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Cheap flights from Allentown to London from $518

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 6/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
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.
United Airlines Logo
2:25 pm - 8:30 am
ABE
-
LHR
13h 05m
1 stop
United Airlines Logo
6:55 am - 8:58 pm
LHR
-
ABE
19h 03m
2 stops
$877United Airlines
Wed, May 6 - Wed, May 13
United Airlines Logo
2:25 pm - 10:00 am
ABE
-
LHR
14h 35m
2 stops
United Airlines Logo
6:50 am - 5:00 pm
LHR
-
ABE
15h 10m
2 stops
$880United Airlines
Tue, May 5 - Tue, May 12
United Airlines Logo
10:35 am - 10:40 am
ABE
-
LHR
19h 05m
2 stops
United Airlines Logo
6:55 am - 8:58 pm
LHR
-
ABE
19h 03m
2 stops
$882United Airlines
Wed, May 6 - Wed, May 13
United Airlines Logo
2:25 pm - 8:30 am
ABE
-
LHR
13h 05m
1 stop
United Airlines Logo
11:05 am - 8:58 pm
LHR
-
ABE
14h 53m
1 stop
$906United Airlines
Wed, May 6 - Wed, May 13
United Airlines Logo
10:38 am - 7:15 am
ABE
-
LHR
15h 37m
2 stops
United Airlines Logo
7:30 am - 10:06 am
LHR
-
ABE
31h 36m
2 stops
$912United Airlines
Wed, Aug 5 - Fri, Aug 14
United Airlines Logo
5:36 pm - 6:45 am
ABE
-
LHR
32h 09m
1 stop
United Airlines Logo
6:50 am - 4:56 pm
LHR
-
ABE
15h 06m
2 stops
$920United Airlines
Sat, Aug 29 - Fri, Sep 4
United Airlines Logo
6:15 am - 5:55 am
ABE
-
LHR
18h 40m
2 stops
United Airlines Logo
8:00 am - 9:12 pm
LHR
-
ABE
18h 12m
1 stop
$923United Airlines
Wed, Aug 5 - Fri, Aug 14
United Airlines Logo
6:15 am - 6:45 am
ABE
-
LHR
19h 30m
1 stop
United Airlines Logo
6:50 am - 5:03 pm
LHR
-
ABE
15h 13m
2 stops
$926United Airlines
Wed, Apr 15 - Wed, Apr 22
United Airlines Logo
6:15 am - 5:55 am
ABE
-
LHR
18h 40m
2 stops
United Airlines Logo
6:50 am - 5:03 pm
LHR
-
ABE
15h 13m
2 stops
$931United Airlines
Wed, Apr 15 - Wed, Apr 22
United Airlines Logo
5:40 pm - 11:55 am
ABE
-
LHR
13h 15m
1 stop
United Airlines Logo
6:55 am - 1:48 pm
LHR
-
ABE
35h 53m
2 stops
$933United Airlines
Sun, May 10 - Wed, May 20

United Airlines flights from Allentown to London Heathrow Airport

Our best United Airlines deals on Allentown to London Heathrow Airport flight tickets
United Airlines
May 6
ABE2:25 pmAllentown-Bethlehem
13h 05m
1 stop
LHR8:30 amLondon Heathrow
May 13
LHR6:55 amLondon Heathrow
19h 03m
2 stops
ABE8:58 pmAllentown-Bethlehem
$877
United Airlines
May 5
ABE2:25 pmAllentown-Bethlehem
14h 35m
2 stops
LHR10:00 amLondon Heathrow
May 12
LHR6:50 amLondon Heathrow
15h 10m
2 stops
ABE5:00 pmAllentown-Bethlehem
$880
United Airlines
May 6
ABE10:35 amAllentown-Bethlehem
19h 05m
2 stops
LHR10:40 amLondon Heathrow
May 13
LHR6:55 amLondon Heathrow
19h 03m
2 stops
ABE8:58 pmAllentown-Bethlehem
$882

Delta flights from Allentown to London Heathrow Airport

Our best Delta deals on Allentown to London Heathrow Airport flight tickets
Delta
Apr 5
ABE6:32 amAllentown-Bethlehem
18h 53m
1 stop
LHR6:25 amLondon Heathrow
Apr 21
LHR8:40 amLondon Heathrow
19h 20m
2 stops
ABE11:00 pmAllentown-Bethlehem
$1,025
Delta
Mar 26
ABE6:32 amAllentown-Bethlehem
22h 13m
2 stops
LHR8:45 amLondon Heathrow
Apr 8
LHR9:55 amLondon Heathrow
17h 57m
2 stops
ABE10:52 pmAllentown-Bethlehem
$1,029
Delta
Apr 5
ABE6:32 amAllentown-Bethlehem
22h 18m
2 stops
LHR9:50 amLondon Heathrow
Apr 22
LHR6:30 amLondon Heathrow
21h 30m
2 stops
ABE11:00 pmAllentown-Bethlehem
$1,030

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 March 23, 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

Wed 5/6

2:25 pm-8:30 am

1 stop13h 05m

London Heathrow

Wed 5/13

6:55 am-8:58 pm

2 stops19h 03m

$877

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 5/5

2:25 pm-10:00 am

2 stops14h 35m

London Heathrow

Tue 5/12

6:50 am-5:00 pm

2 stops15h 10m

$880

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 5/6

10:35 am-10:40 am

2 stops19h 05m

London Heathrow

Wed 5/13

6:55 am-8:58 pm

2 stops19h 03m

$882
Quickest round-trip

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 5/6

2:25 pm-8:30 am

1 stop13h 05m

London Heathrow

Wed 5/13

11:05 am-8:58 pm

1 stop14h 53m

$906

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 8/5

10:38 am-7:15 am

2 stops15h 37m

London Heathrow

Fri 8/14

7:30 am-10:06 am

2 stops31h 36m

$912

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sat 8/29

5:36 pm-6:45 am

1 stop32h 09m

London Heathrow

Fri 9/4

6:50 am-4:56 pm

2 stops15h 06m

$920

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 8/5

6:15 am-5:55 am

2 stops18h 40m

London Heathrow

Fri 8/14

8:00 am-9:12 pm

1 stop18h 12m

$923

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 4/15

6:15 am-6:45 am

1 stop19h 30m

London Heathrow

Wed 4/22

6:50 am-5:03 pm

2 stops15h 13m

$926

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 4/15

6:15 am-5:55 am

2 stops18h 40m

London Heathrow

Wed 4/22

6:50 am-5:03 pm

2 stops15h 13m

$931

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 5/10

5:40 pm-11:55 am

1 stop13h 15m

London Heathrow

Wed 5/20

6:55 am-1:48 pm

2 stops35h 53m

$933

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 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 $638. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $699.

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 morning. momondo users have found flights departing from Allentown to London Heathrow Airport in the morning for as low as $611. 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 $686.

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

12h 22m

Direct flights

None
The fastest flight from Allentown to London Heathrow Airport takes 12h 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

  • 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 12h 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
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Slough
Crawley
Stratford-upon-Avon
Wembley
Hayes
Dartford
Croydon
Harrow
Watford
Brentwood
Guildford
Stansted
Cobham
Folkestone
Romford

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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