What airlines fly to London?

British Airways, Delta and Virgin Atlantic are the top three most popular airlines that fly to London from Portland, Maine according to our data. British Airways is the first choice among our users, with 49% of people opting to fly with this airline when traveling to London. Keep in mind that there are 19 different airlines that fly to London 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 London?

Prices for flights from Portland Airport to London refresh daily.

How many operators does momondo search for flights from Portland Airport to London?

There are 3 operators available for flights from Portland Airport to London as of August 2025.

How old do you have to be to fly from Portland Airport to London?

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 London.

What documentation or ID do you need to fly to London?

The travel and health documents required for your trip to London 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 London. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$577 Cheap Flights from Portland to London in 2025

Q: What is the typical price of a round-trip flight between Portland, Maine and London?

Prices are currently typical for flights on this route. Typical prices usually range from $660 to $942. The lowest price recently found on this route was $672.

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Find the cheapest flights from Portland, Maine to London

Round-trip

One-way

Last minute

Cheap round-trip flights

2:17 pm - 9:30 amPWM-LHR

14h 13m1 stop

8:15 am - 10:02 pmLHR-PWM

18h 47m1 stop

$672JetBlue

Find Deal

mar., sep. 30 - dom., oct. 5

2:17 pm - 9:30 amPWM-LHR

14h 13m1 stop

11:55 am - 1:22 pmLHR-PWM

30h 27m1 stop

$691JetBlue

Find Deal

vie., oct. 3 - vie., oct. 10

2:17 pm - 9:30 amPWM-LHR

14h 13m1 stop

8:15 am - 10:07 pmLHR-PWM

18h 52m1 stop

$701JetBlue

Find Deal

vie., sep. 12 - dom., sep. 21

10:39 am - 6:30 amPWM-LHR

14h 51m2 stops

1:30 pm - 11:03 pmLHR-PWM

14h 33m2 stops

$739United Airlines

Find Deal

mié., sep. 10 - mié., sep. 17

2:30 pm - 10:20 amPWM-LHR

14h 50m1 stop

10:05 am - 6:11 pmLHR-PWM

13h 06m1 stop

$751American Airlines

Find Deal

mié., sep. 10 - mié., sep. 17

8:00 am - 9:35 amPWM-LHR

20h 35m2 stops

2:05 pm - 1:53 pmLHR-PWM

28h 48m2 stops

$777Air Canada

Find Deal

mar., sep. 30 - dom., oct. 5

7:30 am - 6:30 amPWM-LHR

18h 00m2 stops

12:40 pm - 6:26 pmLHR-PWM

34h 46m2 stops

$778Air Canada

Find Deal

mar., sep. 9 - dom., sep. 21

2:14 pm - 6:55 amPWM-LHR

11h 41m1 stop

1:30 pm - 11:03 pmLHR-PWM

14h 33m2 stops

$780United Airlines

Find Deal

mié., sep. 17 - mié., sep. 24

1:35 pm - 1:30 pmPWM-LHR

18h 55m1 stop

6:15 am - 12:05 amLHR-PWM

22h 50m2 stops

$803Delta

Find Deal

vie., oct. 3 - vie., oct. 10

4:55 pm - 8:45 amPWM-LHR

10h 50m1 stop

4:35 pm - 11:51 pmLHR-PWM

12h 16m1 stop

$876Delta

Find Deal

mar., nov. 25 - dom., nov. 30

United Airlines flights from Portland, Maine to London

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

United Airlines

Sep 10

PWM10:39 amPortland

14h 51m

2 stops

LHR6:30 amLondon Heathrow

Sep 17

LHR1:30 pmLondon Heathrow

14h 33m

2 stops

PWM11:03 pmPortland

$739

Find similar

United Airlines

Sep 17

PWM2:14 pmPortland

11h 41m

1 stop

LHR6:55 amLondon Heathrow

Sep 24

LHR1:30 pmLondon Heathrow

14h 33m

2 stops

PWM11:03 pmPortland

$780

Find similar

United Airlines

Oct 3

PWM6:00 amPortland

9h 40m

1 stop

LHR8:40 pmLondon Heathrow

Oct 7

LHR8:45 amLondon Heathrow

20h 14m

2 stops

PWM11:59 pmPortland

$787

Find similar

Delta flights from Portland, Maine to London

Our best Delta deals on Portland, Maine to London flight tickets

Delta

Oct 3

PWM1:35 pmPortland

18h 55m

1 stop

LHR1:30 pmLondon Heathrow

Oct 10

LHR6:15 amLondon Heathrow

22h 50m

2 stops

PWM12:05 amPortland

$803

Find similar

Delta

Nov 25

PWM4:55 pmPortland

10h 50m

1 stop

LHR8:45 amLondon Heathrow

Nov 30

LHR4:35 pmLondon Heathrow

12h 16m

1 stop

PWM11:51 pmPortland

$876

Find similar

Delta

Nov 14

PWM2:35 pmPortland

13h 55m

2 stops

LCY9:30 amLondon City

Nov 18

LCY9:20 amLondon City

19h 31m

2 stops

PWM11:51 pmPortland

$887

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 9/30

2:17 pm-9:30 am

1 stop14h 13m

London Heathrow

dom. 10/5

8:15 am-10:02 pm

1 stop18h 47m

$672

PortlandLondon

PWM - LHR

PWMLHR

Portland

vie. 10/3

2:17 pm-9:30 am

1 stop14h 13m

London Heathrow

vie. 10/10

11:55 am-1:22 pm

1 stop30h 27m

$691

PortlandLondon

PWM - LHR

PWMLHR

Portland

vie. 9/12

2:17 pm-9:30 am

1 stop14h 13m

London Heathrow

dom. 9/21

8:15 am-10:07 pm

1 stop18h 52m

$701

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 9/10

10:39 am-6:30 am

2 stops14h 51m

London Heathrow

