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

Return flights

11 Jul - 30 Aug	Spirit Airlines
29 Jul - 06 Aug	jetBlue
30 Jul - 03 Aug	jetBlue
23 Jul - 30 Jul	jetBlue
22 Jul - 27 Jul	jetBlue
30 Jul - 04 Aug	jetBlue
11 Jul - 17 Aug	Spirit Airlines
31 Jul - 03 Aug	jetBlue
16 Jul - 27 Jul	jetBlue
23 Jul - 26 Jul	jetBlue
11 Jul - 26 Jul	jetBlue
12 Jul - 26 Jul	jetBlue
18 Jul - 26 Jul	jetBlue
26 Jul - 10 Aug	Spirit Airlines
14 Jul - 21 Jul	jetBlue
26 Jul - 29 Jul	Spirit Airlines
15 Jul - 21 Jul	jetBlue
25 Jul - 01 Aug	TAP

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 $553

Return flights