Expect strict security at Heathrow. Ensure all liquids are in one small bag to avoid delays during manual screening.

Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $688 (Air Canada) |
One-way from | $493 (British Airways) |
Popular in | December |
Cheapest in | February |
Average price | $720 |
Good round-trip deal | $703 or less |
Good one-way deal | $644 or less |
Fly from
Fly to
Route
Depart
Return
Price
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
jue. 1/8
9:00 am-3:49 pm
2 stops35h 49m
Philadelphia
jue. 1/15
3:01 pm-11:15 am
2 stops15h 14m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
jue. 1/8
9:20 am-6:23 pm
1 stop14h 03m
Philadelphia
jue. 1/15
1:30 pm-6:55 am
1 stop12h 25m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
jue. 1/15
6:30 am-6:54 pm
2 stops17h 24m
Philadelphia
vie. 1/30
4:35 pm-8:35 pm
2 stops23h 00m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
lun. 12/15
7:50 am-2:00 pm
1 stop11h 10m
Philadelphia
mar. 12/23
7:45 pm-7:50 am
Nonstop7h 05m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
sáb. 12/6
7:50 am-2:00 pm
1 stop11h 10m
Philadelphia
lun. 12/29
9:15 pm-2:40 pm
1 stop12h 25m
LondonPhiladelphia
LGW - PHL
LGWPHL
London Gatwick
mar. 2/24
4:35 pm-6:31 pm
2 stops30h 56m
Philadelphia
mar. 3/3
3:02 pm-3:45 pm
2 stops19h 43m
LondonPhiladelphia
LCY - PHL
LCYPHL
London City
mar. 12/2
6:50 am-1:55 pm
1 stop12h 05m
Philadelphia
mar. 12/9
11:03 am-2:05 pm
2 stops22h 02m
LondonPhiladelphia
LCY - PHL
LCYPHL
London City
jue. 12/4
6:50 am-2:00 pm
1 stop12h 10m
Philadelphia
lun. 12/8
7:56 pm-2:35 pm
1 stop13h 39m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
jue. 12/25
1:10 pm-4:15 pm
Nonstop8h 05m
Philadelphia
mié. 1/7
3:42 pm-9:20 am
1 stop12h 38m
LondonPhiladelphia
LHR - PHL
LHRPHL
London Heathrow
jue. 1/15
6:30 am-2:05 pm
1 stop12h 35m
Philadelphia
vie. 1/30
6:35 pm-6:35 am
Nonstop7h 00m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
The best time to book flights from London to Philadelphia is 73 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 $130). Flying from London to Philadelphia in July is currently the most expensive (average of $455). 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 decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
The most flights from LON to PHL are scheduled on a Monday (10 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (10 on average).
Dublin (DUB) – chosen by Cheapflights users on 71% of 1-stop itineraries from London to Philadelphia on Cheapflights.
Boston (BOS) is the most affordable 1-stop option, with an average round-trip price of $872.
Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 10h 23m.
Flights via Dublin (DUB) offer the fastest connection on this route, with an average layover time of 1h 48m.
About 18% of weekly flights between London and Philadelphia have experienced delays in the past year, with the average delay time being 171 minutes.
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
Wednesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Over the last year, La Compagnie have had the lowest number of delays on this route, with no flights being classified as delayed.
Crew
Entertainment
Overall
Food
Boarding
Comfort
Reviews
Anonymous,May 2025
FRA - DFW
Crew
Entertainment
Overall
Food
Boarding
Comfort
Reviews
Anonymous,May 2025
FRA - DFW
Crew
Entertainment
Overall
Food
Boarding
Comfort
Reviews
Anonymous,May 2025
FRA - DFW
Crew
Entertainment
Overall
Food
Boarding
Comfort
Reviews
Anonymous,May 2025
FRA - DFW
Crew
Entertainment
Overall
Food
Boarding
Comfort
Reviews
Anonymous,May 2025
FRA - DFW
Crew
Entertainment
Overall
Food
Boarding
Comfort
Reviews
Anonymous,May 2025
FRA - DFW
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$559 | Average$794 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$597 | Average$814 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$618 | Average$804 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$642 | Average$767 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$670 | Average$1,182 | FlexibilityNo cancel fee | On-timeN/A |