What airlines fly to London?

British Airways, United Airlines and Iberia are the top three most popular airlines that fly to London from Allentown according to our data. British Airways is the first choice among our users, with 40% of people opting to fly with this airline when traveling to London. Keep in mind that there are 18 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Allentown-Bethlehem to London?

Delta and United Airlines are the most popular carriers operating from Allentown-Bethlehem to London

When did momondo last update prices for flights from Allentown-Bethlehem Airport to London?

Prices for flights from Allentown-Bethlehem Airport to London are refreshed on a daily basis.

How many operators does momondo search for flights from Allentown-Bethlehem Airport to London?

As of December 2025, there are 2 operators available to choose from for flights from Allentown-Bethlehem Airport to London.

How old do you have to be to fly from Allentown-Bethlehem Airport to London?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Allentown-Bethlehem Airport to London.

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

The required travel and health documents for your London 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 London. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$379 Cheap Flights from Allentown to London in 2025/26

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12:48 pm - 7:50 am

ABE

LHR

14h 02m1 stop

6:20 am - 10:50 pm

LHR

ABE

21h 30m2 stops

$623Delta

Fri, Feb 6 - Tue, Feb 10

2:00 pm - 9:00 am

ABE

LHR

14h 00m1 stop

8:40 am - 10:10 pm

LHR

ABE

18h 30m2 stops

$628Delta

Sat, Jan 17 - Sat, Jan 24

5:59 pm - 11:40 am

ABE

LHR

12h 41m1 stop

8:55 am - 10:45 pm

LHR

ABE

18h 50m1 stop

$630KLM

Sun, Feb 1 - Sat, Feb 21

6:28 am - 9:05 am

ABE

LHR

21h 37m2 stops

6:30 am - 10:10 pm

LHR

ABE

20h 40m2 stops

$632Delta

Sat, Jan 17 - Sat, Jan 24

6:28 am - 8:45 am

ABE

LHR

21h 17m2 stops

10:45 am - 10:45 pm

LHR

ABE

17h 00m1 stop

$634Delta

Sun, Feb 1 - Sat, Feb 21

2:00 pm - 11:40 am

ABE

LHR

16h 40m1 stop

8:55 am - 5:14 pm

LHR

ABE

13h 19m1 stop

$655KLM

Sat, Jan 17 - Sat, Jan 24

5:07 pm - 11:15 am

ABE

LHR

13h 08m1 stop

6:00 pm - 10:41 am

LHR

ABE

45h 41m2 stops

$689United Airlines

Wed, Dec 31 - Wed, Jan 7

6:17 am - 6:40 am

ABE

LHR

19h 23m2 stops

6:00 pm - 10:41 am

LHR

ABE

45h 41m2 stops

$694United Airlines

Wed, Dec 31 - Wed, Jan 7

8:30 am - 8:35 pm

ABE

LGW

31h 05m3 stops

12:40 pm - 8:15 pm

LGW

ABE

36h 35m3 stops

$1,248Multiple Airlines

Sun, Feb 1 - Sat, Feb 21

8:30 am - 10:55 am

ABE

LGW

21h 25m2 stops

5:25 pm - 8:15 pm

LGW

ABE

31h 50m3 stops

$1,451Multiple Airlines

Sun, Feb 1 - Sat, Feb 21

Delta flights from Allentown to London

Our best Delta deals on Allentown to London flight tickets

Delta

Feb 6

ABE12:48 pmAllentown-Bethlehem

14h 02m

1 stop

LHR7:50 amLondon Heathrow

Feb 10

LHR6:20 amLondon Heathrow

21h 30m

2 stops

ABE10:50 pmAllentown-Bethlehem

$623

Find similar

Delta

Jan 17

ABE2:00 pmAllentown-Bethlehem

14h 00m

1 stop

LHR9:00 amLondon Heathrow

Jan 24

LHR8:40 amLondon Heathrow

18h 30m

2 stops

ABE10:10 pmAllentown-Bethlehem

$628

Find similar

Delta

Jan 17

ABE6:28 amAllentown-Bethlehem

21h 37m

2 stops

LHR9:05 amLondon Heathrow

Jan 24

LHR6:30 amLondon Heathrow

20h 40m

2 stops

ABE10:10 pmAllentown-Bethlehem

$632

Find similar

United Airlines flights from Allentown to London

Our best United Airlines deals on Allentown to London flight tickets

United Airlines

Dec 31

ABE5:07 pmAllentown-Bethlehem

13h 08m

1 stop

LHR11:15 amLondon Heathrow

Jan 7

LHR6:00 pmLondon Heathrow

45h 41m

2 stops

ABE10:41 amAllentown-Bethlehem

$689

Find similar

United Airlines

Dec 31

ABE6:17 amAllentown-Bethlehem

19h 23m

2 stops

LHR6:40 amLondon Heathrow

Jan 7

LHR6:00 pmLondon Heathrow

45h 41m

2 stops

ABE10:41 amAllentown-Bethlehem

$694

Find similar

United Airlines

Jan 16

ABE11:30 amAllentown-Bethlehem

18h 45m

1 stop

LHR11:15 amLondon Heathrow

Jan 23

LHR6:50 amLondon Heathrow

19h 15m

2 stops

ABE9:05 pmAllentown-Bethlehem

$709

Find similar

Fly from

Fly to

Route

Depart

Return

Price

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Fri 2/6

12:48 pm-7:50 am

1 stop14h 02m

London Heathrow

Tue 2/10

6:20 am-10:50 pm

2 stops21h 30m

$623

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sat 1/17

2:00 pm-9:00 am

1 stop14h 00m

London Heathrow

Sat 1/24

8:40 am-10:10 pm

2 stops18h 30m

$628

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 2/1

5:59 pm-11:40 am

1 stop12h 41m

London Heathrow

Sat 2/21

8:55 am-10:45 pm

1 stop18h 50m

$630

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sat 1/17

6:28 am-9:05 am

2 stops21h 37m

London Heathrow

Sat 1/24

6:30 am-10:10 pm

2 stops20h 40m

$632

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 2/1

6:28 am-8:45 am

2 stops21h 17m

London Heathrow

Sat 2/21

10:45 am-10:45 pm

1 stop17h 00m

$634

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sat 1/17

2:00 pm-11:40 am

1 stop16h 40m

London Heathrow

Sat 1/24

8:55 am-5:14 pm

1 stop13h 19m

$655

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 12/31

5:07 pm-11:15 am

1 stop13h 08m

London Heathrow

Wed 1/7

6:00 pm-10:41 am

2 stops45h 41m

$689

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 12/31

6:17 am-6:40 am

2 stops19h 23m

London Heathrow

Wed 1/7

6:00 pm-10:41 am

2 stops45h 41m

$694

AllentownLondon

ABE - LGW

ABELGW

