Cheapest return flights from Philadelphia to London in September from 422€

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

Return flights

25 Sep - 29 Sep Spirit Airlines
08 Sep - 12 Sep Spirit Airlines
28 Sep - 05 Oct Spirit Airlines
08 Sep - 11 Sep Spirit Airlines
25 Sep - 01 Oct Spirit Airlines
10 Sep - 24 Sep Frontier Airlines
06 Sep - 11 Sep Spirit Airlines
19 Sep - 21 Sep Spirit Airlines
20 Sep - 04 Oct Spirit Airlines
09 Sep - 16 Sep jetBlue
02 Sep - 09 Sep jetBlue
17 Sep - 24 Sep Spirit Airlines
03 Sep - 09 Sep Spirit Airlines

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

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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