What airlines fly to London Heathrow Airport?

United Airlines, Delta and American Airlines are the top three most popular airlines that fly to London Heathrow Airport from Maine according to our data. United Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 3 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

How long does it take to fly to London Heathrow Airport?

On average, it takes 9h 45m to fly from Maine to London Heathrow Airport if you fly out of Portland (the most popular airport in Maine) and into London Heathrow Airport (the most popular airport in London Heathrow Airport). If you’re flying out of Bangor and into London Heathrow Airport, then the flight time is around 12h.

How many flights depart from Maine to London Heathrow Airport on average per week?

The number of flights available between Maine and London Heathrow Airport is 230 per week as of December 2025. The most frequent departure day is Sun, with 17% of weekly flights leaving on this day.

What is the cheapest airline that flies from Maine to London Heathrow?

Austrian Airlines, American Airlines, and KLM are the most popular carriers operating from Maine to London Heathrow

When did momondo last update prices for flights from Maine to London Heathrow Airport?

Prices for flights from Maine to London Heathrow Airport are updated daily.

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

There are 17 operators available for flights from Maine to London Heathrow Airport as of December 2025.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Maine to London Heathrow Airport.

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

The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$194 Cheap Flights from Maine to London Heathrow Airport in 2025/26

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Cheap round-trip flights

Enter your travel dates to find the best prices.

8:00 pm - 7:50 am

BOS

LHR

6h 50mnonstop

1:05 pm - 4:00 pm

LHR

BOS

7h 55mnonstop

$503Virgin Atlantic

Sat, Jan 17 - Fri, Jan 23

7:12 pm - 6:55 am

BOS

LHR

6h 43mnonstop

9:20 am - 1:16 pm

LHR

BOS

7h 56mnonstop

$504JetBlue

Fri, Jan 23 - Mon, Mar 9

7:12 pm - 6:55 am

BOS

LHR

6h 43mnonstop

9:20 am - 12:16 pm

LHR

BOS

7h 56mnonstop

$505JetBlue

Mon, Jan 12 - Tue, Jan 20

7:15 pm - 7:00 am

BOS

LHR

6h 45mnonstop

7:40 pm - 3:15 pm

LHR

BOS

24h 35m1 stop

$506Iberia

Mon, Jan 12 - Tue, Jan 20

7:25 pm - 8:05 am

BOS

LHR

8h 40m1 stop

9:50 am - 3:30 pm

LHR

BOS

10h 40m1 stop

$507Aer Lingus

Sat, Mar 28 - Sat, Apr 4

7:34 pm - 10:40 am

BOS

LHR

10h 06m1 stop

1:45 pm - 7:55 pm

LHR

BOS

11h 10m1 stop

$508Multiple Airlines

Sun, Apr 26 - Wed, May 13

10:15 am - 6:30 am

BOS

LHR

15h 15m2 stops

6:50 am - 2:52 pm

LHR

BOS

13h 02m2 stops

$509Air Canada

Mon, Jan 12 - Tue, Jan 20

7:25 pm - 9:15 am

BOS

LHR

8h 50m1 stop

9:50 am - 3:30 pm

LHR

BOS

10h 40m1 stop

$512Aer Lingus

Thu, Jan 15 - Mon, May 11

1:07 pm - 7:55 am

BGR

LHR

13h 48m2 stops

5:50 pm - 3:54 pm

LHR

BGR

27h 04m2 stops

$634Multiple Airlines

Tue, Jan 27 - Tue, Feb 3

6:00 am - 7:10 am

PWM

LHR

20h 10m2 stops

1:25 pm - 11:30 pm

LHR

PWM

39h 05m2 stops

$640Air Canada

Wed, Jan 21 - Sun, Jan 25

United Airlines flights from Maine to London Heathrow Airport

Our best United Airlines deals on Maine to London Heathrow Airport flight tickets

