Cheapest return flights from Philadelphia to London in September from $514

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

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

Return flights

08 Sep - 22 Sep Spirit Airlines
11 Sep - 25 Sep Spirit Airlines
17 Sep - 22 Sep Spirit Airlines
07 Sep - 12 Sep jetBlue
01 Sep - 26 Sep jetBlue
02 Sep - 07 Sep jetBlue
04 Sep - 16 Sep jetBlue
22 Sep - 27 Sep jetBlue
25 Sep - 30 Sep jetBlue
01 Sep - 24 Sep jetBlue
29 Sep - 04 Oct jetBlue
22 Sep - 06 Oct Frontier Airlines

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

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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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