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Cheap flights from Allentown to London from $330

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 2/1. 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
1 adult, Economy, 0 bags

Find the cheapest flights from Allentown to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
5:36 pm - 10:05 amABE  Allentown-Bethlehem-LHR London Heathrow
35h 29m2 stops Chicago O'Hare Intl Brussels Bruxelles-National
United Airlines Logo
7:40 am - 9:12 pmLHR  London Heathrow-ABE Allentown-Bethlehem
18h 32m1 stop Chicago O'Hare Intl
$767United Airlines
Sun, Dec 6 - Wed, Dec 9
United Airlines Logo
5:36 pm - 10:05 amABE  Allentown-Bethlehem-LHR London Heathrow
35h 29m2 stops Chicago O'Hare Intl Brussels Bruxelles-National
United Airlines Logo
9:10 am - 10:06 amLHR  London Heathrow-ABE Allentown-Bethlehem
29h 56m2 stops Newark Chicago O'Hare Intl
$771United Airlines
Sun, Dec 6 - Wed, Dec 9
United Airlines Logo
5:36 pm - 10:05 amABE  Allentown-Bethlehem-LHR London Heathrow
35h 29m2 stops Chicago O'Hare Intl Brussels Bruxelles-National
United Airlines Logo
6:35 am - 10:06 amLHR  London Heathrow-ABE Allentown-Bethlehem
32h 31m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
$829United Airlines
Sun, Dec 6 - Wed, Dec 9
United Airlines Logo
6:20 am - 8:35 amABE  Allentown-Bethlehem-LHR London Heathrow
21h 15m2 stops Chicago O'Hare Intl Ottawa
United Airlines Logo
6:50 am - 9:35 amLHR  London Heathrow-ABE Allentown-Bethlehem
31h 45m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
$866United Airlines
Wed, Oct 7 - Wed, Oct 14
United Airlines Logo
5:43 pm - 11:55 amABE  Allentown-Bethlehem-LHR London Heathrow
13h 12m1 stop Chicago O'Hare Intl
United Airlines Logo
8:00 am - 5:08 pmLHR  London Heathrow-ABE Allentown-Bethlehem
14h 08m1 stop Chicago O'Hare Intl
$895United Airlines
Tue, Sep 29 - Tue, Oct 6
Delta Logo
6:03 pm - 1:15 pmABE  Allentown-Bethlehem-LHR London Heathrow
14h 12m1 stop Atlanta Hartsfield-Jackson
Delta Logo
1:25 pm - 10:29 pmLHR  London Heathrow-ABE Allentown-Bethlehem
14h 04m1 stop Atlanta Hartsfield-Jackson
$896Delta
Wed, Oct 7 - Tue, Oct 13
United Airlines Logo
10:37 am - 7:55 amABE  Allentown-Bethlehem-LHR London Heathrow
16h 18m1 stop Chicago O'Hare Intl
United Airlines Logo
10:25 am - 9:12 pmLHR  London Heathrow-ABE Allentown-Bethlehem
15h 47m1 stop Chicago O'Hare Intl
$898United Airlines
Sun, Dec 6 - Wed, Dec 9
United Airlines Logo
10:37 am - 7:55 amABE  Allentown-Bethlehem-LHR London Heathrow
16h 18m1 stop Chicago O'Hare Intl
United Airlines Logo
10:25 am - 9:12 pmLHR  London Heathrow-ABE Allentown-Bethlehem
15h 47m1 stop Chicago O'Hare Intl
$899United Airlines
Sun, Dec 6 - Wed, Dec 9
United Airlines Logo
10:37 am - 6:55 amABE  Allentown-Bethlehem-LHR London Heathrow
15h 18m2 stops Chicago O'Hare Intl Washington, D.C. Dulles Intl
United Airlines Logo
7:25 am - 9:00 pmLHR  London Heathrow-ABE Allentown-Bethlehem
18h 35m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
$901United Airlines
Wed, Oct 7 - Tue, Oct 13
United Airlines Logo
6:20 am - 6:45 amABE  Allentown-Bethlehem-LHR London Heathrow
19h 25m1 stop Chicago O'Hare Intl
United Airlines Logo
6:50 am - 9:00 pmLHR  London Heathrow-ABE Allentown-Bethlehem
19h 10m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
$911United Airlines
Thu, Oct 8 - Wed, Oct 14

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Delta flights from Allentown to London Heathrow Airport

