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Cheap flights from Allentown to London from $352

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 10/10. 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

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
6:16 am - 6:25 am
ABE
-
LHR
19h 09m
1 stop
Delta Logo
6:30 am - 5:30 pm
LHR
-
ABE
16h 00m
2 stops
$869Delta
Fri, Aug 21 - Sat, Aug 29
Delta Logo
6:13 pm - 1:15 pm
ABE
-
LHR
14h 02m
1 stop
Delta Logo
6:30 am - 5:30 pm
LHR
-
ABE
16h 00m
2 stops
$870Delta
Wed, Aug 19 - Thu, Aug 27
Delta Logo
1:00 pm - 7:15 am
ABE
-
LHR
13h 15m
1 stop
Delta Logo
8:40 am - 12:04 pm
LHR
-
ABE
32h 24m
2 stops
$875Delta
Fri, Oct 2 - Mon, Oct 5
Delta Logo
6:30 am - 8:05 am
ABE
-
LHR
20h 35m
2 stops
Delta Logo
8:40 am - 12:04 pm
LHR
-
ABE
32h 24m
2 stops
$879Delta
Thu, Oct 1 - Mon, Oct 5
Delta Logo
5:40 pm - 7:15 am
ABE
-
LHR
32h 35m
1 stop
Delta Logo
8:40 am - 12:04 pm
LHR
-
ABE
32h 24m
2 stops
$880Delta
Thu, Oct 1 - Mon, Oct 5
United Airlines Logo
2:30 pm - 10:15 am
ABE
-
LHR
14h 45m
2 stops
United Airlines Logo
8:00 am - 4:56 pm
LHR
-
ABE
13h 56m
1 stop
$882United Airlines
Sat, Oct 10 - Mon, Oct 12
United Airlines Logo
2:30 pm - 10:15 am
ABE
-
LHR
14h 45m
2 stops
United Airlines Logo
8:00 am - 4:56 pm
LHR
-
ABE
13h 56m
1 stop
$883United Airlines
Sat, Oct 10 - Mon, Oct 12
United Airlines Logo
6:15 am - 6:45 am
ABE
-
LHR
19h 30m
1 stop
United Airlines Logo
6:50 am - 9:12 pm
LHR
-
ABE
18h 22m
2 stops
$890United Airlines
Tue, Oct 20 - Tue, Oct 27
United Airlines Logo
2:30 pm - 8:30 am
ABE
-
LHR
13h 00m
1 stop
United Airlines Logo
6:55 am - 9:12 pm
LHR
-
ABE
19h 17m
2 stops
$891United Airlines
Wed, Oct 7 - Tue, Oct 13
United Airlines Logo
10:38 am - 5:55 am
ABE
-
LHR
14h 17m
2 stops
United Airlines Logo
6:50 am - 9:12 pm
LHR
-
ABE
18h 22m
2 stops
$894United Airlines
Tue, Oct 20 - Tue, Oct 27

KLM flights from Allentown to London Heathrow Airport

Our best KLM deals on Allentown to London Heathrow Airport flight tickets
KLM
May 16
ABE6:27 amAllentown-Bethlehem
18h 58m
1 stop
LHR6:25 amLondon Heathrow
May 21
LHR8:40 amLondon Heathrow
18h 38m
2 stops
ABE10:18 pmAllentown-Bethlehem
$969
KLM
May 25
ABE6:15 pmAllentown-Bethlehem
14h 00m
1 stop
LHR1:15 pmLondon Heathrow
Jun 5
LHR6:30 amLondon Heathrow
15h 58m
2 stops
ABE5:28 pmAllentown-Bethlehem
$1,064
KLM
May 25
ABE6:15 pmAllentown-Bethlehem
14h 00m
1 stop
LHR1:15 pmLondon Heathrow
Jun 5
LHR1:25 pmLondon Heathrow
13h 53m
1 stop
ABE10:18 pmAllentown-Bethlehem
$1,093

