Cheapest return flights from Phnom-penh to Ulaanbaatar in September from $523

AirHint found the following cheapest return flights from Phnom-penh (PNH) to Ulaanbaatar (UBN) in September 2025 (see full year).

Return flights

17 Sep - 27 Sep Cathay Pacific

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

Skyscanner

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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