Distance From Challis Airport to Siem Reap International Airport, CHL - REP Distance

The distance from Challis Airport (CHL) to Siem Reap International Airport (REP) is 7777 miles or 12516 kilometers or 6754 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 Challis ( United States ) to Siem Reap ( Cambodia )?

A one-way nonstop (direct) flight between Challis and Siem Reap takes around 17 hours 52 minutes.

Estimated flight time from Challis Airport, Challis, United States to Siem Reap International Airport, Siem Reap, Cambodia is 17 hours 52 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 • CHL - REP

Kilometers		12516 km
Statute Miles		7777 miles
Nautical Miles		6754 nm
Avg. Time of Flight		17 hours 52 minutes

Challis Airport to Siem Reap International Airport Flight Route Map - CHL to REP Flight Path

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

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

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

Time Difference Between the Airports • CHL - REP

Time difference between Challis (United States) and Siem Reap (Cambodia) is 14 Hours.
Siem Reap time is 14 Hours ahead of Challis.

Location	Local Time
Challis (United States)	2025-12-14, 12:35:23 MST
Siem Reap (Cambodia)	2025-12-15, 02:35:23 +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

Challis Airport (CHL / KLLJ) Challis, United States

Destination

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