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ONT to CNX: distance & flight time
Ontario (Ontario International Airport) → Chiang Mai (Chiang Mai International Airport)
8,066 mi
12,981 km · 7,009 nm
16h 17m
estimated nonstop flight time
+15h
time difference · heading northwest
See live ONT→CNX fares Phone-only fares on this route — call free
Flight time details
8,066 miles nonstop takes roughly 16h 17m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 15-hour time gain when reading arrival times on your ticket.
The two airports
- ONT — Ontario International Airport · Ontario, United States
- CNX — Chiang Mai International Airport · Chiang Mai, Thailand
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 CNX
- LPT · Lampang Airport49 mi away
- PYY · Mae Hong Son Airport54 mi away
- HGN · Mae Hong Son Airport74 mi away
- PRH · Phrae Airport90 mi away
Frequently asked questions
How far is ONT from CNX?
The flight distance from Ontario (ONT) to Chiang Mai (CNX) is 8,066 miles (12,981 km, 7,009 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to CNX?
A nonstop flight takes about 16h 17m 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 CNX?
Nonstop service on ONT–CNX 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 17m nonstop estimate.
What is the time difference between Ontario and Chiang Mai?
Chiang Mai is 15 hours ahead of Ontario.
What is the cheapest way to fly from ONT to CNX?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–CNX that never appear on search engines, with no booking fees.
Why are some ONT to CNX fares phone-only?
Consolidator contracts let us sell certain ONT–CNX 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.