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

Return flights

07 Oct - 14 Oct	Austrian Airlines
23 Oct - 06 Nov	Aer Lingus
07 Oct - 21 Oct	jetBlue
01 Oct - 07 Oct	Aer Lingus
19 Oct - 28 Oct	Air Canada
27 Oct - 03 Nov	Air Canada
15 Oct - 22 Oct	United
21 Oct - 28 Oct	United
01 Oct - 07 Oct	British Airways	direct
07 Oct - 14 Oct	British Airways	direct
19 Oct - 28 Oct	British Airways	direct
15 Oct - 22 Oct	British Airways	direct
30 Oct - 13 Nov	Aer Lingus
30 Oct - 06 Nov	British Airways
30 Oct - 13 Nov	Finnair	direct
27 Oct - 03 Nov	Finnair	direct
30 Oct - 03 Nov	Aer Lingus
24 Oct - 02 Nov	Aer Lingus
24 Oct - 02 Nov	Finnair	direct

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 409€

Return flights