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ONT to UTH: distance & flight time
Ontario (Ontario International Airport) → Udon Thani (Udon Thani Airport)
7,999 mi
12,874 km · 6,951 nm
16h 9m
estimated nonstop flight time
+14h
time difference · heading northwest
See live ONT→UTH fares Phone-only fares on this route — call free
Flight time details
7,999 miles nonstop takes roughly 16h 9m 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
- UTH — Udon Thani Airport · Udon Thani, 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 UTH
- VTE · Wattay International Airport44 mi away
- KKC · Khon Kaen Airport64 mi away
- LOE · Loei Airport70 mi away
- SNO · Sakon Nakhon Airport89 mi away
Frequently asked questions
How far is ONT from UTH?
The flight distance from Ontario (ONT) to Udon Thani (UTH) is 7,999 miles (12,874 km, 6,951 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to UTH?
A nonstop flight takes about 16h 9m 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 Ontario and Udon Thani?
Udon Thani is 14 hours ahead of Ontario.
What is the cheapest way to fly from ONT to UTH?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–UTH that never appear on search engines, with no booking fees.