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

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

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 38% of people opting to fly with this airline when traveling to London. Keep in mind that there are 20 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 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 August 2025, there are 3 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.

$399 Cheap Flights from Allentown to London (ABE-LON) in 2025

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Find the cheapest flights from Allentown to London (ABE-LON)

Round-trip

One-way

Last minute

Cheap round-trip flights

6:00 am - 6:45 amABE-LHR

19h 45m1 stop

9:20 am - 5:34 pmLHR-ABE

13h 14m1 stop

$528Delta

Find Deal

Sun, Aug 17 - Thu, Aug 28

6:00 am - 6:45 amABE-LHR

19h 45m1 stop

8:20 am - 10:39 pmLHR-ABE

19h 19m2 stops

$533Delta

Find Deal

Sun, Aug 17 - Tue, Aug 26

6:00 am - 6:45 amABE-LHR

19h 45m1 stop

1:05 pm - 10:39 pmLHR-ABE

14h 34m1 stop

$578Delta

Find Deal

Sun, Aug 17 - Mon, Aug 25

6:00 am - 6:45 amABE-LHR

19h 45m1 stop

5:25 pm - 10:39 pmLHR-ABE

34h 14m1 stop

$584Delta

Find Deal

Sun, Aug 17 - Sun, Aug 24

1:00 pm - 8:20 amABE-LHR

14h 20m1 stop

2:05 pm - 11:58 amLHR-ABE

26h 53m2 stops

$625United Airlines

Find Deal

Sun, Sep 14 - Tue, Sep 23

1:00 pm - 6:20 amABE-LHR

12h 20m1 stop

8:30 am - 4:53 pmLHR-ABE

13h 23m1 stop

$648United Airlines

Find Deal

Wed, Sep 10 - Thu, Sep 25

1:00 pm - 9:00 amABE-LHR

15h 00m1 stop

8:55 am - 11:14 pmLHR-ABE

19h 19m1 stop

$678KLM

Find Deal

Mon, Dec 15 - Tue, Dec 23

1:00 pm - 10:40 amABE-LHR

16h 40m2 stops

6:50 am - 4:53 pmLHR-ABE

15h 03m2 stops

$738

Find Deal

Sat, Sep 20 - Sat, Sep 27

6:00 am - 7:50 amABE-LHR

20h 50m1 stop

8:55 am - 11:14 pmLHR-ABE

19h 19m1 stop

$1,093KLM

Find Deal

Fri, Dec 26 - Fri, Jan 2

1:00 pm - 1:45 pmABE-LCY

19h 45m3 stops

9:20 am - 9:54 pmLCY-ABE

41h 34m2 stops

$1,259

Find Deal

Sat, Sep 20 - Sat, Sep 27

KLM flights from Allentown to London

Our best KLM deals on Allentown to London flight tickets

KLM

Aug 13

ABE12:56 pmAllentown-Bethlehem

19h 34m

1 stop

LHR1:30 pmLondon Heathrow

Aug 23

LHR9:20 amLondon Heathrow

18h 07m

1 stop

ABE10:27 pmAllentown-Bethlehem

$577

Find similar

KLM

Dec 15

ABE1:00 pmAllentown-Bethlehem

15h 00m

1 stop

LHR9:00 amLondon Heathrow

Dec 23

LHR8:55 amLondon Heathrow

19h 19m

1 stop

ABE11:14 pmAllentown-Bethlehem

$678

Find similar

KLM

Aug 8

ABE12:55 pmAllentown-Bethlehem

19h 35m

1 stop

LHR1:30 pmLondon Heathrow

Aug 28

LHR6:30 amLondon Heathrow

16h 04m

2 stops

ABE5:34 pmAllentown-Bethlehem

$1,004

Find similar

Delta flights from Allentown to London

Our best Delta deals on Allentown to London flight tickets

Delta

Aug 17

ABE6:00 amAllentown-Bethlehem

19h 45m

1 stop

LHR6:45 amLondon Heathrow

Aug 28

LHR9:20 amLondon Heathrow

13h 14m

1 stop

ABE5:34 pmAllentown-Bethlehem

$528

Find similar

Delta

Aug 17

ABE6:00 amAllentown-Bethlehem

19h 45m

1 stop

LHR6:45 amLondon Heathrow

Aug 26

LHR8:20 amLondon Heathrow

19h 19m

2 stops

ABE10:39 pmAllentown-Bethlehem

$533

Find similar

Delta

Aug 16

ABE6:14 pmAllentown-Bethlehem

31h 31m

1 stop

LHR6:45 amLondon Heathrow

Aug 26

LHR8:20 amLondon Heathrow

19h 19m

2 stops

ABE10:39 pmAllentown-Bethlehem

$538

Find similar

Fly from

Fly to

Route

Depart

Return

Price

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 8/17

6:00 am-6:45 am

1 stop19h 45m

London Heathrow

Thu 8/28

9:20 am-5:34 pm

1 stop13h 14m

$528

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 8/17

6:00 am-6:45 am

1 stop19h 45m

London Heathrow

Tue 8/26

8:20 am-10:39 pm

2 stops19h 19m

$533

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 8/17

6:00 am-6:45 am

1 stop19h 45m

London Heathrow

Mon 8/25

1:05 pm-10:39 pm

1 stop14h 34m

$578

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 8/17

6:00 am-6:45 am

1 stop19h 45m

London Heathrow

Sun 8/24

5:25 pm-10:39 pm

1 stop34h 14m

$584

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 9/14

1:00 pm-8:20 am

1 stop14h 20m

London Heathrow

Tue 9/23

2:05 pm-11:58 am

2 stops26h 53m

$625

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 9/10

1:00 pm-6:20 am

1 stop12h 20m

London Heathrow

Thu 9/25

8:30 am-4:53 pm

1 stop13h 23m

$648

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Mon 12/15

1:00 pm-9:00 am

1 stop15h 00m

London Heathrow

Tue 12/23

8:55 am-11:14 pm

1 stop19h 19m

$678

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sat 9/20

1:00 pm-10:40 am

2 stops16h 40m

London Heathrow

Sat 9/27

6:50 am-4:53 pm

2 stops15h 03m

$738

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Fri 12/26

6:00 am-7:50 am

1 stop20h 50m

London Heathrow

Fri 1/2

8:55 am-11:14 pm

1 stop19h 19m

$1,093

AllentownLondon

ABE - LCY

ABELCY

Allentown-Bethlehem

Sat 9/20

1:00 pm-1:45 pm

3 stops19h 45m

London City

Sat 9/27

9:20 am-9:54 pm

2 stops41h 34m

$1,259

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 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

Best Price Found	$399
Fastest flight time	11h 55m
Direct flights	None
Airports in London	3 airports

The best one-way flight to London from Allentown in the past 72 hours is $399. The best round-trip flight deal from Allentown to London found on momondo in the last 72 hours is $528.

The fastest flight from Allentown to London takes 11h 55m

There are no direct flights from Allentown to London. Popular non-direct routes for this connection are Allentown-Bethlehem Airport - London City Airport, Allentown-Bethlehem Airport - London Gatwick Airport and Allentown-Bethlehem Airport - London Heathrow Airport.

There are 3 airports near London: London City (LCY), London Heathrow (LHR), London Gatwick (LGW)

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 11h 55m.
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 August 2025, there are 3 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.
What is the most popular airline from Allentown to London?
Based on momondo bookings for flights between Allentown and London, the leading airline is United Airlines, making up 100% of the total bookings.

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
United Airlines	PriceFrom $575	Free Cancellation	Rating 7.4 8,917 reviews	Search United Airlines flights
Delta	PriceFrom $581	Free Cancellation	Rating 8.0 7,985 reviews	Search Delta flights
American Airlines	PriceFrom $588	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights

Gatwick

Hounslow

Dover

Slough

Luton

Guildford

Milton Keynes

Dartford

Crawley

Hayes

Chelmsford

Stansted

Ilford

Brentwood

Colchester

Folkestone

Watford

Canterbury

Richmond

Wembley

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.