ABE - LHR

$519 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 1/16. 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
$623
KLM
Fri 2/13Fri 2/20
ABE - LHR • 1 stop
Cheapest one-way
$519
Delta
Fri 1/16
ABE - LHR • 1 stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to London!
Flight Deals
Booking Insights
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

Fri, Feb 13 - Fri, Feb 20
KLM Logo
5:58 pm - 11:40 am
ABE
-
LHR
12h 42m1 stop
KLM Logo
6:30 am - 5:12 pm
LHR
-
ABE
15h 42m2 stops
$623KLM
Fri, Feb 6 - Tue, Feb 10
United Airlines Logo
11:30 am - 5:55 am
ABE
-
LHR
13h 25m1 stop
United Airlines Logo
6:50 am - 10:41 am
LHR
-
ABE
32h 51m2 stops
$630United Airlines
Fri, Feb 6 - Tue, Feb 10
United Airlines Logo
11:30 am - 10:25 am
ABE
-
LHR
17h 55m2 stops
United Airlines Logo
6:50 am - 9:05 pm
LHR
-
ABE
19h 15m2 stops
$634United Airlines
Mon, Jan 26 - Mon, Feb 2
United Airlines Logo
11:30 am - 6:40 am
ABE
-
LHR
14h 10m2 stops
United Airlines Logo
9:00 am - 9:05 pm
LHR
-
ABE
17h 05m2 stops
$635United Airlines
Thu, Feb 12 - Thu, Feb 19
Delta Logo
12:47 pm - 8:45 am
ABE
-
LHR
14h 58m2 stops
Delta Logo
6:30 am - 10:49 pm
LHR
-
ABE
21h 19m2 stops
$636Delta
Fri, Feb 13 - Fri, Feb 20
Virgin Atlantic Logo
12:47 pm - 6:25 am
ABE
-
LHR
12h 38m1 stop
Virgin Atlantic Logo
8:55 am - 5:12 pm
LHR
-
ABE
13h 17m1 stop
$639Virgin Atlantic
Sat, Feb 14 - Sat, Feb 21
United Airlines Logo
5:23 pm - 11:15 am
ABE
-
LHR
12h 52m1 stop
United Airlines Logo
8:30 am - 8:53 pm
LHR
-
ABE
17h 23m2 stops
$641United Airlines
Sat, Feb 14 - Sat, Feb 21
United Airlines Logo
2:55 pm - 9:20 am
ABE
-
LHR
37h 25m2 stops
United Airlines Logo
11:05 am - 10:01 am
LHR
-
ABE
51h 56m2 stops
$643United Airlines
Fri, Feb 6 - Tue, Feb 10
United Airlines Logo
11:30 am - 7:55 am
ABE
-
LHR
15h 25m1 stop
United Airlines Logo
7:25 am - 9:05 pm
LHR
-
ABE
18h 40m1 stop
$658United Airlines
Fri, Feb 13 - Fri, Feb 20
United Airlines Logo
10:36 am - 6:40 am
ABE
-
LHR
15h 04m2 stops
United Airlines Logo
9:10 am - 8:53 pm
LHR
-
ABE
16h 43m2 stops
$663United Airlines
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 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 is just one airline that flies from Allentown to London Heathrow Airport direct and that is United Airlines. The best round-trip deal found from United Airlines for the route is $690.

Good to know

Low seasonNovember
Cheapest flight$519
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly and prices are also 14% 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 $519 for a one-way ticket and $623 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 is the only airline alliance operating flights between Allentown and London Heathrow Airport.

  • 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 airline 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.
7.4
United AirlinesOverall score based on 9129 reviews
7.7Boarding
8.1Crew
7.1Entertainment
7.3Comfort
6.6Food
Airline reviews

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

10.0 ExcellentSandy, Dec 2025
TPA - ORD
Read more United Airlines reviews

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

Aircraft was noisy, old and never dimmed the lights on a night flight even on business class! I flew 17 times on United and probably another 40 on other airlines United USA /Europe flights were the worst to include luggage delayed once going to europe and once coming back

Check how old the airframe is, some older ones have inoperable seat back entertainment or power.

Sitting on the runway after we land for almost two hours! Not sure if we should blame United or Just Dumpy Vance.

Hotter than Hades in August. Why, why do crews think that in the winter when we are already dressed for cold weather we need a cabin that is 82 degrees. Even the vents were blowing hot air.

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

United is an incompetent airline. They parked the plane on the tarmac for an hour after arriving because they “didn’t have a gate available” it was actually some sort of lie because as we de planed there were approximately 9 open and manned and empty gates that we walked past. Many people on the flight missed connections for the hour long sit on the tarmac. Utterly baffling and incompetent behavior from United flight ops.

Flight was delayed. De-icing took a while. When we landed had to wait for another plane to vacate our gate. Just an overall bad experience.

I understand weather is an issue, but making us chase our plane down at five scheduled gates across three terminals in an airport the size of O'Hare was unfair. They'd have probably been better off to leave gates as TBD until the inbound plane is in final approach instead of running us all over the place. Also, props to the consistently-unprepared ground crew in Richmond for once again leaving my lane parked short of the gate because they couldn't have a crew in place on time with 2 hours notice...

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

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

Information on your arrival and departure airports