Expect strict security at Heathrow. Ensure all liquids are in one small bag to avoid delays during manual screening.
Round-trip from | $636 (United Airlines) |
---|---|
One-way from | $549 (Kiwi.com) |
Popular in | August |
Cheapest in | February |
Average price | $848 |
Good round-trip deal | $742 or less |
Good one-way deal | $785 or less |
Fly from
Fly to
Route
Depart
Return
Price
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Fri 8/22
7:30 am-9:31 pm
2 stops19h 01m
Philadelphia
Mon 9/8
5:15 pm-8:20 am
1 stop34h 05m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Thu 11/27
9:00 am-9:21 pm
2 stops41h 21m
Philadelphia
Thu 12/4
1:15 pm-8:05 am
2 stops37h 50m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Thu 10/9
9:30 am-4:00 pm
1 stop11h 30m
Philadelphia
Fri 10/17
5:35 pm-4:40 pm
1 stop18h 05m
LondonPhiladelphia
LGW - PHL
LGWPHL
London Gatwick
Mon 10/13
12:10 pm-9:24 pm
1 stop14h 14m
Philadelphia
Sun 10/19
6:40 pm-9:35 am
1 stop9h 55m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Thu 11/27
6:50 am-2:47 pm
2 stops12h 57m
Philadelphia
Thu 12/4
10:15 am-6:30 am
2 stops15h 15m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Fri 8/22
8:25 am-9:40 am
1 stop30h 15m
Philadelphia
Mon 9/8
6:10 pm-6:30 am
1 stop31h 20m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Tue 11/25
6:50 am-2:47 pm
2 stops12h 57m
Philadelphia
Sat 11/29
3:30 pm-11:20 am
2 stops14h 50m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Wed 8/27
8:25 am-4:55 pm
1 stop13h 30m
Philadelphia
Wed 9/3
3:10 pm-6:30 am
1 stop10h 20m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
Wed 8/27
12:30 pm-3:35 pm
Nonstop8h 05m
Philadelphia
Wed 9/10
3:40 pm-7:20 am
1 stop10h 40m
LondonPhiladelphia
LCY - PHL
LCYPHL
London City
Mon 9/8
6:05 pm-4:00 pm
2 stops26h 55m
Philadelphia
Mon 9/15
5:35 pm-12:30 pm
2 stops13h 55m
The best time to book flights from London to Philadelphia is 16 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, August is the cheapest month in which you can book a flight from London to Philadelphia (average of $236). Flying from London to Philadelphia in March is currently the most expensive (average of $295). 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.
When flying from London to Philadelphia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 15% versus a flight at noon.
The most flights from LON to PHL are scheduled on a Monday (15 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (10 on average).
Food
Entertainment
Boarding
Overall
Crew
Comfort
Reviews
Michael,Jul 2025
AMS - ATL
Food
Entertainment
Boarding
Overall
Crew
Comfort
Reviews
Michael,Jul 2025
AMS - ATL
Food
Entertainment
Boarding
Overall
Crew
Comfort
Reviews
Michael,Jul 2025
AMS - ATL
Food
Entertainment
Boarding
Overall
Crew
Comfort
Reviews
Michael,Jul 2025
AMS - ATL
Food
Entertainment
Boarding
Overall
Crew
Comfort
Reviews
Michael,Jul 2025
AMS - ATL
Food
Entertainment
Boarding
Overall
Crew
Comfort
Reviews
Michael,Jul 2025
AMS - ATL
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$559 | Average$800 | FlexibilityNo cancel fee | On-time77% | |
Cheapest$596 | Average$762 | FlexibilityNo cancel fee | On-time71% | |
Cheapest$600 | Average$793 | FlexibilityNo cancel fee | On-time70% | |
Cheapest$648 | Average$767 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$670 | Average$1,223 | FlexibilityNo cancel fee | On-timeN/A |