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ONT to KOS: distance & flight time
Ontario (Ontario International Airport) → Sihanoukville (Sihanoukville International Airport)
8,335 mi
13,414 km · 7,243 nm
16h 49m
estimated nonstop flight time
+14h
time difference · heading northwest
See live ONT→KOS fares Phone-only fares on this route — call free
Flight time details
8,335 miles nonstop takes roughly 16h 49m 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
- KOS — Sihanoukville International Airport · Sihanoukville, 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 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
Frequently asked questions
How far is ONT from KOS?
The flight distance from Ontario (ONT) to Sihanoukville (KOS) 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 ONT to KOS?
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.
Are there nonstop flights from ONT to KOS?
Nonstop service on ONT–KOS 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 49m nonstop estimate.
What is the time difference between Ontario and Sihanoukville?
Sihanoukville is 14 hours ahead of Ontario.
What is the cheapest way to fly from ONT to KOS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–KOS that never appear on search engines, with no booking fees.
Why are some ONT to KOS fares phone-only?
Consolidator contracts let us sell certain ONT–KOS 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.