AirHint found the following cheapest return flights from Porto (OPO) to Asuncion (ASU) in December 2025 (see full year).
Return flights
| 01 Dec - 31 Jan | TAP | ||
| 17 Dec - 10 Jan | Air Europa | ||
| 15 Dec - 04 Jan | Air Europa | ||
| 19 Dec - 04 Jan | Air Europa |
Also check the deals for one-way flights from Porto to Asuncion in December.
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