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

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

Which airlines fly to United Kingdom?

British Airways, Virgin Atlantic 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 38% of people opting to fly with this airline when travelling to United Kingdom. Keep in mind that there are 10 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 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 travel and health documents required for your trip to United Kingdom can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at United Kingdom. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

£218 Cheap Flights from Portland, Maine to the United Kingdom in 2026/27

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

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

15:41 - 11:15PWM Portland-LHR London Heathrow

14h 34m2 stops Newark Zurich

09:00 - 23:21LHR London Heathrow-PWM Portland

43h 21m2 stops Halifax Intl Newark

£576United Airlines

Mon, 16 Nov - Wed, 18 Nov

08:49 - 09:10PWM Portland-LHR London Heathrow

19h 21m1 stop Newark

06:50 - 23:21LHR London Heathrow-PWM Portland

21h 31m2 stops Brussels Bruxelles-National Newark

£577United Airlines

Mon, 16 Nov - Wed, 18 Nov

15:41 - 16:20PWM Portland-LHR London Heathrow

19h 39m2 stops Newark Zurich

09:00 - 23:21LHR London Heathrow-PWM Portland

43h 21m2 stops Halifax Intl Newark

£580United Airlines

Mon, 16 Nov - Wed, 18 Nov

08:49 - 09:10PWM Portland-LHR London Heathrow

19h 21m1 stop Newark

06:50 - 23:21LHR London Heathrow-PWM Portland

21h 31m2 stops Brussels Bruxelles-National Newark

£580United Airlines

Mon, 16 Nov - Wed, 18 Nov

05:35 - 07:10PWM Portland-LHR London Heathrow

20h 35m2 stops Newark Montreal Pierre Elliott Trudeau Intl

06:50 - 23:21LHR London Heathrow-PWM Portland

21h 31m2 stops Brussels Bruxelles-National Newark

£583United Airlines

Mon, 16 Nov - Wed, 18 Nov

09:46 - 07:10PWM Portland-LHR London Heathrow

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

06:00 - 23:21LHR London Heathrow-PWM Portland

22h 21m3 stops Zurich Toronto Pearson Intl Newark

£585Multiple Airlines

Tue, 10 Nov - Thu, 12 Nov

08:49 - 06:30PWM Portland-LHR London Heathrow

16h 41m3 stops Newark Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl

06:00 - 23:21LHR London Heathrow-PWM Portland

22h 21m3 stops Zurich Toronto Pearson Intl Newark

£591Air Canada

Tue, 10 Nov - Thu, 12 Nov

15:41 - 11:15PWM Portland-LHR London Heathrow

14h 34m2 stops Newark Zurich

09:10 - 19:02LHR London Heathrow-PWM Portland

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

£597United Airlines

Tue, 10 Nov - Thu, 12 Nov

06:30 - 21:40PWM Portland-LHR London Heathrow

10h 10m1 stop New York John F Kennedy Intl

12:20 - 23:43LHR London Heathrow-PWM Portland

16h 23m1 stop New York John F Kennedy Intl

£624JetBlue

Tue, 10 Nov - Thu, 12 Nov

06:30 - 21:40PWM Portland-LHR London Heathrow

10h 10m1 stop New York John F Kennedy Intl

12:20 - 23:43LHR London Heathrow-PWM Portland

16h 23m1 stop New York John F Kennedy Intl

£628JetBlue

Mon, 16 Nov - Wed, 18 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

11:55 - 07:05PWM Portland-LHR London Heathrow

14h 10m1 stop Minneapolis St Paul

06:30 - 21:00LHR London Heathrow-PWM Portland

19h 30m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

£945Multiple Airlines

Sun, 1 Nov - Thu, 5 Nov

11:55 - 10:30PWM Portland-LHR London Heathrow

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

06:30 - 21:00LHR London Heathrow-PWM Portland

19h 30m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

£951Delta

Sun, 1 Nov - Thu, 5 Nov

11:55 - 07:05PWM Portland-LHR London Heathrow

14h 10m1 stop Minneapolis St Paul

08:55 - 21:00LHR London Heathrow-PWM Portland

17h 05m1 stop Atlanta Hartsfield-Jackson

£967Multiple Airlines

Sun, 1 Nov - Thu, 5 Nov

06:00 - 20:35PWM Portland-LHR London Heathrow

10h 35m1 stop Newark

09:10 - 19:02LHR London Heathrow-PWM Portland

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

£7,121United Airlines

Sat, 31 Oct - Thu, 5 Nov

06:00 - 20:35PWM Portland-LHR London Heathrow

10h 35m1 stop Newark

09:10 - 18:49LHR London Heathrow-PWM Portland

14h 39m1 stop Newark

£7,587United Airlines

Sat, 31 Oct - Thu, 5 Nov

10:50 - 21:20PWM Portland-LHR London Heathrow

29h 30m1 stop Newark

12:00 - 18:49LHR London Heathrow-PWM Portland

11h 49m1 stop Newark

£8,320Austrian Airlines

Sun, 1 Nov - Thu, 5 Nov

08:47 - 05:55PWM Portland-LHR London Heathrow

16h 08m1 stop Chicago O'Hare Intl

09:10 - 19:02LHR London Heathrow-PWM Portland

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

£8,336United Airlines

Sun, 1 Nov - Thu, 5 Nov

