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

Return flights

08 Oct - 14 Oct	Air Canada
22 Oct - 28 Oct	Air Canada
10 Oct - 16 Oct	Air Canada
28 Oct - 02 Nov	Air Canada
02 Oct - 08 Oct	Air Canada
13 Oct - 26 Oct	Air Canada
16 Oct - 19 Oct	Austrian Airlines
17 Oct - 21 Oct	Air Canada
01 Oct - 09 Oct	Lufthansa
08 Oct - 12 Oct	Air Canada
25 Oct - 01 Nov	Air Canada
16 Oct - 21 Oct	Lufthansa
31 Oct - 07 Nov	United
26 Oct - 02 Nov	United
28 Oct - 02 Nov	British Airways	direct
26 Oct - 02 Nov	British Airways	direct
25 Oct - 01 Nov	Iberia	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 $505

Return flights