AirHint found the following cheapest return flights from Phuket (HKT) to Ulaanbaatar (UBN) in September 2025 (see full year).

Return flights

10 Sep - 17 Sep	Thai VietJet Air
07 Sep - 14 Sep	Thai Lion Air
05 Sep - 12 Sep	Thai AirAsia
12 Sep - 19 Sep	Thai Lion Air
08 Sep - 15 Sep	Thai Lion Air
22 Sep - 29 Sep	AirAsia
29 Sep - 06 Oct	Thai Lion Air
15 Sep - 22 Sep	Thai AirAsia
26 Sep - 03 Oct	Thai AirAsia
20 Sep - 27 Sep	Thai Lion Air
28 Sep - 05 Oct	Thai Lion Air
13 Sep - 20 Sep	Thai Lion Air
01 Sep - 08 Sep	Thai Lion Air
27 Sep - 04 Oct	Thai Lion Air
30 Sep - 07 Oct	Thai Lion Air
25 Sep - 02 Oct	Thai VietJet Air
24 Sep - 01 Oct	Thai VietJet Air

Also check the deals for one-way flights from Phuket to Ulaanbaatar in September.

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 Phuket to Ulaanbaatar in September from 402€

Return flights