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GTF to REP: distance & flight time
Great Falls (Great Falls International Airport) → Siem-reap (Siem Reap International Airport)
7,703 mi
12,397 km · 6,694 nm
15h 34m
estimated nonstop flight time
+13h
time difference · heading northwest
See live GTF→REP fares Phone-only fares on this route — call free
Flight time details
7,703 miles nonstop takes roughly 15h 34m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 13-hour time gain when reading arrival times on your ticket.
The two airports
- GTF — Great Falls International Airport · Great Falls, 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 GTF
- HLN · Helena Regional Airport67 mi away
- CTB · Cut Bank International Airport91 mi away
- LWT · Lewistown Municipal Airport94 mi away
- HVR · Havre City County Airport104 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 GTF from REP?
The flight distance from Great Falls (GTF) to Siem-reap (REP) is 7,703 miles (12,397 km, 6,694 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GTF to REP?
A nonstop flight takes about 15h 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 Great Falls and Siem-reap?
Siem-reap is 13 hours ahead of Great Falls.
What is the cheapest way to fly from GTF to REP?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GTF–REP that never appear on search engines, with no booking fees.