AirHint found the following cheapest return flights from Hong Kong (HKG) to Sofia (SOF) in December 2025 (see full year).
Return flights
| 20 Dec - 01 Jan | China Eastern | ||
| 10 Dec - 17 Dec | China Eastern | ||
| 20 Dec - 02 Jan | China Eastern | ||
| 19 Dec - 02 Jan | Juneyao Airlines | ||
| 19 Dec - 03 Jan | Juneyao Airlines |
Also check the deals for one-way flights from Hong Kong to Sofia in December.
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