AirHint found the following cheapest one-way flights from Philadelphia (PHL) to Lisbon (LIS) in December 2025 (see full year).
One-Way flights
| 07 Dec | Spirit Airlines | ||
| 07 Dec | Iberia | direct | |
| 20 Dec | Air Canada | ||
| 20 Dec | British Airways | direct |
Also check the deals for return flights from Philadelphia to Lisbon in December.
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