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

JetBlue, Delta, and Air Canada are the most popular carriers operating from Portland to United Kingdom

What airlines fly to United Kingdom?

British Airways, Delta and JetBlue 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 46% of people opting to fly with this airline when traveling to United Kingdom. Keep in mind that there are 19 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 March 2026, there are 3 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.

$379 Cheap Flights from Portland to the United Kingdom in 2026

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

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:15 am - 8:40 am

PWM

LHR

18h 25m

2 stops

2:10 pm - 11:59 pm

LHR

PWM

14h 49m

2 stops

$706United Airlines

Tue, Aug 11 - Wed, Aug 12

6:00 am - 8:45 pm

PWM

LHR

9h 45m

1 stop

11:55 am - 11:36 pm

LHR

PWM

16h 41m

1 stop

$738JetBlue

Wed, May 6 - Mon, May 11

6:00 am - 8:45 pm

PWM

LHR

9h 45m

1 stop

11:55 am - 11:36 pm

LHR

PWM

16h 41m

1 stop

$739JetBlue

Wed, May 13 - Tue, May 19

6:30 am - 6:45 am

PWM

LHR

19h 15m

1 stop

8:40 am - 11:59 pm

LHR

PWM

20h 19m

2 stops

$768Delta

Tue, Sep 1 - Fri, Sep 4

12:50 pm - 9:15 am

PWM

LHR

15h 25m

2 stops

9:55 am - 11:59 pm

LHR

PWM

19h 04m

2 stops

$772Delta

Tue, Sep 1 - Thu, Sep 3

7:23 pm - 4:30 pm

PWM

EDI

16h 07m

2 stops

10:30 am - 10:13 pm

EDI

PWM

16h 43m

2 stops

$775American Airlines

Tue, Apr 21 - Tue, Apr 28

2:51 pm - 7:05 am

PWM

EDI

11h 14m

1 stop

2:05 pm - 12:46 am

EDI

PWM

15h 41m

1 stop

$778KLM

Tue, Apr 21 - Tue, Apr 28

3:02 pm - 11:55 am

PWM

EDI

15h 53m

2 stops

10:25 am - 11:27 pm

EDI

PWM

18h 02m

2 stops

$783Multiple Airlines

Wed, Apr 8 - Wed, Apr 15

3:02 pm - 1:25 pm

PWM

GLA

17h 23m

2 stops

5:50 am - 5:31 pm

GLA

PWM

16h 41m

2 stops

$828American Airlines

Mon, Apr 13 - Fri, Apr 24

5:16 pm - 1:10 pm

PWM

MAN

14h 54m

2 stops

8:35 am - 11:24 pm

MAN

PWM

19h 49m

2 stops

$844Multiple Airlines

Wed, Aug 26 - Tue, Sep 1

United Airlines flights from Portland, Maine to United Kingdom

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

United Airlines

Aug 11

PWM9:15 amPortland

18h 25m

2 stops

LHR8:40 amLondon Heathrow

Aug 12

LHR2:10 pmLondon Heathrow

14h 49m

2 stops

PWM11:59 pmPortland

$706

United Airlines

Aug 27

PWM6:00 amPortland

21h 25m

1 stop

EDI8:25 amEdinburgh Turnhouse

Sep 9

EDI12:30 pmEdinburgh Turnhouse

16h 29m

1 stop

PWM11:59 pmPortland

$772

United Airlines

Aug 27

PWM6:00 amPortland

21h 25m

1 stop

EDI8:25 amEdinburgh Turnhouse

Sep 9

EDI9:40 amEdinburgh Turnhouse

19h 19m

2 stops

PWM11:59 pmPortland

$777

Delta flights from Portland, Maine to United Kingdom

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

Delta

Sep 1

PWM6:30 amPortland

19h 15m

1 stop

LHR6:45 amLondon Heathrow

Sep 4

LHR8:40 amLondon Heathrow

20h 19m

2 stops

PWM11:59 pmPortland

$768

Delta

Sep 1

PWM12:50 pmPortland

15h 25m

2 stops

LHR9:15 amLondon Heathrow

Sep 3

LHR9:55 amLondon Heathrow

19h 04m

2 stops

PWM11:59 pmPortland

$772

Delta

Sep 1

PWM12:50 pmPortland

15h 25m

2 stops

LHR9:15 amLondon Heathrow

Sep 4

LHR8:40 amLondon Heathrow

20h 19m

2 stops

PWM11:59 pmPortland

$773

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 - LHR

PWMLHR

Portland

Tue 8/11

9:15 am-8:40 am

2 stops18h 25m

London Heathrow

Wed 8/12

2:10 pm-11:59 pm

2 stops14h 49m

$706

Quickest round-trip

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/6

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Mon 5/11

11:55 am-11:36 pm

1 stop16h 41m

$738

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/13

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Tue 5/19

11:55 am-11:36 pm

1 stop16h 41m

$739

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 9/1

6:30 am-6:45 am

1 stop19h 15m

London Heathrow

Fri 9/4

8:40 am-11:59 pm

2 stops20h 19m

$768

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 9/1

12:50 pm-9:15 am

2 stops15h 25m

London Heathrow

Thu 9/3

9:55 am-11:59 pm

2 stops19h 04m

$772

PortlandEdinburgh

PWM - EDI

PWMEDI

Portland

Tue 4/21

7:23 pm-4:30 pm

2 stops16h 07m

Edinburgh Turnhouse

Tue 4/28

10:30 am-10:13 pm

2 stops16h 43m

$775

PortlandEdinburgh

PWM - EDI

PWMEDI

Portland

Tue 4/21

2:51 pm-7:05 am

1 stop11h 14m

Edinburgh Turnhouse

Tue 4/28

2:05 pm-12:46 am

1 stop15h 41m

$778

PortlandEdinburgh

PWM - EDI

PWMEDI

Portland

Wed 4/8

3:02 pm-11:55 am

2 stops15h 53m

Edinburgh Turnhouse

Wed 4/15

10:25 am-11:27 pm

2 stops18h 02m

$783

PortlandGlasgow

PWM - GLA

PWMGLA

Portland

Mon 4/13

3:02 pm-1:25 pm

2 stops17h 23m

Glasgow Intl

Fri 4/24

5:50 am-5:31 pm

2 stops16h 41m

$828

PortlandManchester

PWM - MAN

PWMMAN

Portland

Wed 8/26

5:16 pm-1:10 pm

2 stops14h 54m

Manchester

Tue 9/1

8:35 am-11:24 pm

2 stops19h 49m

$844

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

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

You could potentially save up to 21% 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

Fastest flight time	9h 45m
Direct flights	None

The fastest flight from Portland, Maine to United Kingdom takes 9h 45m

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?
As of March 2026, there are 3 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
United Airlines	PriceFrom $648	Free Cancellation	Rating 7.4 9,418 reviews	Search United Airlines flights
American Airlines	PriceFrom $666	Free Cancellation	Rating 7.1 11,435 reviews	Search American Airlines flights
Delta	PriceFrom $683	Free Cancellation	Rating 7.9 8,286 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.