AirHint found the following cheapest return flights from Philadelphia (PHL) to Lisbon (LIS) in October 2025 (see full year).
Return flights
| 25 Oct - 15 Nov | Spirit Airlines | ||
| 23 Oct - 15 Nov | Frontier Airlines | ||
| 22 Oct - 27 Oct | TAP | ||
| 23 Oct - 15 Nov | British Airways | direct | |
| 22 Oct - 27 Oct | Iberia | direct |
Also check the deals for one-way flights from Philadelphia to Lisbon in October.
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