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

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

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 41% 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.

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 September 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.

$320 Cheap Flights from Portland, Maine to the United Kingdom in 2026

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.

12:45 pm - 6:50 amPWM Portland-LHR London Heathrow

13h 05m1 stop Detroit Metropolitan Wayne County

6:30 am - 12:19 amLHR London Heathrow-PWM Portland

22h 49m2 stops Amsterdam Schiphol New York John F Kennedy Intl

$739Delta

Tue, Nov 10 - Tue, Nov 17

4:20 pm - 8:50 amPWM Portland-LHR London Heathrow

11h 30m1 stop New York John F Kennedy Intl

11:45 am - 12:10 amLHR London Heathrow-PWM Portland

17h 25m2 stops Amsterdam Schiphol New York John F Kennedy Intl

$739Delta

Mon, Oct 5 - Tue, Oct 20

4:15 pm - 10:30 amPWM Portland-LHR London Heathrow

13h 15m1 stop New York John F Kennedy Intl

11:45 am - 12:19 amLHR London Heathrow-PWM Portland

17h 34m2 stops Amsterdam Schiphol New York John F Kennedy Intl

$740Multiple Airlines

Wed, Nov 4 - Thu, Nov 12

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

$745United Airlines

Mon, Nov 16 - Wed, Nov 18

4:15 pm - 8:05 amPWM Portland-LHR London Heathrow

10h 50m1 stop New York John F Kennedy Intl

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

12h 44m1 stop New York John F Kennedy Intl

$746KLM

Wed, Nov 4 - Tue, Nov 10

4:03 pm - 9:40 amPWM Portland-EDI Edinburgh Turnhouse

12h 37m1 stop New York John F Kennedy Intl

11:35 am - 12:19 amEDI Edinburgh Turnhouse-PWM Portland

17h 44m1 stop New York John F Kennedy Intl

$822KLM

Thu, Nov 12 - Mon, Nov 16

5:50 am - 7:55 amPWM Portland-EDI Edinburgh Turnhouse

21h 05m1 stop Newark

9:25 am - 11:21 pmEDI Edinburgh Turnhouse-PWM Portland

18h 56m1 stop Newark

$862United Airlines

Thu, Nov 12 - Mon, Nov 16

5:45 pm - 2:35 pmPWM Portland-GLA Glasgow Intl

16h 50m2 stops Chicago O'Hare Intl London Heathrow

9:05 am - 10:57 pmGLA Glasgow Intl-PWM Portland

18h 52m2 stops London Heathrow Philadelphia

$912American Airlines

Sun, Oct 25 - Sun, Nov 1

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

$932American Airlines

Thu, Nov 12 - Tue, Nov 17

5:37 pm - 3:15 pmPWM Portland-GLA Glasgow Intl

17h 38m2 stops Washington, D.C. Reagan-National London Heathrow

8:00 am - 11:54 pmGLA Glasgow Intl-PWM Portland

20h 54m2 stops London Heathrow Washington, D.C. Dulles Intl

$942Multiple Airlines

Fri, Oct 30 - Fri, Nov 6

Cheap last minute flights

Enter your travel dates to find the best prices.

