Distance From St Louis Lambert International Airport to Siem Reap International Airport, STL - REP Distance

The distance from St Louis Lambert International Airport (STL) to Siem Reap International Airport (REP) is 8718 miles or 14030 kilometers or 7571 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 Siem Reap ( Cambodia )?

A one-way nonstop (direct) flight between St Louis and Siem Reap takes around 20 hours 2 minutes.

Estimated flight time from St Louis Lambert International Airport, St Louis, United States to Siem Reap International Airport, Siem Reap, Cambodia is 20 hours 2 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 • STL - REP

Kilometers		14030 km
Statute Miles		8718 miles
Nautical Miles		7571 nm
Avg. Time of Flight		20 hours 2 minutes

St Louis Lambert International Airport to Siem Reap International Airport Flight Route Map - STL to REP Flight Path

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

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

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

Time Difference Between the Airports • STL - REP

Time difference between St Louis (United States) and Siem Reap (Cambodia) is 12 Hours.
Siem Reap time is 12 Hours ahead of St Louis.

Location	Local Time
St Louis (United States)	2025-12-17, 04:36:14 EST
Siem Reap (Cambodia)	2025-12-17, 16:36:14 +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

St Louis Lambert International Airport (STL / KSTL) St Louis, United States

Destination

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