Our best Delta deals on Allentown to London Heathrow Airport flight tickets
Delta
Oct 7
ABE6:03 pmAllentown-Bethlehem
14h 12m
1 stop
LHR1:15 pmLondon Heathrow
Oct 13
LHR1:25 pmLondon Heathrow
14h 04m
1 stop
ABE10:29 pmAllentown-Bethlehem
$896
Delta
Sep 9
ABE6:08 pmAllentown-Bethlehem
14h 07m
1 stop
LHR1:15 pmLondon Heathrow
Sep 17
LHR9:20 amLondon Heathrow
12h 59m
1 stop
ABE5:19 pmAllentown-Bethlehem
$956
Delta
Dec 24
ABE1:00 pmAllentown-Bethlehem
13h 50m
1 stop
LHR7:50 amLondon Heathrow
Dec 30
LHR10:50 amLondon Heathrow
16h 56m
1 stop
ABE10:46 pmAllentown-Bethlehem
$988

United Airlines flights from Allentown to London Heathrow Airport

Our best United Airlines deals on Allentown to London Heathrow Airport flight tickets
United Airlines
Dec 6
ABE5:36 pmAllentown-Bethlehem
35h 29m
2 stops
LHR10:05 amLondon Heathrow
Dec 9
LHR7:40 amLondon Heathrow
18h 32m
1 stop
ABE9:12 pmAllentown-Bethlehem
$767
United Airlines
Dec 6
ABE5:36 pmAllentown-Bethlehem
35h 29m
2 stops
LHR10:05 amLondon Heathrow
Dec 9
LHR9:10 amLondon Heathrow
29h 56m
2 stops
ABE10:06 amAllentown-Bethlehem
$771
United Airlines
Dec 6
ABE5:36 pmAllentown-Bethlehem
35h 29m
2 stops
LHR10:05 amLondon Heathrow
Dec 9
LHR6:35 amLondon Heathrow
32h 31m
2 stops
ABE10:06 amAllentown-Bethlehem
$829

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 16, 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 Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Sun 12/6

5:36 pm-10:05 am

2 stops35h 29m

London Heathrow

Wed 12/9

7:40 am-9:12 pm

1 stop18h 32m

$767

AllentownLondon

ABE Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Sun 12/6

5:36 pm-10:05 am

2 stops35h 29m

London Heathrow

Wed 12/9

9:10 am-10:06 am

2 stops29h 56m

$771

AllentownLondon

ABE Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Sun 12/6

5:36 pm-10:05 am

2 stops35h 29m

London Heathrow

Wed 12/9

6:35 am-10:06 am

2 stops32h 31m

$829

AllentownLondon

ABE Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Wed 10/7

6:20 am-8:35 am

2 stops21h 15m

London Heathrow

Wed 10/14

6:50 am-9:35 am

2 stops31h 45m

$866
Quickest round-trip

AllentownLondon

ABE Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Tue 9/29

5:43 pm-11:55 am

1 stop13h 12m

London Heathrow

Tue 10/6

8:00 am-5:08 pm

1 stop14h 08m

$895

AllentownLondon

ABE Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Wed 10/7

6:03 pm-1:15 pm

1 stop14h 12m

London Heathrow

Tue 10/13

1:25 pm-10:29 pm

1 stop14h 04m

$896

AllentownLondon

ABE Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Sun 12/6

10:37 am-7:55 am

1 stop16h 18m

London Heathrow

Wed 12/9

10:25 am-9:12 pm

1 stop15h 47m

$898

AllentownLondon

ABE Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Sun 12/6

10:37 am-7:55 am

1 stop16h 18m

London Heathrow

Wed 12/9

10:25 am-9:12 pm

1 stop15h 47m

$899

AllentownLondon

ABE Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Wed 10/7

10:37 am-6:55 am

2 stops15h 18m

London Heathrow

Tue 10/13

7:25 am-9:00 pm

2 stops18h 35m

$901

AllentownLondon

ABE Allentown-Bethlehem - LHR London Heathrow

ABELHR

Allentown-Bethlehem

Thu 10/8

6:20 am-6:45 am

1 stop19h 25m

London Heathrow

Wed 10/14

6:50 am-9:00 pm

2 stops19h 10m

$911

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?

Delta, United Airlines, and KLM 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 54% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 16 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

15h 13m

Direct flights

None
The fastest flight from Allentown to London Heathrow Airport takes 15h 13m
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 15h 13m.

  • 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
Luton
Hayes
Stratford-upon-Avon
Wembley
Croydon
Dover
Stansted
Richmond
Kingston upon Thames
Harrow
Watford
Cobham
Slough
Uxbridge
Eastbourne
Worthing
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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