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

Return flights

12 Jul - 31 Aug	Spirit Airlines
07 Jul - 31 Aug	Frontier Airlines
06 Jul - 31 Aug	Frontier Airlines
21 Jul - 26 Jul	jetBlue
21 Jul - 28 Jul	Spirit Airlines
16 Jul - 25 Jul	jetBlue
23 Jul - 28 Jul	Spirit Airlines
20 Jul - 30 Jul	jetBlue
21 Jul - 31 Jul	jetBlue
31 Jul - 11 Aug	Spirit Airlines
14 Jul - 18 Jul	Spirit Airlines
15 Jul - 12 Aug	Frontier Airlines
22 Jul - 25 Jul	Spirit Airlines
14 Jul - 15 Jul	Spirit Airlines
17 Jul - 24 Jul	Spirit Airlines
26 Jul - 10 Aug	Spirit Airlines
27 Jul - 01 Aug	Frontier Airlines

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

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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Cheapest return flights from Philadelphia to London in July from 482€

Return flights