AirHint found the following cheapest return flights from Philadelphia (PHL) to Lisbon (LIS) in October 2026 (see full year).
Return flights
| 27 Oct - 10 Nov | Finnair | ||
| 27 Oct - 10 Nov | Finnair | direct | |
| 04 Oct - 17 Oct | Aer Lingus | ||
| 17 Oct - 31 Oct | Iberia | ||
| 17 Oct - 31 Oct | Finnair | direct |
Also check the deals for one-way flights from Philadelphia to Lisbon in October.
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