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$388+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
ABE — LHR
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 December 12, 2025.

This United Airlines deal was found by Cheapflights users on 12/11. 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 12/316:17 amABE - LHR
2 stops22h 03mUnited Airlines
Wed 1/71:30 pmLHR - ABE
2 stops26h 11mUnited Airlines
Deal found 12/11$814
This Delta deal was found by Cheapflights users on 12/10. 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 12/1612:54 pmABE - LHR
2 stops18h 01mDelta
Fri 1/91:00 pmLHR - ABE
2 stops29h 06mDelta
Deal found 12/10$847
This Delta deal was found by Cheapflights users on 12/10. 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 12/166:25 amABE - LHR
2 stops19h 20mDelta
Thu 1/810:50 amLHR - ABE
2 stops17h 00mDelta
Deal found 12/10$853
This United Airlines deal was found by Cheapflights users on 12/11. 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.
Fri 12/121:00 pmABE - LHR
1 stop13h 55mUnited Airlines
Fri 12/197:25 amLHR - ABE
1 stop14h 05mUnited Airlines
Deal found 12/11$864
This Delta deal was found by Cheapflights users on 12/10. 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 12/166:25 amABE - LHR
2 stops19h 20mDelta
Wed 1/710:50 amLHR - ABE
2 stops30h 15mDelta
Deal found 12/10$865
This United Airlines deal was found by Cheapflights users on 12/10. 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 12/161:00 pmABE - LHR
1 stop17h 15mUnited Airlines
Mon 1/121:30 pmLHR - ABE
2 stops31h 52mUnited Airlines
Deal found 12/10$877
This United Airlines deal was found by Cheapflights users on 12/10. 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 12/161:00 pmABE - LHR
1 stop17h 15mUnited Airlines
Fri 1/912:50 pmLHR - ABE
2 stops26h 51mUnited Airlines
Deal found 12/10$878
This Delta deal was found by Cheapflights users on 12/10. 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 12/166:25 amABE - LHR
2 stops19h 20mDelta
Sun 1/118:55 amLHR - ABE
1 stop18h 55mDelta
Deal found 12/10$885
This United Airlines deal was found by Cheapflights users on 12/10. 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 12/235:07 pmABE - LHR
1 stop31h 48mUnited Airlines
Sat 1/103:10 pmLHR - ABE
2 stops24h 31mUnited Airlines
Deal found 12/10$892

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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$629
(Delta)

One-way from

$388
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$1,083
Provider with most accurate pricing for Allentown-Bethlehem-London Heathrow flight deals.
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Provider most trusted by Cheapflights users for Allentown-Bethlehem-London Heathrow flights.
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From Allentown-Bethlehem to London Heathrow
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One-way flight from Allentown-Bethlehem to London Heathrow
Search Deals
High demand for flights, 5% potential price rise
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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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 December 12, 2025.
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

Tue 3/17

6:25 am-6:25 am

1 stop20h 00m

London Heathrow

Wed 3/25

8:40 am-10:47 pm

2 stops18h 07m

$629

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 1/25

6:28 am-7:50 am

1 stop20h 22m

London Heathrow

Sun 2/1

12:30 pm-10:50 pm

1 stop15h 20m

$656

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Mon 3/16

12:46 pm-11:40 am

1 stop18h 54m

London Heathrow

Mon 3/23

12:30 pm-10:47 pm

1 stop14h 17m

$656

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Sun 3/15

6:25 am-6:25 am

1 stop20h 00m

London Heathrow

Mon 3/23

12:30 pm-10:47 pm

1 stop14h 17m

$656

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 3/17

12:46 pm-9:00 am

1 stop16h 14m

London Heathrow

Mon 3/23

8:55 am-10:47 pm

1 stop17h 52m

$656

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Thu 3/19

6:25 am-7:50 am

1 stop21h 25m

London Heathrow

Mon 3/23

12:30 pm-10:47 pm

1 stop14h 17m

$656

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Mon 3/16

6:25 am-6:25 am

1 stop20h 00m

London Heathrow

Mon 3/23

8:55 am-10:47 pm

1 stop17h 52m

$656

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Wed 3/18

6:25 am-7:50 am

1 stop21h 25m

London Heathrow

Mon 3/23

8:55 am-10:47 pm

1 stop17h 52m

$656

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Tue 3/17

12:46 pm-6:25 am

1 stop13h 39m

London Heathrow

Tue 3/24

10:45 am-12:06 pm

1 stop29h 21m

$661

AllentownLondon

ABE - LHR

ABELHR

Allentown-Bethlehem

Mon 3/16

6:25 am-6:25 am

1 stop20h 00m

London Heathrow

Wed 3/25

3:50 pm-12:06 pm

1 stop24h 16m

$661

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Allentown-London Heathrow Airport flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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, February is the cheapest month in which you can book a flight from Allentown to London Heathrow Airport (average of $404). 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.

What is the cheapest time of day to fly from ABE to LHR?

Find hourly flight availability from Allentown to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 12, 2025.

When flying from Allentown to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 25% versus a flight in the morning.

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 December 12, 2025.
Read reviews from past customers who have flown Delta and 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.
Delta
7.9
Good
8,007 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,007 reviews
Delta
7.9
Good
8,007 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,095 reviews
Delta
7.9
Good
8,007 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 2 airlines have 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 Delta and KLM fly from Allentown to London Heathrow Airport in about 20h. The time it takes to get you to your destination can typically vary by up to 22m. 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 are the cheapest airlines flying from Allentown to London Heathrow Airport round-trip?

    Delta, at $581, was found to be the cheapest airline from Allentown to London Heathrow Airport. An alternate airline flying to your destination would be United Airlines. Delta is priced at 27% lower than the current average price of a flight leaving 3 months from now.

  • 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, February is the cheapest month in which you can book a flight from Allentown to London Heathrow Airport (average of $404). 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
Eastleigh
Dartford
Dover
Winchester
Croydon
Orpington
Northampton
Watford
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Wembley

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 2 airlines flying from Allentown to Heathrow

Discover the top 2 airlines 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$581Average$724FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$690Average$824FlexibilityNo cancel feeOn-time69%

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