Delta flights from Allentown to London Heathrow Airport

Our best Delta deals on Allentown to London Heathrow Airport flight tickets
Delta
Aug 21
ABE6:16 amAllentown-Bethlehem
19h 09m
1 stop
LHR6:25 amLondon Heathrow
Aug 29
LHR6:30 amLondon Heathrow
16h 00m
2 stops
ABE5:30 pmAllentown-Bethlehem
$869
Delta
Aug 19
ABE6:13 pmAllentown-Bethlehem
14h 02m
1 stop
LHR1:15 pmLondon Heathrow
Aug 27
LHR6:30 amLondon Heathrow
16h 00m
2 stops
ABE5:30 pmAllentown-Bethlehem
$870
Delta
Oct 2
ABE1:00 pmAllentown-Bethlehem
13h 15m
1 stop
LHR7:15 amLondon Heathrow
Oct 5
LHR8:40 amLondon Heathrow
32h 24m
2 stops
ABE12:04 pmAllentown-Bethlehem
$875

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 May 15, 2026.
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

Cheapest round-trip

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Fri 8/21

6:16 am-6:25 am

1 stop19h 09m

London Heathrow

Sat 8/29

6:30 am-5:30 pm

2 stops16h 00m

$869

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 8/19

6:13 pm-1:15 pm

1 stop14h 02m

London Heathrow

Thu 8/27

6:30 am-5:30 pm

2 stops16h 00m

$870

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Fri 10/2

1:00 pm-7:15 am

1 stop13h 15m

London Heathrow

Mon 10/5

8:40 am-12:04 pm

2 stops32h 24m

$875

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Thu 10/1

6:30 am-8:05 am

2 stops20h 35m

London Heathrow

Mon 10/5

8:40 am-12:04 pm

2 stops32h 24m

$879

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Thu 10/1

5:40 pm-7:15 am

1 stop32h 35m

London Heathrow

Mon 10/5

8:40 am-12:04 pm

2 stops32h 24m

$880
Quickest round-trip

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sat 10/10

2:30 pm-10:15 am

2 stops14h 45m

London Heathrow

Mon 10/12

8:00 am-4:56 pm

1 stop13h 56m

$882

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sat 10/10

2:30 pm-10:15 am

2 stops14h 45m

London Heathrow

Mon 10/12

8:00 am-4:56 pm

1 stop13h 56m

$883

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 10/20

6:15 am-6:45 am

1 stop19h 30m

London Heathrow

Tue 10/27

6:50 am-9:12 pm

2 stops18h 22m

$890

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 10/7

2:30 pm-8:30 am

1 stop13h 00m

London Heathrow

Tue 10/13

6:55 am-9:12 pm

2 stops19h 17m

$891

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 10/20

10:38 am-5:55 am

2 stops14h 17m

London Heathrow

Tue 10/27

6:50 am-9:12 pm

2 stops18h 22m

$894

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 airline that flies from Allentown-Bethlehem to London Heathrow?

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

What airlines fly to London Heathrow Airport?

United Airlines, British Airways and American Airlines are the top three most popular airlines that fly to London Heathrow Airport from Allentown according to our data. United Airlines is the first choice among our users, with 49% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 17 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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

Fastest flight time

11h 22m

Direct flights

None
The fastest flight from Allentown to London Heathrow Airport takes 11h 22m
There are no direct flights from Allentown to London Heathrow Airport. There are no popular flight routes from Allentown to London Heathrow Airport.
Search flight deals

Frequently asked questions about flying from Allentown to London Heathrow Airport

  • 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 22m.

  • 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 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.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Milton Keynes
Dover
Luton
Hayes
Crawley
Stratford-upon-Avon
Wembley
Slough
Croydon
Stansted
Watford
Harrow
Brentwood
Dartford
Cobham
Folkestone
Romford
Uxbridge

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.

An easier way to manage your London Heathrow Airport trip

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