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

Return flights

21 Oct - 29 Oct	TAP
10 Oct - 14 Oct	TAP
09 Oct - 17 Oct	TAP
08 Oct - 02 Nov	TAP
01 Oct - 06 Oct	TAP
29 Oct - 05 Nov	United
08 Oct - 13 Oct	TAP
10 Oct - 15 Oct	TAP
20 Oct - 27 Oct	jetBlue
14 Oct - 21 Oct	United
21 Oct - 29 Oct	Finnair	direct
24 Oct - 31 Oct	United
08 Oct - 02 Nov	Finnair	direct

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 $632

Return flights