jan 31

11:01 am - 1:35 pmPWM Portland-GLA Glasgow Intl

21h 34m2 stops Philadelphia London Heathrow

9:30 am - 11:27 pmGLA Glasgow Intl-PWM Portland

18h 57m2 stops London Heathrow Chicago O'Hare Intl

$939American Airlines

Thu, Apr 1 - Fri, Apr 9

12:50 pm - 12:50 pmPWM Portland-GLA Glasgow Intl

19h 00m2 stops Chicago O'Hare Intl London Heathrow

9:30 am - 11:56 amGLA Glasgow Intl-PWM Portland

31h 26m2 stops London Heathrow Chicago O'Hare Intl

$975American Airlines

Wed, Nov 18 - Thu, Nov 26

12:50 pm - 10:10 amPWM Portland-MAN Manchester

16h 20m2 stops Detroit Metropolitan Wayne County Amsterdam Schiphol

2:55 pm - 11:49 pmMAN Manchester-PWM Portland

13h 54m1 stop New York John F Kennedy Intl

$997KLM

Thu, Apr 15 - Sat, May 1

12:50 pm - 10:10 amPWM Portland-MAN Manchester

16h 20m2 stops Detroit Metropolitan Wayne County Amsterdam Schiphol

6:00 am - 4:13 pmMAN Manchester-PWM Portland

15h 13m2 stops Amsterdam Schiphol Detroit Metropolitan Wayne County

$1,004KLM

Thu, Apr 15 - Sat, May 1

Cheap last minute flights

Enter your travel dates to find the best prices.

2:05 pm - 6:40 amPWM Portland-LHR London Heathrow

11h 35m1 stop Washington, D.C. Dulles Intl

9:00 am - 11:21 pmLHR London Heathrow-PWM Portland

19h 21m2 stops Zurich Newark

$874United Airlines

Wed, Nov 4 - Sun, Nov 15

8:49 am - 7:10 amPWM Portland-LHR London Heathrow

17h 21m2 stops Newark Montreal Pierre Elliott Trudeau Intl

9:00 am - 11:21 pmLHR London Heathrow-PWM Portland

19h 21m2 stops Zurich Newark

$877United Airlines

Wed, Nov 4 - Sun, Nov 15

12:42 pm - 7:45 amPWM Portland-LHR London Heathrow

14h 03m1 stop Detroit Metropolitan Wayne County

4:35 pm - 12:19 amLHR London Heathrow-PWM Portland

12h 44m1 stop New York John F Kennedy Intl

$905Delta

Wed, Nov 4 - Sun, Nov 15

4:15 pm - 10:30 amPWM Portland-EDI Edinburgh Turnhouse

13h 15m2 stops New York John F Kennedy Intl Paris Charles de Gaulle

11:35 am - 12:10 amEDI Edinburgh Turnhouse-PWM Portland

17h 35m1 stop New York John F Kennedy Intl

$1,202Air France

Tue, Nov 3 - Fri, Nov 6

11:07 am - 9:05 amPWM Portland-EDI Edinburgh Turnhouse

16h 58m1 stop Philadelphia

11:05 am - 10:57 pmEDI Edinburgh Turnhouse-PWM Portland

16h 52m1 stop Philadelphia

$1,208American Airlines

Tue, Nov 3 - Fri, Nov 6

4:15 pm - 10:30 amPWM Portland-EDI Edinburgh Turnhouse

13h 15m2 stops New York John F Kennedy Intl Paris Charles de Gaulle

5:40 am - 9:00 pmEDI Edinburgh Turnhouse-PWM Portland

20h 20m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

$1,209Multiple Airlines

Tue, Nov 3 - Fri, Nov 6

12:42 pm - 10:30 amPWM Portland-EDI Edinburgh Turnhouse

16h 48m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

11:35 am - 12:10 amEDI Edinburgh Turnhouse-PWM Portland

17h 35m1 stop New York John F Kennedy Intl

$1,211Delta

Tue, Nov 3 - Fri, Nov 6

10:31 am - 9:05 amPWM Portland-EDI Edinburgh Turnhouse

17h 34m2 stops Washington, D.C. Reagan-National Philadelphia

11:05 am - 11:54 pmEDI Edinburgh Turnhouse-PWM Portland

17h 49m2 stops Philadelphia Washington, D.C. Reagan-National

$1,212American Airlines

Tue, Nov 3 - Fri, Nov 6

11:55 am - 10:30 amPWM Portland-LHR London Heathrow

17h 35m2 stops Minneapolis St Paul Paris Charles de Gaulle

6:30 am - 9:00 pmLHR London Heathrow-PWM Portland

19h 30m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

$1,265Delta

Sun, Nov 1 - Thu, Nov 5

6:00 am - 8:35 pmPWM Portland-LHR London Heathrow

10h 35m1 stop Newark

9:10 am - 7:02 pmLHR London Heathrow-PWM Portland

14h 52m2 stops Newark Washington, D.C. Dulles Intl

$9,473United Airlines

Sat, Oct 31 - Thu, Nov 5

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Delta flights from Portland, Maine to United Kingdom

