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KOS to ONT: distance & flight time
Sihanoukville (Sihanoukville International Airport) → Ontario (Ontario International Airport)
8,335 mi
13,414 km · 7,243 nm
16h 49m
estimated nonstop flight time
-14h
time difference · heading northeast
See live KOS→ONT fares Phone-only fares on this route — call free
Flight time details
8,335 miles nonstop takes roughly 16h 49m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 14-hour time set-back when reading arrival times on your ticket.
The two airports
- KOS — Sihanoukville International Airport · Sihanoukville, Cambodia
- ONT — Ontario International Airport · Ontario, 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 KOS
- PQC · Phu Quoc International Airport37 mi away
- PNH · Phnom Penh International Airport106 mi away
- VKG · Rach Gia Airport110 mi away
- KZC · Kampong Chhnang Airport132 mi away
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
Frequently asked questions
How far is KOS from ONT?
The flight distance from Sihanoukville (KOS) to Ontario (ONT) is 8,335 miles (13,414 km, 7,243 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from KOS to ONT?
A nonstop flight takes about 16h 49m 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 Sihanoukville and Ontario?
Ontario is 14 hours behind Sihanoukville.
What is the cheapest way to fly from KOS to ONT?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on KOS–ONT that never appear on search engines, with no booking fees.