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

Return flights

09 Dec - 16 Dec	Peach
02 Dec - 09 Dec	Peach
01 Dec - 05 Dec	Air China
08 Dec - 12 Dec	Air China
04 Dec - 11 Dec	Peach
11 Dec - 18 Dec	Peach
03 Dec - 10 Dec	Jeju Air
15 Dec - 19 Dec	Air China
09 Dec - 18 Dec	Asiana Airlines
13 Dec - 16 Dec	Asiana Airlines
29 Dec - 01 Jan	Asiana Airlines
27 Dec - 01 Jan	Asiana Airlines
27 Dec - 04 Jan	Asiana Airlines
29 Dec - 03 Jan	Air China
26 Dec - 03 Jan	Air China
28 Dec - 03 Jan	Air China
31 Dec - 03 Jan	Air China

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

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Osaka to Ulaanbaatar in December from 331€

Return flights