Need help booking?
Unpublished phone-only deals available
STL to REP: distance & flight time
St. Louis (St Louis Lambert International Airport) → Siem-reap (Siem Reap International Airport)
8,718 mi
14,031 km · 7,576 nm
17h 34m
estimated nonstop flight time
+12h
time difference · heading north
See live STL→REP fares Phone-only fares on this route — call free
Flight time details
8,718 miles nonstop takes roughly 17h 34m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 12-hour time gain when reading arrival times on your ticket.
The two airports
- STL — St Louis Lambert International Airport · St. Louis, United States
- REP — Siem Reap International Airport · Siem-reap, Cambodia
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near STL
- SUS · Spirit of St Louis Airport16 mi away
- ALN · St Louis Regional Airport20 mi away
- BLV · Scott AFB/Midamerica Airport32 mi away
- SPI · Abraham Lincoln Capital Airport84 mi away
Near REP
- BBM · Battambang Airport45 mi away
- KZC · Kampong Chhnang Airport95 mi away
- PXR · Surin Airport103 mi away
- TDX · Trat Airport128 mi away
Frequently asked questions
How far is STL from REP?
The flight distance from St. Louis (STL) to Siem-reap (REP) is 8,718 miles (14,031 km, 7,576 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from STL to REP?
A nonstop flight takes about 17h 34m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between St. Louis and Siem-reap?
Siem-reap is 12 hours ahead of St. Louis.
What is the cheapest way to fly from STL to REP?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on STL–REP that never appear on search engines, with no booking fees.