United Airlines

Feb 13

BOS6:40 pmBoston Logan Intl

20h 55m

1 stop

LHR8:35 pmLondon Heathrow

Feb 17

LHR12:05 pmLondon Heathrow

13h 15m

1 stop

BOS8:20 pmBoston Logan Intl

$515

Find similar

United Airlines

Mar 13

BOS3:35 pmBoston Logan Intl

11h 35m

1 stop

LHR7:10 amLondon Heathrow

Mar 18

LHR12:05 pmLondon Heathrow

13h 15m

1 stop

BOS9:20 pmBoston Logan Intl

$518

Find similar

United Airlines

Jan 12

BOS6:40 pmBoston Logan Intl

20h 55m

1 stop

LHR8:35 pmLondon Heathrow

Jan 19

LHR1:25 pmLondon Heathrow

29h 52m

2 stops

BOS2:17 pmBoston Logan Intl

$523

Find similar

Air Canada flights from Maine to London Heathrow Airport

Our best Air Canada deals on Maine to London Heathrow Airport flight tickets

Air Canada

Jan 12

BOS10:15 amBoston Logan Intl

15h 15m

2 stops

LHR6:30 amLondon Heathrow

Jan 20

LHR6:50 amLondon Heathrow

13h 02m

2 stops

BOS2:52 pmBoston Logan Intl

$509

Find similar

Air Canada

Dec 30

BOS6:40 pmBoston Logan Intl

20h 55m

1 stop

LHR8:35 pmLondon Heathrow

Jan 11

LHR9:00 amLondon Heathrow

13h 50m

1 stop

BOS5:50 pmBoston Logan Intl

$524

Find similar

Air Canada

Jan 11

BOS10:15 amBoston Logan Intl

18h 05m

2 stops

LHR9:20 amLondon Heathrow

Jan 18

LHR6:50 amLondon Heathrow

17h 52m

2 stops

BOS7:42 pmBoston Logan Intl

$529

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Maine to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonLondon

BOS - LHR

BOSLHR

Boston Logan Intl

Sat 1/17

8:00 pm-7:50 am

Nonstop6h 50m

London Heathrow

Fri 1/23

1:05 pm-4:00 pm

Nonstop7h 55m

$503

BostonLondon

BOS - LHR

BOSLHR

Boston Logan Intl

Fri 1/23

7:12 pm-6:55 am

Nonstop6h 43m

London Heathrow

Mon 3/9

9:20 am-1:16 pm

Nonstop7h 56m

$504

BostonLondon

BOS - LHR

BOSLHR

Boston Logan Intl

Mon 1/12

7:12 pm-6:55 am

Nonstop6h 43m

London Heathrow

Tue 1/20

9:20 am-12:16 pm

Nonstop7h 56m

$505

BostonLondon

BOS - LHR

BOSLHR

Boston Logan Intl

Mon 1/12

7:15 pm-7:00 am

Nonstop6h 45m

London Heathrow

Tue 1/20

7:40 pm-3:15 pm

1 stop24h 35m

$506

BostonLondon

BOS - LHR

BOSLHR

Boston Logan Intl

Sat 3/28

7:25 pm-8:05 am

1 stop8h 40m

London Heathrow

Sat 4/4

9:50 am-3:30 pm

1 stop10h 40m

$507

BostonLondon

BOS - LHR

BOSLHR

Boston Logan Intl

Sun 4/26

7:34 pm-10:40 am

1 stop10h 06m

London Heathrow

Wed 5/13

1:45 pm-7:55 pm

1 stop11h 10m

$508

BostonLondon

BOS - LHR

BOSLHR

Boston Logan Intl

Mon 1/12

10:15 am-6:30 am

2 stops15h 15m

London Heathrow

Tue 1/20

6:50 am-2:52 pm

2 stops13h 02m

$509

BostonLondon

BOS - LHR

BOSLHR

Boston Logan Intl

Thu 1/15

7:25 pm-9:15 am

1 stop8h 50m

London Heathrow

Mon 5/11

9:50 am-3:30 pm

1 stop10h 40m

$512

BangorLondon

BGR - LHR

BGRLHR

Bangor

Tue 1/27

1:07 pm-7:55 am

2 stops13h 48m

London Heathrow

Tue 2/3

5:50 pm-3:54 pm

2 stops27h 04m

$634

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/21

6:00 am-7:10 am

2 stops20h 10m

London Heathrow

Sun 1/25

1:25 pm-11:30 pm

2 stops39h 05m

$640

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 Maine to London Heathrow Airport

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

Other information

What is the cheapest month to fly to London Heathrow Airport?

