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

Return flights

23 Oct - 31 Oct	Spirit Airlines
18 Oct - 01 Nov	Spirit Airlines
20 Oct - 03 Nov	Spirit Airlines
08 Oct - 12 Oct	Frontier Airlines
05 Oct - 10 Oct	Spirit Airlines
08 Oct - 14 Oct	Spirit Airlines
08 Oct - 13 Oct	Spirit Airlines
22 Oct - 27 Oct	Spirit Airlines
27 Oct - 30 Oct	Frontier Airlines
09 Oct - 19 Oct	Frontier Airlines
09 Oct - 18 Oct	Frontier Airlines

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

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 October from 425€

Return flights