AirHint found the following cheapest return flights from Istanbul (IST) to Ulaanbaatar (UBN) in December 2025 (see full year).
Return flights
| 29 Dec - 08 Jan | Turkish Airlines | direct | |
| 29 Dec - 01 Jan | Turkish Airlines | direct | |
| 31 Dec - 04 Jan | Turkish Airlines | direct | |
| 30 Dec - 06 Jan | Flynas | ||
| 30 Dec - 03 Jan | Pegasus Airlines |
Also check the deals for one-way flights from Istanbul to Ulaanbaatar in December.
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