2:38 pm - 6:55 amPWM Portland-LHR London Heathrow

11h 17m1 stop Washington, D.C. Dulles Intl

6:50 am - 7:24 pmLHR London Heathrow-PWM Portland

17h 34m2 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl

$1,000United Airlines

Tue, Sep 15 - Thu, Sep 17

6:00 am - 8:45 pmPWM Portland-LHR London Heathrow

9h 45m1 stop New York John F Kennedy Intl

8:15 am - 11:54 pmLHR London Heathrow-PWM Portland

20h 39m1 stop New York John F Kennedy Intl

$1,004JetBlue

Tue, Sep 15 - Thu, Sep 17

3:43 pm - 10:40 amPWM Portland-LHR London Heathrow

13h 57m2 stops Newark Washington, D.C. Dulles Intl

6:50 am - 6:29 pmLHR London Heathrow-PWM Portland

16h 39m2 stops Brussels Bruxelles-National Newark

$1,005United Airlines

Tue, Sep 15 - Thu, Sep 17

6:00 am - 9:30 amPWM Portland-LHR London Heathrow

22h 30m1 stop New York John F Kennedy Intl

8:15 am - 11:54 pmLHR London Heathrow-PWM Portland

20h 39m1 stop New York John F Kennedy Intl

$1,043JetBlue

Thu, Sep 17 - Sat, Sep 19

2:38 pm - 6:55 amPWM Portland-LHR London Heathrow

11h 17m1 stop Washington, D.C. Dulles Intl

6:50 am - 11:59 pmLHR London Heathrow-PWM Portland

22h 09m2 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl

$1,100United Airlines

Thu, Sep 17 - Sat, Sep 19

6:06 am - 6:55 amPWM Portland-LHR London Heathrow

19h 49m2 stops Newark Washington, D.C. Dulles Intl

6:50 am - 11:32 pmLHR London Heathrow-PWM Portland

21h 42m2 stops Brussels Bruxelles-National Newark

$1,105United Airlines

Thu, Sep 17 - Sat, Sep 19

6:00 am - 9:00 amPWM Portland-LGW London Gatwick

22h 00m2 stops New York John F Kennedy Intl Frankfurt am Main

7:35 pm - 11:54 pmLGW London Gatwick-PWM Portland

33h 19m2 stops Frankfurt am Main New York John F Kennedy Intl

$1,231Multiple Airlines

Tue, Sep 15 - Thu, Sep 17

9:10 am - 6:30 amPWM Portland-LHR London Heathrow

16h 20m3 stops Newark Toronto Pearson Intl Ottawa

2:10 pm - 11:59 pmLHR London Heathrow-PWM Portland

14h 49m2 stops Ottawa Washington, D.C. Dulles Intl

$1,268Multiple Airlines

Thu, Sep 17 - Sat, Sep 19

9:10 am - 6:30 amPWM Portland-LHR London Heathrow

16h 20m3 stops Newark Toronto Pearson Intl Ottawa

8:30 am - 11:32 pmLHR London Heathrow-PWM Portland

20h 02m3 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl Newark

$1,280Air Canada

Thu, Sep 17 - Sat, Sep 19

6:00 am - 8:25 pmPWM Portland-LGW London Gatwick

33h 25m3 stops New York John F Kennedy Intl Lisbon Humberto Delgado Porto

9:20 pm - 11:54 pmLGW London Gatwick-PWM Portland

31h 34m3 stops Porto Lisbon Humberto Delgado New York John F Kennedy Intl

$1,337Multiple Airlines

Tue, Sep 15 - Thu, Sep 17

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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 10

PWM6:00 amPortland

19h 25m

1 stop

LHR6:25 amLondon Heathrow

Nov 24

LHR8:55 amLondon Heathrow

20h 24m

2 stops

PWM12:19 amPortland

$739

Delta

Oct 7

PWM4:47 pmPortland

14h 18m

2 stops

LHR12:05 pmLondon Heathrow

Oct 14

LHR6:30 amLondon Heathrow

22h 40m

2 stops

PWM12:10 amPortland

$743

Delta

Oct 7

PWM4:47 pmPortland

14h 18m

2 stops

LHR12:05 pmLondon Heathrow

Oct 14

LHR8:55 amLondon Heathrow

20h 15m

2 stops

PWM12:10 amPortland

$744

KLM flights from Portland, Maine to United Kingdom

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

KLM

Nov 5

PWM2:09 pmPortland

16h 31m

1 stop

LHR11:40 amLondon Heathrow

Nov 10

LHR11:45 amLondon Heathrow

17h 34m

2 stops

PWM12:19 amPortland

$790

KLM

Oct 3

PWM2:04 pmPortland

16h 46m

1 stop

EDI11:50 amEdinburgh Turnhouse

Oct 11

EDI11:10 amEdinburgh Turnhouse

18h 00m

2 stops

PWM12:10 amPortland

$853

KLM

Jan 15

PWM2:35 pmPortland

14h 55m

1 stop

LHR10:30 amLondon Heathrow

Mar 13

LHR9:05 amLondon Heathrow

19h 44m

1 stop

PWM11:49 pmPortland

$855

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

Tue 11/10

12:45 pm-6:50 am

1 stop13h 05m

London Heathrow

Tue 11/17

6:30 am-12:19 am

2 stops22h 49m

$739

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 10/5

4:20 pm-8:50 am

1 stop11h 30m

London Heathrow

Tue 10/20

11:45 am-12:10 am

2 stops17h 25m

$739

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 11/4

4:15 pm-10:30 am

1 stop13h 15m

London Heathrow

Thu 11/12

11:45 am-12:19 am

2 stops17h 34m

$740

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

$745

Quickest round-trip

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 11/4

4:15 pm-8:05 am

1 stop10h 50m

London Heathrow

Tue 11/10

4:35 pm-12:19 am

1 stop12h 44m

$746

PortlandEdinburgh

PWM Portland - EDI Edinburgh Turnhouse

PWMEDI

Portland

Thu 11/12

4:03 pm-9:40 am

1 stop12h 37m

Edinburgh Turnhouse

Mon 11/16

11:35 am-12:19 am

1 stop17h 44m

$822

PortlandEdinburgh

PWM Portland - EDI Edinburgh Turnhouse

PWMEDI

Portland

Thu 11/12

5:50 am-7:55 am

1 stop21h 05m

Edinburgh Turnhouse

Mon 11/16

9:25 am-11:21 pm

1 stop18h 56m

$862

PortlandGlasgow

PWM Portland - GLA Glasgow Intl

PWMGLA

Portland

Sun 10/25

5:45 pm-2:35 pm

2 stops16h 50m

Glasgow Intl

Sun 11/1

9:05 am-10:57 pm

2 stops18h 52m

$912

PortlandEdinburgh

PWM Portland - EDI Edinburgh Turnhouse

PWMEDI

Portland

Thu 11/12

11:07 am-9:05 am

1 stop16h 58m

Edinburgh Turnhouse

Tue 11/17

11:05 am-10:57 pm

1 stop16h 52m

$932

PortlandGlasgow

PWM Portland - GLA Glasgow Intl

PWMGLA

Portland

Fri 10/30

5:37 pm-3:15 pm

2 stops17h 38m

Glasgow Intl

Fri 11/6

8:00 am-11:54 pm

2 stops20h 54m

$942

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 December is also cheap. Prices for this month can be found on momondo for an average of $699.

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	$320
Fastest flight time	12h 00m
Direct flights	None

The best one-way flight to United Kingdom from Portland, Maine in the past 72 hours is $320. The best round-trip flight deal from Portland, Maine to United Kingdom found on momondo in the last 72 hours is $739.

The fastest flight from Portland, Maine to United Kingdom takes 12h 00m

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 September 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 7.1 12,051 reviews	Search American Airlines flights
United Airlines	PriceFrom $947	Free Cancellation	Rating 7.4 10,214 reviews	Search United Airlines flights
KLM	PriceFrom $1,112	Free Cancellation	Rating 7.8 1,579 reviews	Search KLM flights
Delta	PriceFrom $1,112	Free Cancellation	Rating 7.8 8,565 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.