AirHint found the following cheapest return flights from Atlanta (ATL) to Porto (OPO) in December 2025 (see full year).
Return flights
| 12 Dec - 11 Jan | Spirit Airlines | ||
| 01 Dec - 27 Dec | Lufthansa | ||
| 27 Dec - 17 Jan | KLM |
Also check the deals for one-way flights from Atlanta to Porto in December.
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