Distance From Horner Field to Siem Reap International Airport

The distance from Horner Field () to Siem Reap International Airport (REP) is 7700 miles or 12392 kilometers or 6687 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 Great Falls ( United States ) to Siem Reap ( Cambodia )?

A one-way nonstop (direct) flight between Great Falls and Siem Reap takes around 17 hours 42 minutes.

Estimated flight time from Horner Field, Great Falls, United States to Siem Reap International Airport, Siem Reap, Cambodia is 17 hours 42 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 • - REP

Kilometers		12392 km
Statute Miles		7700 miles
Nautical Miles		6687 nm
Avg. Time of Flight		17 hours 42 minutes

Horner Field to Siem Reap International Airport Flight Route Map - to REP Flight Path

Location of Horner Field & Siem Reap International Airport is given below.
Click the map to view Great Falls to Siem Reap nonstop flight path and travel direction.

Click to see flight route on Google Map between Great Falls, United States and Siem Reap, Cambodia. .

Nonstop flight route between Great Falls, United States and Siem Reap, Cambodia.

Time Difference Between the Airports • - REP

Time difference between Great Falls (United States) and Siem Reap (Cambodia) is 13 Hours.
Siem Reap time is 13 Hours ahead of Great Falls.

Location	Local Time
Great Falls (United States)	2026-06-23, 03:07:10 MDT
Siem Reap (Cambodia)	2026-06-23, 16:07:10 +07

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

Horner Field ( / ) Great Falls, United States

Destination

Siem Reap International Airport (REP / VDSR) Siem Reap, Cambodia