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Cheap flights from Allentown to London from $220

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 5/4. 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.
United Airlines Logo
10:36 am - 7:55 am
ABE
-
LHR
16h 19m
1 stop
United Airlines Logo
11:10 am - 9:56 am
LHR
-
ABE
26h 46m
2 stops
$635United Airlines
Wed, Mar 4 - Wed, Mar 11
United Airlines Logo
10:36 am - 9:10 am
ABE
-
LHR
17h 34m
2 stops
United Airlines Logo
6:50 am - 8:50 pm
LHR
-
ABE
18h 00m
2 stops
$639United Airlines
Wed, Mar 4 - Wed, Mar 11
United Airlines Logo
6:15 am - 6:45 am
ABE
-
LHR
19h 30m
1 stop
United Airlines Logo
7:30 am - 9:58 am
LHR
-
ABE
31h 28m
2 stops
$663United Airlines
Tue, Apr 14 - Thu, Apr 23
KLM Logo
6:28 am - 7:50 am
ABE
-
LHR
20h 22m
1 stop
KLM Logo
12:30 pm - 10:56 pm
LHR
-
ABE
14h 26m
1 stop
$664KLM
Wed, Mar 4 - Wed, Mar 11
United Airlines Logo
6:15 am - 5:55 am
ABE
-
LHR
18h 40m
2 stops
United Airlines Logo
7:30 am - 9:58 am
LHR
-
ABE
31h 28m
2 stops
$667United Airlines
Tue, Apr 14 - Thu, Apr 23
United Airlines Logo
6:20 am - 6:40 am
ABE
-
LHR
20h 20m
2 stops
United Airlines Logo
7:40 am - 8:50 pm
LHR
-
ABE
17h 10m
1 stop
$668United Airlines
Thu, Mar 19 - Thu, Mar 26
Delta Logo
5:59 pm - 1:15 pm
ABE
-
LHR
14h 16m
1 stop
Delta Logo
11:15 am - 11:00 pm
LHR
-
ABE
16h 45m
1 stop
$680Delta
Tue, Apr 14 - Thu, Apr 23
Delta Logo
5:58 pm - 11:20 am
ABE
-
LHR
12h 22m
1 stop
Delta Logo
9:20 am - 5:17 pm
LHR
-
ABE
12h 57m
1 stop
$730Delta
Sun, Mar 29 - Sun, Apr 5
United Airlines Logo
6:20 am - 5:55 am
ABE
-
LHR
18h 35m
1 stop
United Airlines Logo
6:50 am - 9:56 am
LHR
-
ABE
31h 06m
2 stops
$735United Airlines
Fri, Mar 6 - Mon, Mar 9
United Airlines Logo
10:31 am - 6:40 am
ABE
-
LHR
16h 09m
2 stops
United Airlines Logo
9:10 am - 8:50 pm
LHR
-
ABE
15h 40m
2 stops
$749United Airlines
Sat, Mar 21 - Sat, Mar 28

Delta flights from Allentown to London Heathrow Airport

Our best Delta deals on Allentown to London Heathrow Airport flight tickets
Delta
Apr 14
ABE5:59 pmAllentown-Bethlehem
14h 16m
1 stop
LHR1:15 pmLondon Heathrow
Apr 23
LHR11:15 amLondon Heathrow
16h 45m
1 stop
ABE11:00 pmAllentown-Bethlehem
$680
Delta
Mar 29
ABE5:58 pmAllentown-Bethlehem
12h 22m
1 stop
LHR11:20 amLondon Heathrow
Apr 5
LHR9:20 amLondon Heathrow
12h 57m
1 stop
ABE5:17 pmAllentown-Bethlehem
$730
Delta
Apr 16
ABE6:33 amAllentown-Bethlehem
18h 52m
1 stop
LHR6:25 amLondon Heathrow
Apr 24
LHR10:40 amLondon Heathrow
17h 20m
2 stops
ABE11:00 pmAllentown-Bethlehem
$733

United Airlines flights from Allentown to London Heathrow Airport

Our best United Airlines deals on Allentown to London Heathrow Airport flight tickets
United Airlines
Mar 4
ABE10:36 amAllentown-Bethlehem
16h 19m
1 stop
LHR7:55 amLondon Heathrow
Mar 11
LHR11:10 amLondon Heathrow
26h 46m
2 stops
ABE9:56 amAllentown-Bethlehem
$635
United Airlines
Mar 4
ABE10:36 amAllentown-Bethlehem
17h 34m
2 stops
LHR9:10 amLondon Heathrow
Mar 11
LHR6:50 amLondon Heathrow
18h 00m
2 stops
ABE8:50 pmAllentown-Bethlehem
$639
United Airlines
Apr 14
ABE6:15 amAllentown-Bethlehem
19h 30m
1 stop
LHR6:45 amLondon Heathrow
Apr 23
LHR7:30 amLondon Heathrow
31h 28m
2 stops
ABE9:58 amAllentown-Bethlehem
$663

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 February 4, 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

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 3/4

10:36 am-7:55 am

1 stop16h 19m

London Heathrow

Wed 3/11

11:10 am-9:56 am

2 stops26h 46m

$635

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 3/4

10:36 am-9:10 am

2 stops17h 34m

London Heathrow

Wed 3/11

6:50 am-8:50 pm

2 stops18h 00m

$639

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 4/14

6:15 am-6:45 am

1 stop19h 30m

London Heathrow

Thu 4/23

7:30 am-9:58 am

2 stops31h 28m

$663

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 3/4

6:28 am-7:50 am

1 stop20h 22m

London Heathrow

Wed 3/11

12:30 pm-10:56 pm

1 stop14h 26m

$664

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 4/14

6:15 am-5:55 am

2 stops18h 40m

London Heathrow

Thu 4/23

7:30 am-9:58 am

2 stops31h 28m

$667

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Thu 3/19

6:20 am-6:40 am

2 stops20h 20m

London Heathrow

Thu 3/26

7:40 am-8:50 pm

1 stop17h 10m

$668

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 4/14

5:59 pm-1:15 pm

1 stop14h 16m

London Heathrow

Thu 4/23

11:15 am-11:00 pm

1 stop16h 45m

$680

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 3/29

5:58 pm-11:20 am

1 stop12h 22m

London Heathrow

Sun 4/5

9:20 am-5:17 pm

1 stop12h 57m

$730

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Fri 3/6

6:20 am-5:55 am

1 stop18h 35m

London Heathrow

Mon 3/9

6:50 am-9:56 am

2 stops31h 06m

$735

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sat 3/21

10:31 am-6:40 am

2 stops16h 09m

London Heathrow

Sat 3/28

9:10 am-8:50 pm

2 stops15h 40m

$749

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 40% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 18 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

12h 37m

Direct flights

None
The fastest flight from Allentown to London Heathrow Airport takes 12h 37m
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 37m.

  • 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
Guildford
Crawley
Wembley
Dartford
Stratford-upon-Avon
Hayes
Croydon
Brentwood
Harrow
Watford
Cobham
Folkestone
Romford
Stansted

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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