mié. 9/17

1:30 pm-11:03 pm

2 stops14h 33m

$739

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 9/10

2:30 pm-10:20 am

1 stop14h 50m

London Heathrow

mié. 9/17

10:05 am-6:11 pm

1 stop13h 06m

$751

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 9/30

8:00 am-9:35 am

2 stops20h 35m

London Heathrow

dom. 10/5

2:05 pm-1:53 pm

2 stops28h 48m

$777

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 9/9

7:30 am-6:30 am

2 stops18h 00m

London Heathrow

dom. 9/21

12:40 pm-6:26 pm

2 stops34h 46m

$778

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 9/17

2:14 pm-6:55 am

1 stop11h 41m

London Heathrow

mié. 9/24

1:30 pm-11:03 pm

2 stops14h 33m

$780

PortlandLondon

PWM - LHR

PWMLHR

Portland

vie. 10/3

1:35 pm-1:30 pm

1 stop18h 55m

London Heathrow

vie. 10/10

6:15 am-12:05 am

2 stops22h 50m

$803

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 11/25

4:55 pm-8:45 am

1 stop10h 50m

London Heathrow

dom. 11/30

4:35 pm-11:51 pm

1 stop12h 16m

$876

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from Portland, Maine to London

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 typical price of a round-trip flight between Portland, Maine and London?

What is the cheapest month to fly to London?

The cheapest month to fly to London from Portland, Maine is in October. Flight prices, which tend to average around $677, are often lower during this time because this is during the off-season. The month of November is another great option to travel to London, with average flight prices from Portland, Maine averaging around $729.

What is the cheapest day to depart on your flight to London?

The cheapest day to depart from Portland, Maine to London is on a Tuesday. Travelers who choose to depart for London on a Tuesday will often find tickets for as low as $788. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $936. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Portland, Maine at noon is the least expensive time of day to depart. momondo users have found prices as low as $827 when looking at flights departing at noon. Flights to London 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.

When to book flights from Portland, Maine to London

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to London according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Portland, Maine to London (PWM to LON) flight deals and tips

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

Direct flights	None

There are no direct flights from Portland, Maine to London. There are no popular flight routes from Portland, Maine to London.

Search flight deals

How far is Portland to London by plane?
London is 3183.1 mi away from Portland. Typically, this will take 9h 35m by plane in normal conditions.
When did momondo last update prices for flights from Portland Airport to London?
Prices for flights from Portland Airport to London refresh daily.
How many operators does momondo search for flights from Portland Airport to London?
There are 3 operators available for flights from Portland Airport to London as of August 2025.
How old do you have to be to fly from Portland Airport to London?
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 London.
What documentation or ID do you need to fly to London?
The travel and health documents required for your trip to London 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 London. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Portland, Maine to London?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Portland, Maine to London is Delta (30% of total bookings). The next most popular airlines are JetBlue (29%), United Airlines (28%), and American Airlines (12%).

Best airlines flying from Portland, Maine to London

Compare and see reviews for airlines that fly from Portland, Maine to London with momondo

Airline	Rating	Free Cancellation	Price
JetBlue	PriceFrom $586	Free Cancellation	Rating 7.2 2,916 reviews	Search JetBlue flights
United Airlines	PriceFrom $648	Free Cancellation	Rating 7.4 8,930 reviews	Search United Airlines flights
Delta	PriceFrom $825	Free Cancellation	Rating 7.9 7,981 reviews	Search Delta flights

Hounslow

Gatwick

Luton

Dover

Slough

Milton Keynes

Guildford

Dartford

Crawley

Hayes

Chelmsford

Stansted

Brentwood

Ilford

Folkestone

Colchester

Watford

Richmond

Canterbury

Croydon

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Portland to London for you.

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

Yes. All flights to London 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 London?

Once all potential Portland to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes. momondo can track prices for Portland to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.