Philadelphia International (PHL) to Heathrow (LHR).
| Departure | Return | Price |
|---|---|---|
| 08/05/2026 | 08/13/2026 | $855 |
| 08/05/2026 | 08/12/2026 | $870 |
| 08/05/2026 | 08/11/2026 | $875 |
| 08/05/2026 | 08/14/2026 | $989 |
| 08/03/2026 | 08/11/2026 | $991 |
| 08/03/2026 | 08/12/2026 | $991 |
| 05/24/2026 | 06/02/2026 | $1036 |
| 06/02/2026 | 06/08/2026 | $1050 |
| 08/04/2026 | 08/12/2026 | $1053 |
| 08/04/2026 | 08/13/2026 | $1053 |
Based on current fares, August is the cheapest month to fly from Philadelphia to London, with average fares around $1045 round trip (as low as $855).
See the full month-by-month and day-of-week price analysis
Best Time to Fly PHL → LHRDeparture date prices (economy, round trip). Green = cheap, red = expensive.
The cheapest month to fly from Philadelphia to London is August, with average round-trip fares around $1045. Fares in August start as low as $855. The most expensive month is June, averaging $1238.
A nonstop flight from Philadelphia to London takes approximately 7h.
The cheapest flight from Philadelphia to London currently starts at $855 round trip in economy class.
The average round-trip flight price from Philadelphia to London is $1252 in economy class.
The distance is 3400 miles (5471 km). with a nonstop flight time of about 7h. The lowest fare currently available is $855 departing in August. The average round-trip fare is $1252.
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