Our best Delta deals on Portland, Maine to United Kingdom flight tickets

Delta

Nov 5

PWM12:42 pmPortland

14h 03m

1 stop

LHR7:45 amLondon Heathrow

Nov 18

LHR8:40 amLondon Heathrow

19h 51m

2 stops

PWM11:31 pmPortland

$876

Delta

Dec 29

PWM1:20 pmPortland

12h 55m

1 stop

LHR7:15 amLondon Heathrow

Jan 12

LHR6:30 amLondon Heathrow

22h 25m

2 stops

PWM11:55 pmPortland

$879

Delta

Nov 5

PWM4:15 pmPortland

13h 15m

2 stops

LHR10:30 amLondon Heathrow

Nov 18

LHR8:40 amLondon Heathrow

19h 51m

2 stops

PWM11:31 pmPortland

$881

United Airlines flights from Portland, Maine to United Kingdom

Our best United Airlines deals on Portland, Maine to United Kingdom flight tickets

United Airlines

Nov 16

PWM3:41 pmPortland

14h 34m

2 stops

LHR11:15 amLondon Heathrow

Nov 18

LHR9:00 amLondon Heathrow

43h 21m

2 stops

PWM11:21 pmPortland

$766

United Airlines

Nov 16

PWM8:49 amPortland

19h 21m

1 stop

LHR9:10 amLondon Heathrow

Nov 18

LHR6:50 amLondon Heathrow

21h 31m

2 stops

PWM11:21 pmPortland

$767

United Airlines

Nov 16

PWM3:41 pmPortland

19h 39m

2 stops

LHR4:20 pmLondon Heathrow

Nov 18

LHR9:00 amLondon Heathrow

43h 21m

2 stops

PWM11:21 pmPortland

$771

momondo Fare Finder

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

Cheapest round-trip

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 11/16

3:41 pm-11:15 am

2 stops14h 34m

London Heathrow

Wed 11/18

9:00 am-11:21 pm

2 stops43h 21m

$766

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 11/16

8:49 am-9:10 am

1 stop19h 21m

London Heathrow

Wed 11/18

6:50 am-11:21 pm

2 stops21h 31m

$767

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/10

9:46 am-7:10 am

2 stops16h 24m

London Heathrow

Thu 11/12

6:00 am-11:21 pm

3 stops22h 21m

$778

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/10

8:49 am-7:10 am

3 stops17h 21m

London Heathrow

Thu 11/12

6:00 am-11:21 pm

3 stops22h 21m

$786

PortlandManchester

PWM Portland - MAN Manchester

PWMMAN

Portland

Wed 1/27

5:30 am-8:45 am

1 stop22h 15m

Manchester

Sun 1/31

2:55 pm-11:55 pm

1 stop14h 00m

$932

PortlandManchester

PWM Portland - MAN Manchester

PWMMAN

Portland

Wed 1/27

3:10 pm-4:05 pm

2 stops19h 55m

Manchester

Sun 1/31

2:55 pm-11:55 pm

1 stop14h 00m

$937

PortlandGlasgow

PWM Portland - GLA Glasgow Intl

PWMGLA

Portland

Thu 4/1

11:01 am-1:35 pm

2 stops21h 34m

Glasgow Intl

Fri 4/9

9:30 am-11:27 pm

2 stops18h 57m

$939

PortlandGlasgow

PWM Portland - GLA Glasgow Intl

PWMGLA

Portland

Wed 11/18

12:50 pm-12:50 pm

2 stops19h 00m

Glasgow Intl

Thu 11/26

9:30 am-11:56 am

2 stops31h 26m

$975

Quickest round-trip

PortlandManchester

PWM Portland - MAN Manchester

PWMMAN

Portland

Thu 4/15

12:50 pm-10:10 am

2 stops16h 20m

Manchester

Sat 5/1

2:55 pm-11:49 pm

1 stop13h 54m

$997

PortlandManchester

PWM Portland - MAN Manchester

PWMMAN

Portland

Thu 4/15

12:50 pm-10:10 am

2 stops16h 20m

Manchester

Sat 5/1

6:00 am-4:13 pm

2 stops15h 13m

$1,004

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

What is the cheapest month to fly to United Kingdom?

In general, January 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 $0. If you aren’t able to travel to United Kingdom during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $752.

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

You could potentially save up to 4% 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

Best Price Found	$290
Fastest flight time	10h 06m
Direct flights	None

The best one-way flight to United Kingdom from Portland, Maine in the past 72 hours is $290. The best round-trip flight deal from Portland, Maine to United Kingdom found on momondo in the last 72 hours is $766.

The fastest flight from Portland, Maine to United Kingdom takes 10h 06m

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

Frequently asked questions about flying from Portland, Maine to the United Kingdom

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?
As of October 2026, there are 4 operators available to choose from 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
American Airlines	PriceFrom $666	Free Cancellation	Rating 7.0 12,201 reviews	Search American Airlines flights
United Airlines	PriceFrom $752	Free Cancellation	Rating 7.3 10,443 reviews	Search United Airlines flights
KLM	PriceFrom $1,112	Free Cancellation	Rating 7.8 1,595 reviews	Search KLM flights
Delta	PriceFrom $1,112	Free Cancellation	Rating 7.8 8,681 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.