Distance From Creve Coeur Airport to Ulaanbaatar Chinggis Khaan International Airport

The distance from Creve Coeur Airport () to Ulaanbaatar Chinggis Khaan International Airport (UBN) is 6375 miles or 10259 kilometers or 5536 nautical miles.

The distance shown below is direct flight distance between airports. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface. The straight line distance is the direct route between two points, regardless of whether or not there are roads that connect them.

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How long does it take to travel from St Louis ( United States ) to Ulaanbaatar (Sergelen) ( Mongolia )?

A one-way nonstop (direct) flight between St Louis and Ulaanbaatar (Sergelen) takes around 14 hours 39 minutes.

Estimated flight time from Creve Coeur Airport, St Louis, United States to Ulaanbaatar Chinggis Khaan International Airport, Ulaanbaatar (Sergelen), Mongolia is 14 hours 39 minutes under avarage conditions. Your actual flying time may vary depending on wind direction/speed or weather conditions. This calculation does not include the departure and landing times of the aircraft. In addition, it does not cover the person identity check, ticket check-in and baggage collection times at the airport.

Travel Distance Between the Airports • - UBN

Kilometers		10259 km
Statute Miles		6375 miles
Nautical Miles		5536 nm
Avg. Time of Flight		14 hours 39 minutes

Creve Coeur Airport to Ulaanbaatar Chinggis Khaan International Airport Flight Route Map - to UBN Flight Path

Location of Creve Coeur Airport & Ulaanbaatar Chinggis Khaan International Airport is given below.
Click the map to view St Louis to Ulaanbaatar (Sergelen) nonstop flight path and travel direction.

Click to see flight route on Google Map between St Louis, United States and Ulaanbaatar (Sergelen), Mongolia. .

Nonstop flight route between St Louis, United States and Ulaanbaatar (Sergelen), Mongolia.

Time Difference Between the Airports • - UBN

Time difference between St Louis (United States) and Ulaanbaatar (Sergelen) (Mongolia) is 12 Hours.
Ulaanbaatar (Sergelen) time is 12 Hours ahead of St Louis.

Location	Local Time
St Louis (United States)	2026-03-20, 13:22:40 EDT
Ulaanbaatar (Sergelen) (Mongolia)	2026-03-21, 01:22:40 +08

Why should you arrive 3 hours before international flight? Flyers who are traveling to an international destination should arrive at the airport earlier than domestic flyers. This is because international flights can have additional check-in requirements, like passport verification, that need to be completed before you receive your boarding pass.

Origin

Creve Coeur Airport ( / 1H0) St Louis, United States

Destination

Ulaanbaatar Chinggis Khaan International Airport (UBN / ZMCK) Ulaanbaatar (Sergelen), Mongolia