ABE - LHR

$399 Find Cheap Flights from Allentown to London Heathrow Airport

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 1/18. 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

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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Flight Deals

Cheap Flights from Allentown to Heathrow (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 Heathrow 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

Sun, Aug 17 - Wed, Aug 27
Delta Logo
6:00 am - 6:45 amABE-LHR
19h 45m1 stop
Delta Logo
1:05 pm - 10:39 pmLHR-ABE
14h 34m1 stop
$528Delta
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Sun, Aug 17 - Sat, Aug 30
Delta Logo
6:00 am - 6:45 amABE-LHR
19h 45m1 stop
Delta Logo
9:20 am - 5:34 pmLHR-ABE
13h 14m1 stop
$578Delta
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Sun, Aug 17 - Sun, Aug 24
Delta Logo
6:00 am - 6:45 amABE-LHR
19h 45m1 stop
Delta Logo
5:25 pm - 12:16 pmLHR-ABE
23h 51m1 stop
$584Delta
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Wed, Sep 10 - Thu, Sep 25
United Airlines Logo
1:00 pm - 6:20 amABE-LHR
12h 20m1 stop
United Airlines Logo
8:30 am - 4:53 pmLHR-ABE
13h 23m1 stop
$647United Airlines
Find Deal
Wed, Sep 10 - Thu, Sep 25
United Airlines Logo
1:00 pm - 6:20 amABE-LHR
12h 20m1 stop
United Airlines Logo
8:30 am - 4:53 pmLHR-ABE
13h 23m1 stop
$648United Airlines
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Mon, Dec 15 - Tue, Dec 23
KLM Logo
1:00 pm - 9:00 amABE-LHR
15h 00m1 stop
KLM Logo
8:55 am - 11:14 pmLHR-ABE
19h 19m1 stop
$678KLM
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Thu, Sep 25 - Thu, Oct 2
United Airlines Logo
1:00 pm - 6:20 amABE-LHR
12h 20m1 stop
United Airlines Logo
5:40 pm - 9:54 pmLHR-ABE
33h 14m2 stops
$682United Airlines
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Wed, Sep 10 - Thu, Sep 25
United Airlines Logo
1:00 pm - 6:20 amABE-LHR
12h 20m1 stop
United Airlines Logo
6:50 am - 4:53 pmLHR-ABE
15h 03m2 stops
$688United Airlines
Find Deal
Fri, Dec 26 - Fri, Jan 2
KLM Logo
6:00 am - 7:50 amABE-LHR
20h 50m1 stop
KLM Logo
8:55 am - 11:14 pmLHR-ABE
19h 19m1 stop
$1,093KLM
Find Deal
Sun, Aug 17 - Sun, Aug 24
WestJet Logo
12:56 pm - 12:05 pmABE-LHR
42h 09m2 stops
WestJet Logo
2:10 pm - 10:39 pmLHR-ABE
37h 29m2 stops
$11,268WestJet
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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 Heathrow Airport?

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 Heathrow Airport were found on Delta ($528) and United Airlines ($647).

Good to know

Low seasonNovember
Cheapest flight$399
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly and prices are also 15% lower on average.
Flight from Allentown to London Heathrow Airport

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 Heathrow Airport 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 $399 for a one-way ticket and $528 for a round-trip.

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

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

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

    Allentown and London Heathrow Airport 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 Heathrow Airport?

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

  • Which airline alliances offer flights from Allentown to London Heathrow Airport?

    Star Alliance, and SkyTeam are the airline alliances operating flights between Allentown and London Heathrow Airport, with SkyTeam 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 $742 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $753 and an overall rating of 7.4.

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

    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 Heathrow Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport 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 Heathrow Airport?

    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 Heathrow Airport 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 Heathrow Airport?

    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 Heathrow Airport 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 3 airlines serving 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.
8.0
DeltaOverall score based on 7985 reviews
7.9Entertainment
7.9Comfort
8.5Crew
8.2Boarding
7.3Food
Airline reviews

Having to up charge for a seat assignment is not good. Delta can do better

8.0 ExcellentJacob, Aug 2025SLC - LWS
Read more Delta reviews

Having to up charge for a seat assignment is not good. Delta can do better

I liked the friendliness of the staff. The cleanliness of all 3 planes.

Was charged for my luggage despite having been on one ticket from an international flight. Too tired to argue after 15 hours on flight. Was charged for rechecking it at JFK airport. Not sure why those off Kenya Airways were required to do that.

De planning was an absolute mess. We were never told that we weren’t at the gate and that we had to go down unstable stairs and then hop on a bus. People were falling, we couldn’t tell who was in charge. Overall terrible communication that ended up leaving a bad impression at the very end of the experience.

My experience on any Delta flight is always overshadowed by the time Delta removed me from a flight for no apparent reason.

