AirHint found the following cheapest return flights from Riga (RIX) to Sofia (SOF) in December 2025 (see full year).
Return flights
| 29 Dec - 05 Jan | SkyUp Malta | ||
| 26 Dec - 31 Dec | Ryanair | ||
| 30 Dec - 06 Jan | Ryanair | ||
| 26 Dec - 29 Dec | Lufthansa | ||
| 29 Dec - 05 Jan | airBaltic | direct | |
| 26 Dec - 29 Dec | airBaltic | direct |
Also check the deals for one-way flights from Riga to Sofia in December.
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