Distance From Boulder Municipal Airport to Ulaanbaatar Chinggis Khaan International Airport, WBU - UBN Distance

The distance from Boulder Municipal Airport (WBU) to Ulaanbaatar Chinggis Khaan International Airport (UBN) is 6067 miles or 9764 kilometers or 5269 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.

---

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

A one-way nonstop (direct) flight between Boulder and Ulaanbaatar (Sergelen) takes around 13 hours 56 minutes.

Estimated flight time from Boulder Municipal Airport, Boulder, United States to Ulaanbaatar Chinggis Khaan International Airport, Ulaanbaatar (Sergelen), Mongolia is 13 hours 56 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 • WBU - UBN

Kilometers		9764 km
Statute Miles		6067 miles
Nautical Miles		5269 nm
Avg. Time of Flight		13 hours 56 minutes

Boulder Municipal Airport to Ulaanbaatar Chinggis Khaan International Airport Flight Route Map - WBU to UBN Flight Path

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

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

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

Time Difference Between the Airports • WBU - UBN

Time difference between Boulder (United States) and Ulaanbaatar (Sergelen) (Mongolia) is 15 Hours.
Ulaanbaatar (Sergelen) time is 15 Hours ahead of Boulder.

Location	Local Time
Boulder (United States)	2025-12-16, 05:05:10 MST
Ulaanbaatar (Sergelen) (Mongolia)	2025-12-16, 20:05:10 +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

Boulder Municipal Airport (WBU / KBDU) Boulder, United States

Destination

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