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

Return flights

14 Oct - 08 Nov	British Airways
22 Oct - 31 Oct	British Airways	direct
21 Oct - 30 Oct	British Airways	direct
21 Oct - 31 Oct	British Airways	direct
13 Oct - 28 Oct	Delta
29 Oct - 05 Nov	United
21 Oct - 01 Nov	TAP
14 Oct - 16 Oct	Finnair
30 Oct - 02 Nov	TAP
22 Oct - 27 Oct	TAP
05 Oct - 25 Oct	TAP
21 Oct - 01 Nov	Finnair	direct
03 Oct - 25 Oct	TAP
14 Oct - 21 Oct	United
10 Oct - 01 Nov	TAP
30 Oct - 02 Nov	American Airlines	direct
07 Oct - 12 Oct	Spirit Airlines
10 Oct - 01 Nov	Iberia	direct
26 Oct - 02 Nov	United

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 553€

Return flights