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Heathrow

$406+ Cheap flights from Allentown (ABE) to Heathrow (LHR)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
ABE — LHR
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
1 adult, Economy
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Cheap flight deals from Allentown to Heathrow

Cheapest flights from Allentown to Heathrow
Explore the most affordable flight options available from Allentown to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

This United Airlines deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:20 am
ABE
-
LHR
2 stops23h 00m
United Airlines
Wed 3/186:50 am
LHR
-
ABE
2 stops31h 06m
United Airlines
Deal found 1/25$630
This United Airlines deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/106:51 pm
ABE
-
LHR
2 stops32h 19m
United Airlines
Tue 3/176:50 am
LHR
-
ABE
2 stops18h 00m
United Airlines
Deal found 1/24$633
This United Airlines deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:35 pm
ABE
-
LHR
2 stops35h 25m
United Airlines
Tue 5/197:25 am
LHR
-
ABE
2 stops38h 35m
United Airlines
Deal found 1/25$650
This Delta deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2812:52 pm
ABE
-
LHR
1 stop12h 33m
Delta
Tue 5/1211:30 am
LHR
-
ABE
2 stops16h 26m
Delta
Deal found 1/24$653
This United Airlines deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1811:50 am
ABE
-
LHR
1 stop13h 55m
United Airlines
Wed 8/268:40 am
LHR
-
ABE
2 stops34h 15m
United Airlines
Deal found 1/25$655
This KLM deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1012:56 pm
ABE
-
LHR
1 stop18h 44m
KLM
Tue 3/1710:45 am
LHR
-
ABE
1 stop16h 11m
KLM
Deal found 1/23$658
This United Airlines deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/36:15 am
ABE
-
LHR
2 stops19h 40m
United Airlines
Tue 5/127:30 am
LHR
-
ABE
2 stops18h 28m
United Airlines
Deal found 1/24$662
This Delta deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:33 am
ABE
-
LHR
1 stop18h 52m
Delta
Fri 5/151:25 pm
LHR
-
ABE
1 stop14h 31m
Delta
Deal found 1/24$675
This United Airlines deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:30 am
ABE
-
LHR
1 stop19h 15m
United Airlines
Thu 8/278:00 am
LHR
-
ABE
1 stop18h 05m
United Airlines
Deal found 1/25$678

Find flight deals from Allentown to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Allentown (ABE) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$630
(United Airlines)

One-way from

$406
(Delta)
Provider with most accurate pricing for Allentown-Bethlehem-London Heathrow flight deals.
Search Deals
Provider most trusted by Cheapflights users for Allentown-Bethlehem-London Heathrow flights.
Search Deals
From Allentown-Bethlehem to London Heathrow
Search Deals
One-way flight from Allentown-Bethlehem to London Heathrow
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Allentown to Heathrow 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, Cheapflights users made 2,558,603 searches. Data last updated January 26, 2026.
Use the filters below to find and compare flights from Allentown to London Heathrow Airport that are best for you.

Fly from

Allentown

Fly to

Heathrow

Route

Depart

Return

Price

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 3/11

6:20 am-5:55 am

1 stop19h 35m

London Heathrow

Wed 3/18

6:35 am-8:50 pm

2 stops18h 15m

$630

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 5/12

5:35 pm-10:00 am

2 stops35h 25m

London Heathrow

Tue 5/19

7:25 am-5:00 pm

2 stops38h 35m

$650

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Mon 5/4

5:59 pm-6:45 am

1 stop31h 46m

London Heathrow

Tue 5/12

11:30 am-10:56 pm

2 stops16h 26m

$658

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Mon 5/4

5:59 pm-6:45 am

1 stop31h 46m

London Heathrow

Wed 5/13

6:15 am-10:56 pm

2 stops21h 41m

$659

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 5/3

5:35 pm-6:45 am

1 stop32h 10m

London Heathrow

Tue 5/12

7:30 am-8:58 pm

2 stops18h 28m

$663

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 4/28

12:52 pm-12:35 pm

2 stops18h 43m

London Heathrow

Thu 5/14

9:20 am-5:17 pm

1 stop12h 57m

$679

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sat 5/2

5:59 pm-6:45 am

1 stop31h 46m

London Heathrow

Fri 5/15

9:20 am-10:56 pm

1 stop18h 36m

$680

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Fri 5/1

5:35 pm-8:30 am

1 stop33h 55m

London Heathrow

Tue 5/12

6:55 am-8:58 pm

2 stops19h 03m

$702

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Thu 4/30

6:33 am-6:25 am

1 stop18h 52m

London Heathrow

Wed 5/13

6:15 am-10:56 pm

2 stops21h 41m

$703

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 4/29

10:35 am-8:30 am

1 stop16h 55m

London Heathrow

Mon 5/11

7:30 am-8:58 pm

2 stops18h 28m

$707

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 19 results
1
2

Compare providers for flights from Allentown to Heathrow

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Allentown to Heathrow in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Allentown-London Heathrow Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Allentown-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Allentown-London Heathrow Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Allentown-London Heathrow Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Allentown-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Allentown to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Allentown with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Allentown to London Heathrow Airport

What is the cheapest month to book a flight from Allentown to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Allentown to London Heathrow Airport (average of $458). Flying from Allentown to London Heathrow Airport in June is currently the most expensive (average of $617). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated January 26, 2026.
Read reviews from past customers who have flown United Airlines from Allentown to London Heathrow Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,199 reviews

Comfort

7.3

Entertainment

7.1

Food

6.6

Crew

8.1

Boarding

7.7

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,199 reviews
United Airlines
7.4
Good
9,199 reviews

Comfort

7.3

Entertainment

7.1

Food

6.6

Crew

8.1

Boarding

7.7

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from Allentown to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Allentown to London Heathrow?

    Allentown-Bethlehem (ABE) is the airport you will fly out of if you book a flight from Allentown to London Heathrow. You should not have trouble finding flights to London Heathrow from Allentown-Bethlehem; the airport handles an average of 0 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 1 airline has flights from the Allentown airport to London Heathrow. It is only a 3.9 mi journey to Allentown-Bethlehem (ABE) from Allentown’s city center.

  • How long is the flight from Allentown to London Heathrow Airport?

    Airlines like United Airlines and Delta fly from Allentown to London Heathrow Airport in about 19h 35m. The time it takes to get you to your destination can typically vary by up to 12h 11m. The distance between Allentown and London Heathrow Airport is about 3507 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Allentown to London Heathrow Airport round-trip?

    United Airlines, at $690, was found to be the cheapest airline from Allentown to London Heathrow Airport..

  • Can I find deals for flights from Allentown to Heathrow that include hotel bookings?

    Yes. In addition to deals on Allentown to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Allentown to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Allentown to Heathrow.

  • Can I find deals for business class flights from Allentown to Heathrow?

    Yes. Cheapflights offers flight deals from Allentown to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Allentown to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Allentown to London Heathrow Airport (average of $458). Flying from Allentown to London Heathrow Airport in June is currently the most expensive (average of $617). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Ilford
Hounslow
Southend-on-Sea
Harrow
Croydon
Eastleigh
Gatwick
Dartford
Dover
Winchester
Orpington
Watford
Northampton
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Allentown to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Allentown to Heathrow

Discover the top airline that operate flights from Allentown to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$690Average$824FlexibilityNo cancel feeOn-time69%

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