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

Return flights

27 Oct - 05 Nov	Finnair
27 Oct - 03 Nov	Iberia
08 Oct - 13 Oct	Lufthansa
27 Oct - 03 Nov	British Airways	direct
10 Oct - 14 Oct	Spirit Airlines
27 Oct - 02 Nov	Delta
24 Oct - 15 Nov	Iberia
21 Oct - 29 Oct	American Airlines
15 Oct - 29 Oct	British Airways
26 Oct - 01 Nov	British Airways
22 Oct - 27 Oct	Lufthansa
15 Oct - 20 Oct	Lufthansa
13 Oct - 28 Oct	British Airways
22 Oct - 29 Oct	American Airlines	direct
26 Oct - 02 Nov	jetBlue
28 Oct - 02 Nov	TAP
16 Oct - 23 Oct	American Airlines
26 Oct - 02 Nov	Iberia	direct
28 Oct - 02 Nov	Iberia	direct
16 Oct - 20 Oct	TAP

Also check the deals for one-way flights from Philadelphia to Lisbon 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 Lisbon in October from $528

Return flights