Cheapest return flights from Philadelphia to London in August from $700

Best time to book flights for Philadelphia (PHL) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Philadelphia (PHL) to London (LHR) in August 2025 (see full year).

Return flights

20 Aug - 06 Sep jetBlue
27 Aug - 02 Sep jetBlue
28 Aug - 08 Sep jetBlue
20 Aug - 06 Sep Iberia direct
21 Aug - 28 Aug United
18 Aug - 25 Aug British Airways
18 Aug - 24 Aug Scandinavian Airlines
27 Aug - 02 Sep British Airways direct
18 Aug - 25 Aug British Airways direct
28 Aug - 08 Sep British Airways direct
04 Aug - 08 Aug Aer Lingus
04 Aug - 08 Aug British Airways direct

Also check the deals for one-way flights from Philadelphia to London in August.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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