Allentown-Bethlehem

Sun 2/1

8:30 am-8:35 pm

3 stops31h 05m

London Gatwick

Sat 2/21

12:40 pm-8:15 pm

3 stops36h 35m

$1,248

AllentownLondon

ABE - LGW

ABELGW

Allentown-Bethlehem

Sun 2/1

8:30 am-10:55 am

2 stops21h 25m

London Gatwick

Sat 2/21

5:25 pm-8:15 pm

3 stops31h 50m

$1,451

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 resultsSorted by cheapest first

How to get the cheapest flight ticket from Allentown 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 cheapest day to depart on your flight to London?

The cheapest day to depart from Allentown to London is on a Thursday. Travelers who choose to depart for London on a Thursday will often find tickets for as low as $774. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,504. 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 Allentown in the morning is the least expensive time of day to depart. momondo users have found prices as low as $817 when looking at flights departing in the morning. Flights to London are more costly in the evening, with an average ticket price of $1,154. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Allentown to London

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

Estimated round-trip price

Cheap Allentown to London (ABE to LON) flight deals and tips

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

Fastest flight time	12h 30m
Direct flights	None

The fastest flight from Allentown to London takes 12h 30m

There are no direct flights from Allentown to London. There are no popular flight routes from Allentown to London.

Search flight deals

How far is Allentown-Bethlehem to London by plane?
There are 3523.4 mi between Allentown-Bethlehem and London. In terms of flight time, this usually takes a little over 12h 41m.
When did momondo last update prices for flights from Allentown-Bethlehem Airport to London?
Prices for flights from Allentown-Bethlehem Airport to London are refreshed on a daily basis.
How many operators does momondo search for flights from Allentown-Bethlehem Airport to London?
As of December 2025, there are 2 operators available to choose from for flights from Allentown-Bethlehem Airport to London.
How old do you have to be to fly from Allentown-Bethlehem Airport to London?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Allentown-Bethlehem Airport to London.
What documentation or ID do you need to fly to London?
The required travel and health documents for your London 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 London. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Allentown to London

Compare and see reviews for airlines that fly from Allentown to London with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $581	Free Cancellation	Rating 7.9 8,011 reviews		Search Delta flights
United Airlines	PriceFrom $690	Free Cancellation	Rating 7.4 9,066 reviews		Search United Airlines flights

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Crawley

Brentwood

Wembley

Romford

Watford

Ilford

Cobham

Folkestone

Uxbridge

Stansted

Chelmsford

Why use momondo?

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

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

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

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

momondo helps you find the best flight between Allentown and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes momondo offers price alerts on flights to London from Allentown. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your London trip

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Find better results for your trip to the United Kingdom

Cheap flights from Allentown to London from $379

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Allentown to London departing on 1/21. 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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Delta flights from Allentown to London

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How to get the cheapest flight ticket from Allentown 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

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

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

What is the cheapest airline that flies from Allentown-Bethlehem to London?

Delta and United Airlines are the most popular carriers operating from Allentown-Bethlehem to London

What airlines fly to London?

When to book flights from Allentown to London

Cheap Allentown to London (ABE to LON) flight deals and tips

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

Fastest flight time

Direct flights

How far is Allentown-Bethlehem to London by plane?

When did momondo last update prices for flights from Allentown-Bethlehem Airport to London?

How many operators does momondo search for flights from Allentown-Bethlehem Airport to London?

How old do you have to be to fly from Allentown-Bethlehem Airport to London?

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

Best airlines flying from Allentown to London

Compare and see reviews for airlines that fly from Allentown to London with momondo

Traveling to a place near London?

Why use momondo?

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

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

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

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

An easier way to manage your London 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 the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London