AirHint found the following cheapest return flights from Graz (GRZ) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 10 Dec - 17 Dec | Lufthansa | ||
| 19 Dec - 22 Dec | Lufthansa | ||
| 26 Dec - 31 Dec | Lufthansa | ||
| 30 Dec - 03 Jan | SunExpress |
Also check the deals for one-way flights from Graz to Lisbon in December.
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