11:55 - 09:15PWM Portland-LHR London Heathrow

17h 20m2 stops New York LaGuardia Shannon

07:50 - 22:57LHR London Heathrow-PWM Portland

20h 07m2 stops Dublin Philadelphia

£8,714American Airlines

Sat, 31 Oct - Thu, 5 Nov

10:20 - 12:20PWM Portland-LHR London Heathrow

21h 00m2 stops Washington, D.C. Reagan-National Dublin

09:50 - 22:57LHR London Heathrow-PWM Portland

18h 07m2 stops Dublin Philadelphia

£8,717American Airlines

Sun, 1 Nov - Thu, 5 Nov

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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

5 Nov

PWM12:42Portland

14h 03m

1 stop

LHR07:45London Heathrow

18 Nov

LHR08:40London Heathrow

19h 51m

2 stops

PWM23:31Portland

£658

Delta

29 Dec

PWM13:20Portland

12h 55m

1 stop

LHR07:15London Heathrow

12 Jan

LHR06:30London Heathrow

22h 25m

2 stops

PWM23:55Portland

£661

Delta

5 Nov

PWM16:15Portland

13h 15m

2 stops

LHR10:30London Heathrow

18 Nov

LHR08:40London Heathrow

19h 51m

2 stops

PWM23:31Portland

£662

United Airlines flights from Portland, Maine to United Kingdom

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

United Airlines

16 Nov

PWM15:41Portland

14h 34m

2 stops

LHR11:15London Heathrow

18 Nov

LHR09:00London Heathrow

43h 21m

2 stops

PWM23:21Portland

£576

United Airlines

16 Nov

PWM08:49Portland

19h 21m

1 stop

LHR09:10London Heathrow

18 Nov

LHR06:50London Heathrow

21h 31m

2 stops

PWM23:21Portland

£577

United Airlines

16 Nov

PWM15:41Portland

19h 39m

2 stops

LHR16:20London Heathrow

18 Nov

LHR09:00London Heathrow

43h 21m

2 stops

PWM23:21Portland

£580

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 return flight

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-11:15

2 stops14h 34m

London Heathrow

Wed 18/11

09:00-23:21

2 stops43h 21m

£576

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

08:49-09:10

1 stop19h 21m

London Heathrow

Wed 18/11

06:50-23:21

2 stops21h 31m

£577

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-16:20

2 stops19h 39m

London Heathrow

Wed 18/11

09:00-23:21

2 stops43h 21m

£580

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

08:49-09:10

1 stop19h 21m

London Heathrow

Wed 18/11

06:50-23:21

2 stops21h 31m

£580

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

05:35-07:10

2 stops20h 35m

London Heathrow

Wed 18/11

06:50-23:21

2 stops21h 31m

£583

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 10/11

09:46-07:10

2 stops16h 24m

London Heathrow

Thu 12/11

06:00-23:21

3 stops22h 21m

£585

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 10/11

08:49-06:30

3 stops16h 41m

London Heathrow

Thu 12/11

06:00-23:21

3 stops22h 21m

£591

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 10/11

15:41-11:15

2 stops14h 34m

London Heathrow

Thu 12/11

09:10-19:02

2 stops14h 52m

£597

Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 10/11

06:30-21:40

1 stop10h 10m

London Heathrow

Thu 12/11

12:20-23:43

1 stop16h 23m

£624

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

06:30-21:40

1 stop10h 10m

London Heathrow

Wed 18/11

12:20-23:43

1 stop16h 23m

£628

Flights are sorted by cheapest return 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?

The cheapest month to fly to United Kingdom from Portland, Maine is in January. Flight prices, which tend to average around £0, are often lower during this time because this is during the off-season. If you are unable to visit United Kingdom during the month of January, then departing from Portland, Maine during the month February is also very affordable. Most momondo users find prices during this month for around £565.

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

You could potentially save up to 36% 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	£218
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 £218. The best return flight deal from Portland, Maine to United Kingdom found on momondo in the last 72 hours is £576.

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 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 travel and health documents required for your trip to United Kingdom can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at United Kingdom. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Portland to United Kingdom . Millions of users trust and use momondo every year so you are in good hands.

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

Yes. All flights to United Kingdom from Portland on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search for Portland to United Kingdom flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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.