Air distance from Suva, Fiji to Ulaanbaatar, Mongolia is 6327.5 Miles (10183.1 Kilometers / 5494.8 Nautical Miles).
13 hrs, 8 mins is the flight duration between Suva and Ulaanbaatar. 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.