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ONT to REP: distance & flight time
Ontario (Ontario International Airport) → Siem-reap (Siem Reap International Airport)
8,176 mi
13,157 km · 7,104 nm
16h 30m
estimated nonstop flight time
+14h
time difference · heading northwest
See live ONT→REP fares Phone-only fares on this route — call free
Flight time details
8,176 miles nonstop takes roughly 16h 30m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 14-hour time gain when reading arrival times on your ticket.
The two airports
- ONT — Ontario International Airport · Ontario, 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 ONT
- CCB · Cable Airport6 mi away
- CNO · Chino Airport6 mi away
- LAX · Los Angeles International Airport47 mi away
- RAL · Riverside Municipal Airport11 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 ONT from REP?
The flight distance from Ontario (ONT) to Siem-reap (REP) is 8,176 miles (13,157 km, 7,104 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to REP?
A nonstop flight takes about 16h 30m 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 ONT to REP?
Nonstop service on ONT–REP 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 16h 30m nonstop estimate.
What is the time difference between Ontario and Siem-reap?
Siem-reap is 14 hours ahead of Ontario.
What is the cheapest way to fly from ONT to REP?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–REP that never appear on search engines, with no booking fees.
Why are some ONT to REP fares phone-only?
Consolidator contracts let us sell certain ONT–REP 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.