Air distance from Beijing, China to Ulaanbaatar, Mongolia is 734 Miles (1181.3 Kilometers / 637.4 Nautical Miles).
Flight duration time from Beijing to Ulaanbaatar is 1 hrs, 45 mins. This is the In-The-Air flight time. You should also add the taxi time, airport wait times and possible delays due to bad weather, etc. for the total flight duration time.