Cheapest one-way flights from Philadelphia to London in September from 218€

AirHint found the following cheapest one-way flights from Philadelphia (PHL) to London (LHR) in September 2025 (see full year).

One-Way flights

29 Sep Spirit Airlines
28 Sep Spirit Airlines
22 Sep Spirit Airlines
26 Sep Frontier Airlines
20 Sep Spirit Airlines
23 Sep Spirit Airlines
13 Sep Spirit Airlines
16 Sep Spirit Airlines
03 Sep Spirit Airlines
01 Sep Frontier Airlines

Also check the deals for return 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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