Cheapest return flights from Bangkok to Ulaanbaatar in December from $468

AirHint found the following cheapest return flights from Bangkok (BKK) to Ulaanbaatar (UBN) in December 2025 (see full year).

Return flights

15 Dec - 22 Dec Thai AirAsia
08 Dec - 15 Dec Vietnam Airlines
12 Dec - 19 Dec Spring Airlines
10 Dec - 17 Dec Spring Airlines
07 Dec - 14 Dec Spring Airlines
09 Dec - 16 Dec China Southern
11 Dec - 18 Dec Vietnam Airlines
04 Dec - 11 Dec China Eastern
03 Dec - 10 Dec Jin Air
22 Dec - 29 Dec Thai AirAsia
31 Dec - 07 Jan MIAT Mongolian Airlines
30 Dec - 06 Jan Hainan Airlines
26 Dec - 02 Jan Air China
25 Dec - 01 Jan Air China
28 Dec - 04 Jan Air China
27 Dec - 03 Jan China Eastern
29 Dec - 05 Jan Thai AirAsia
31 Dec - 07 Jan MIAT Mongolian Airlines direct
28 Dec - 02 Jan Air China
29 Dec - 03 Jan MIAT Mongolian Airlines

Also check the deals for one-way flights from Bangkok to Ulaanbaatar in December.

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