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from Maine, with most prices found around $541. If you’re not able to fly to London Heathrow Airport in October, then January is your next best option. Flight prices from Maine to London Heathrow Airport during January average around $576.

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

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $659. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $722.

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

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Maine to London Heathrow Airport in the afternoon for as low as $638. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $699.

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from Maine when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $635 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Maine for as low as $593 on momondo.

Cheap Maine to London Heathrow Airport flight deals and tips

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

Fastest flight time	6h 30m
Direct flights	Every day

The fastest flight from Maine to London Heathrow Airport takes 6h 30m

Direct flights go from Maine to London Heathrow Airport every day.

Search flight deals

When did momondo last update prices for flights from Maine to London Heathrow Airport?
Prices for flights from Maine to London Heathrow Airport are updated daily.
How many operators does momondo search for flights from Maine to London Heathrow Airport?
There are 17 operators available for flights from Maine to London Heathrow Airport as of December 2025.
How old do you have to be to fly from Maine to London Heathrow Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Maine to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Maine to London Heathrow Airport

Compare and see reviews for airlines that fly from Maine to London Heathrow Airport with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $648	Free Cancellation	Rating 7.4 9,092 reviews	Search United Airlines flights
Delta	PriceFrom $765	Free Cancellation	Rating 7.9 8,008 reviews	Search Delta flights
American Airlines	PriceFrom $786	Free Cancellation	Rating 7.2 11,051 reviews	Search American Airlines flights

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Stratford-upon-Avon

Crawley

Brentwood

Salisbury

Wembley

Watford

Ilford

Cobham

Folkestone

Romford

Richmond

Why use momondo?

Why should I use momondo to find a flight deal from Maine 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 Maine to London for you.

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

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

How can momondo help me find flights from Maine to London?

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 London from Maine.

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

If you are not ready to book a flight from Maine to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Cheap flights from Maine to London from $194

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Maine to London departing on 1/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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United Airlines flights from Maine to London Heathrow Airport

Our best United Airlines deals on Maine to London Heathrow Airport flight tickets

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Our best Air Canada deals on Maine to London Heathrow Airport flight tickets

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Use the filters below to find and compare flights from Maine to London Heathrow Airport that are best for you.

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How to get the cheapest flight ticket from Maine to London Heathrow Airport

What is the cheapest month to fly to London Heathrow Airport?

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

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $659. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $722.

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

How far in advance should I book a flight to London Heathrow Airport?

What is the cheapest airline that flies from Maine to London Heathrow?

Austrian Airlines, American Airlines, and KLM are the most popular carriers operating from Maine to London Heathrow

What airlines fly to London Heathrow Airport?

How many flights depart from Maine to London Heathrow Airport on average per week?

The number of flights available between Maine and London Heathrow Airport is 230 per week as of December 2025. The most frequent departure day is Sun, with 17% of weekly flights leaving on this day.

How long does it take to fly to London Heathrow Airport?

Cheap Maine to London Heathrow Airport flight deals and tips

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

Fastest flight time

Direct flights

When did momondo last update prices for flights from Maine to London Heathrow Airport?

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

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

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

Best airlines flying from Maine to London Heathrow Airport

Compare and see reviews for airlines that fly from Maine to London Heathrow Airport with momondo

Traveling to a place near London?

Why use momondo?

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

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

How can momondo help me find flights from Maine to London?

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

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to London

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo