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Cheap flights from Allentown to London from $399

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 9/21. 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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0 bags

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

Cheap round-trip flights

Delta Logo
6:00 am - 6:45 amABE-LHR
19h 45m1 stop
Delta Logo
9:20 am - 5:34 pmLHR-ABE
13h 14m1 stop
$528Delta
Find Deal
Sun, Aug 17 - Thu, Aug 28
Delta Logo
6:00 am - 6:45 amABE-LHR
19h 45m1 stop
Delta Logo
8:20 am - 10:39 pmLHR-ABE
19h 19m2 stops
$533Delta
Find Deal
Sun, Aug 17 - Tue, Aug 26
Delta Logo
6:00 am - 6:45 amABE-LHR
19h 45m1 stop
Delta Logo
1:05 pm - 10:39 pmLHR-ABE
14h 34m1 stop
$578Delta
Find Deal
Sun, Aug 17 - Mon, Aug 25
Delta Logo
6:00 am - 6:45 amABE-LHR
19h 45m1 stop
Delta Logo
5:25 pm - 10:39 pmLHR-ABE
34h 14m1 stop
$584Delta
Find Deal
Sun, Aug 17 - Sun, Aug 24
United Airlines Logo
1:00 pm - 8:20 amABE-LHR
14h 20m1 stop
United Airlines Logo
2:05 pm - 11:58 amLHR-ABE
26h 53m2 stops
$625United Airlines
Find Deal
Sun, Sep 14 - Tue, Sep 23
Delta Logo
12:46 pm - 7:50 amABE-LHR
14h 04m1 stop
Delta Logo
12:30 pm - 10:52 pmLHR-ABE
15h 22m1 stop
$628Delta
Find Deal
Fri, Nov 7 - Mon, Nov 17
United Airlines Logo
1:00 pm - 6:20 amABE-LHR
12h 20m1 stop
United Airlines Logo
8:30 am - 4:53 pmLHR-ABE
13h 23m1 stop
$648United Airlines
Find Deal
Wed, Sep 10 - Thu, Sep 25
KLM Logo
1:00 pm - 9:00 amABE-LHR
15h 00m1 stop
KLM Logo
8:55 am - 11:14 pmLHR-ABE
19h 19m1 stop
$678KLM
Find Deal
Mon, Dec 15 - Tue, Dec 23
Logo
1:00 pm - 10:40 amABE-LHR
16h 40m2 stops
Logo
6:50 am - 4:53 pmLHR-ABE
15h 03m2 stops
$738
Find Deal
Sat, Sep 20 - Sat, Sep 27
KLM Logo
6:00 am - 7:50 amABE-LHR
20h 50m1 stop
KLM Logo
8:55 am - 11:14 pmLHR-ABE
19h 19m1 stop
$1,093KLM
Find Deal
Fri, Dec 26 - Fri, Jan 2

KLM flights from Allentown to London Heathrow Airport

Our best KLM deals on Allentown to London Heathrow Airport 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 Heathrow Airport

Our best Delta deals on Allentown to London Heathrow Airport 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

momondo Fare Finder

 
Customize your flight search to find flights from Allentown to London Heathrow Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 7, 2025.
Use the filters below to find and compare flights from Allentown to London Heathrow Airport that are best for you.

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

Fri 11/7

12:46 pm-7:50 am

1 stop14h 04m

London Heathrow

Mon 11/17

12:30 pm-10:52 pm

1 stop15h 22m

$628

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

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Allentown 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

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

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $691. The most expensive day to fly to London Heathrow Airport is Tuesday, with ticket prices averaging around $1,033.

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 at noon. momondo users have found flights departing from Allentown to London Heathrow Airport at noon for as low as $755. 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 morning are often more expensive with an average ticket price of $1,008.

When to book flights from Allentown to London Heathrow Airport

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

Cheap Allentown to London Heathrow Airport (ABE to LHR) flight deals and tips

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

Best Price Found

$399

Fastest flight time

11h 55m

Direct flights

None
The best one-way flight to London Heathrow Airport from Allentown in the past 72 hours is $399. The best round-trip flight deal from Allentown to London Heathrow Airport found on momondo in the last 72 hours is $528.
The fastest flight from Allentown to London Heathrow Airport takes 11h 55m
There are no direct flights from Allentown to London Heathrow Airport. Popular non-direct route for this connection is Allentown-Bethlehem Airport - London Heathrow Airport.
Search flight deals

  • How far is Allentown-Bethlehem to London Heathrow by plane?

    The distance between Allentown-Bethlehem and London Heathrow is about 3510.6 mi. 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 Heathrow Airport?

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

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

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

    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 Allentown-Bethlehem Airport to London Heathrow Airport.

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

    The travel and health documents required for your trip to London Heathrow Airport 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 Heathrow Airport. 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 Allentown to London Heathrow Airport?

Best airlines flying from Allentown to London Heathrow Airport

Compare and see reviews for airlines that fly from Allentown to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $575Free CancellationRating
7.4
8,917 reviews
Search United Airlines flights
DeltaPriceFrom $581Free CancellationRating
8.0
7,985 reviews
Search Delta flights
American AirlinesPriceFrom $588Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Dover
Slough
Luton
Guildford
Milton Keynes
Dartford
Crawley
Hayes
Chelmsford
Stansted
Salisbury
Ilford
Brentwood
Colchester
Stratford-upon-Avon
Folkestone
Swindon
Watford

Why use momondo?

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

Finding the right flight to London from Allentown is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

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

All flight searches from Allentown to London on momondo can be filtered to show those which offer flexible booking policies.

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

Once all potential Allentown 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 Allentown to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Allentown 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.

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