Delayed and took off even later than the scheduled delay time

For a 69 year old with health problems I had the worse experience, no wheelchair when I entered a lady told me to sit and wait while a gentleman told me I had to walk to the Delta station, which I did. I had a carry on and a bag, and I was traveling with my service dog, which was on his carrier and the lady charged me for my carry on luggage, beside all the waiting cause of the delay, I had to walk to get my luggage cause no wheelchair showed up, I am so disappointed. I will get in touch with the company. I got home at 3:00 am, not good for my health situation.

Only issue was with seating. The economy fare we purchased did say there was no guarantee the three people in our party would be seated together, and we were not. At the gate, the agent told us more specifically, the fare we purchased meant we would be seated in middle seats only. This should just be made more obvious.

Great experience on Delta. Staff from baggage check to flight attendants were very courteous and professional. My only issue was a personal preference for pretzels instead of the chips and cookies that were offered.

There was no problems, just a little uncomfortable with seats that do not lay back a little

Excellent flight. Boarding was efficient and departure was on time. Smooth flight with on time arrival. Deplaning was also efficient.

This flight was perfect. No complaints and only the highest regard for the crew and ground staff and how they executed perfectly. I fly a lot with United and would request predictability and transparency in their operations instead of last minute changes.

This is for UA2274 from Houston to Sacramento. The flight was delayed arriving due to mechanical issues so we left about 3 hours later than scheduled. When boarding the plane the temperature inside was excessive - likely close to 100. Pilot apologized and said it was going to improve at altitude, which it did. But before that I honestly thought there might have been more delays removing passengers made ill from the heat. We were delayed leaving due to another mechanical issue. There was not water on the plane due to a panel that was not secured. They did that quickly, but the combination of mechanical issues was rather disturbing and did not reflect well on United.

1. when we went to check in, our 2 first class seats had been CANCELED and the flight was sold out. This was done without our prior knowledge. It was all we could do to restore one first class seat for my wife and I flew economy. 2, Our flight home was scheduled to leave at 10:30 pm. Due to tsunami warnings, the roads were closed and our flight status was uncertain as to whether it would leave as scheduled. It was announced that it would now leave at 11:20 pm and the roads were now open since the tsunami had come and gone. We made a mad dash to the airport and checked in. Delays were announced at 12:30 pm, 1:30 am, 2:30 am and at 3:30 am it was canceled. Since this was a flight due to natural (tsunami) causes, there was no compensation. We were told to return at 1:00 pm the next day and our baggage would be kept on the plane since the same plane was going to leave at 1:00 pm. We had to return to our hotel for the rest of the night. The same plane did not leave at 1:00 pm and our baggage was gone! All in all, it was a miserable performance by UA. Information was hard to obtain and no one knew what was going on and what was going to happen. Hundreds of passengers slept on the floor, chairs, etc. No food and no water was made available to the passengers. It was a situation where UA could care less what was going on. As a one million mile flyer, I had not experienced anything like this before and it was hugely disappointing!

Staff members were not helpful they ignored all calls for an attendant.

Flight was delayed and missed my connection Lufthansa didn’t respond.

Terrible. Delayed 7 hours, and cancelled the flight, leaving me stranded and out of pocket $500 for an alternative last minute flight

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

the delay for 3 hours was understandable due to weather conditions but the flight should’ve provided some on flight compensations or at least provide more food.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

Pathetic check in experience at JFK. Everything is self check in. Not enough staff present to help with when the check in process or the kiosk gets stuck. Staff present not welcoming or pleasant at all. On the other hand the NY based flight crew was great. Courteous and friendly throughout the flight. Special meals leave a lot to be desired. Kids meals should be made available when kids are flying and same goes for special kids meals too.

Flight was full, and would have preferred an aisle seat, but due to getting a late ticket ,the seat I had was adequate. The flight crew were very help full and hard working. Food and drink were excellent for the 11hr flight. Overall I was pleased with flight, and would recommend British Airways again.

More choices on menu. Seemed only thing offered was Scottish, and while that’s good for the Scot’s it doesn’t help the Americans who don’t like that food. And I really hate it when, during sleep time the attendants have a very loud conversation right over you. Lastly, I paid 5000 dollars for business class, and having to pay more to choose my seat early is really an insult. Seems greedy

The chicken adobo was a little too spicy but good otherwise. My personal opinion. Movie selection could be improved, too many horror movies. Could add a few more chick flicks! The flight was bumpy at times. We arrived a little early too! Flight attendants friendly.

Again flight was awesome except British Airways lost both gate checked luggage’s. Still missing

really bad they refused to check in luggages that I had purchased, even showing them the transaction receipt from british airways app the staff in miami was MEDIOCRE

Crew was great and responsive. Entertainment quit working with about 4 hours remaining on the flight. My seat cushion was broken.

Not very good , the stewardess were unfriendly and they don't like to be bothered. Cos was a night flight and they need to sleep.

British Airways staff are very polite and willing to help.

This particular flight wasn't very full at the back, so there were three seats available for spreading out and getting relatively comfortable

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

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