Need help booking?
Unpublished phone-only deals available
REP to STL: distance & flight time
Siem-reap (Siem Reap International Airport) → St. Louis (St Louis Lambert International Airport)
8,718 mi
14,031 km · 7,576 nm
17h 34m
estimated nonstop flight time
-12h
time difference · heading north
See live REP→STL 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 set-back when reading arrival times on your ticket.
The two airports
- REP — Siem Reap International Airport · Siem-reap, Cambodia
- STL — St Louis Lambert International Airport · St. Louis, United States
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 REP
- BBM · Battambang Airport45 mi away
- KZC · Kampong Chhnang Airport95 mi away
- PXR · Surin Airport103 mi away
- TDX · Trat Airport128 mi away
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
Frequently asked questions
How far is REP from STL?
The flight distance from Siem-reap (REP) to St. Louis (STL) 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 REP to STL?
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.
Are there nonstop flights from REP to STL?
Nonstop service on REP–STL depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 17h 34m nonstop estimate.
What is the time difference between Siem-reap and St. Louis?
St. Louis is 12 hours behind Siem-reap.
What is the cheapest way to fly from REP to STL?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on REP–STL that never appear on search engines, with no booking fees.
Why are some REP to STL fares phone-only?
Consolidator contracts let us sell certain REP–STL tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.