AirHint found the following cheapest return flights from Grenoble (GNB) to Porto (OPO) in December 2025 (see full year).
Return flights
| 06 Dec - 13 Dec | Wizz Air UK | ||
| 24 Dec - 29 Dec | Ryanair | ||
| 21 Dec - 03 Jan | Jet2 | ||
| 18 Dec - 27 Dec | British Airways | ||
| 20 Dec - 02 Jan | British Airways | ||
| 20 Dec - 03 Jan | British Airways |
Also check the deals for one-way flights from Grenoble to Porto in December.
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