AirHint found the following cheapest return flights from Philadelphia (PHL) to Porto (OPO) in December 2025 (see full year).
Return flights
| 15 Dec - 10 Jan | Iberia | ||
| 25 Dec - 17 Jan | Spirit Airlines | ||
| 22 Dec - 17 Jan | Frontier Airlines | ||
| 21 Dec - 10 Jan | Frontier Airlines | ||
| 20 Dec - 10 Jan | Spirit Airlines | ||
| 21 Dec - 28 Dec | Frontier Airlines |
Also check the deals for one-way flights from Philadelphia to Porto in December.
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