AirHint found the following cheapest return flights from Buenos Aires (EZE) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 24 Dec - 01 Jan | Iberia | ||
| 31 Dec - 14 Jan | Iberia | ||
| 31 Dec - 18 Jan | Iberia | ||
| 21 Dec - 03 Jan | Iberia | ||
| 27 Dec - 05 Jan | Iberia | ||
| 26 Dec - 31 Jan | Aeromexico | ||
| 28 Dec - 09 Jan | Copa | ||
| 27 Dec - 31 Jan | Copa |
Also check the deals for one-way flights from Buenos Aires to Lisbon in December.
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