ABE - LHR

$406 Find Cheap Flights from Allentown to London

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Allentown to London departing on 3/15. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Allentown to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Allentown to London, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$629
United Airlines
Tue 12/9Tue 12/16
ABE - LHR • 2 stops
Cheapest one-way
$406
Delta
Sun 3/15
ABE - LHR • 2 stops
Top airlines
United Airlines
Cheapest • from $629 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Flight Deals

Cheap Flights from Allentown to London (ABE-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Allentown to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Allentown to London

Tue, Dec 9 - Tue, Dec 16
United Airlines Logo
5:22 pm - 7:10 amABE-LHR
32h 48m2 stops
United Airlines Logo
7:30 am - 11:52 amLHR-ABE
33h 22m2 stops
$629United Airlines
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Tue, Dec 9 - Tue, Dec 16
KLM Logo
12:54 pm - 11:40 amABE-LHR
17h 46m1 stop
KLM Logo
8:55 am - 10:11 pmLHR-ABE
18h 16m1 stop
$647KLM
Find Deal
Thu, Jan 15 - Mon, Jan 19
Delta Logo
6:28 am - 9:00 amABE-LHR
21h 32m1 stop
Delta Logo
10:45 am - 10:50 pmLHR-ABE
17h 05m1 stop
$655Delta
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Thu, Jan 15 - Mon, Jan 19
Delta Logo
12:47 pm - 8:45 amABE-LHR
14h 58m2 stops
Delta Logo
8:55 am - 10:50 pmLHR-ABE
18h 55m1 stop
$659Delta
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Wed, Dec 31 - Wed, Jan 7
Delta Logo
6:25 am - 6:25 amABE-LHR
19h 00m1 stop
Delta Logo
8:55 am - 10:50 pmLHR-ABE
18h 55m1 stop
$722Delta
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Wed, Dec 31 - Wed, Jan 7
KLM Logo
6:25 am - 7:50 amABE-LHR
20h 25m1 stop
KLM Logo
8:55 am - 10:50 pmLHR-ABE
18h 55m1 stop
$748KLM
Find Deal
Wed, Dec 31 - Wed, Jan 7
United Airlines Logo
6:17 am - 6:40 amABE-LHR
19h 23m2 stops
United Airlines Logo
12:50 pm - 10:41 amLHR-ABE
26h 51m2 stops
$751United Airlines
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Wed, Dec 31 - Wed, Jan 7
United Airlines Logo
6:17 am - 5:55 amABE-LHR
18h 38m1 stop
United Airlines Logo
9:10 am - 9:15 pmLHR-ABE
17h 05m2 stops
$752United Airlines
Find Deal
Wed, Dec 31 - Wed, Jan 7
KLM Logo
6:25 am - 7:50 amABE-LHR
20h 25m1 stop
KLM Logo
3:50 pm - 10:50 pmLHR-ABE
36h 00m1 stop
$753KLM
Find Deal
Thu, Jan 15 - Mon, Jan 19
Multiple Airlines Logo
11:30 am - 7:10 amABE-LHR
14h 40m2 stops
Multiple Airlines Logo
1:25 pm - 10:41 amLHR-ABE
26h 16m2 stops
$755Multiple Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Allentown to London flights

Get data-powered insights and trends into flights from Allentown to London to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Allentown to London?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Allentown to London were found on United Airlines ($629) and KLM ($647).

Which airlines fly non-stop between Allentown and London Heathrow Airport?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Allentown to London Heathrow Airport.

There are 2 airlines that fly nonstop from Allentown to London Heathrow Airport. They are Delta and United Airlines. The cheapest airline for this route is Delta, with the best round-trip deal found costing $581. On average, the best prices for this route can be found at Delta.

Good to know

Cheapest flight$406
Flight from Allentown to London

When to book flights from Allentown to London

Are your dates flexible? Find out the best times to travel from Allentown to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Allentown to London flights

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

    In the last 3 days, the lowest price for a flight from Allentown to London Heathrow Airport was $406 for a one-way ticket and $629 for a round-trip.

  • Do I need a passport to fly between Allentown and London?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Allentown and on arrival in London.

  • Which airports will I be using when flying from Allentown to London?

    Allentown and London are both served by 1 main airport. You will leave Allentown from Allentown-Bethlehem and will be arriving at London Heathrow.

  • Which aircraft models fly most regularly from Allentown to London?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Allentown to London?

    Star Alliance, and SkyTeam are the airline alliances operating flights between Allentown and London, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Allentown to London, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Allentown to London are Delta and United Airlines. With an average price for the route of $724 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $824 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Allentown to London?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Allentown to London.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Allentown to London?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Allentown is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Allentown to London?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Allentown with another airline. Booking your flights between Allentown and LHR can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Allentown to London?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Allentown up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Allentown to London

 
See real verified KAYAK customer reviews for airlines flying from Allentown to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Allentown to London? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8009 reviews
7.9Entertainment
8.5Crew
7.9Comfort
8.1Boarding
7.3Food
Airline reviews

Plenty of leg room, temperature was great and staff was excellent. Would do it more often.

10.0 ExcellentJacky, Nov 2025JFK - LHR
Read more Delta reviews

Plenty of leg room, temperature was great and staff was excellent. Would do it more often.

The ticket agents in West Palm Beach on Friday afternoon Nov. 7th were incredible in getting us on an earlier plane to Atlanta during the government shutdown. Had the taken our original flight we would have missed our connection. She did this on her own, We didn't even have to ask, and she did it all with a smile and showing genuine concern that we would be taken care of. We are very grateful and thankful. We fly often, and now we will be sure to fly Delta.

Flight delayed then cancelled. Misplaced luggage. Still do not have. Rented car 1100 mile drive. I had to buy some overnight Hotels clothes toiletries gas food at my expense. Still not home. Not sure where luggage is. Over 4 hours on hold to Felta

I truly love flying with Delta. They have always treated me with the upmost respect

Our flight attendant in FIRST CLASS was one of the worst I’ve ever had. She was not at all pleasant, nor particularly good at her service.

Everything went well and was good. Nothing exceptional, but no complaints either. Cheap seats are pretty comfortable.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

Older aircraft, no meal, only food was for purchase. Not impressed United.

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

Always wish for more healthy, gluten free options. We have to bring our own.

Having a long layover, I was very appreciative of the ability to stand by for an earlier flight. Other airlines like Delta have refused this to me in the past, just to be mean (because my ticket class wasn't high enough). United went out of their way to help me get to my destination early, which I really appreciated given that it was the third leg of a 24+ hour journey for me.

Other than a way way too cold cabinets for the entire flight, all was great

One bag is incorrect and not acceptable for an international flight. The food was not just good. I won't fly with them again.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Everything you need to know for your flight from Allentown to London

Information on your arrival and departure airports