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

Return flights

19 Oct - 04 Nov	Lufthansa
21 Oct - 12 Nov	Iberia
28 Oct - 11 Nov	British Airways
21 Oct - 13 Nov	British Airways
14 Oct - 21 Oct	Lufthansa
14 Oct - 28 Oct	Lufthansa
28 Oct - 07 Nov	Iberia
21 Oct - 28 Oct	Air Canada
27 Oct - 22 Nov	Iberia
29 Oct - 12 Nov	Iberia
20 Oct - 27 Oct	Iberia
21 Oct - 27 Oct	Iberia
22 Oct - 29 Oct	British Airways
22 Oct - 16 Nov	British Airways
11 Oct - 25 Oct	Spirit Airlines
10 Oct - 25 Oct	Spirit Airlines

Also check the deals for one-way flights from Philadelphia to Porto 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 Porto in October from $484

Return flights