Need help booking?
Unpublished phone-only deals available
UBJ to ONT: distance & flight time
Yamaguchi (Yamaguchi Ube Airport) → Ontario (Ontario International Airport)
5,961 mi
9,594 km · 5,180 nm
12h 9m
estimated nonstop flight time
-16h
time difference · heading northeast
See live UBJ→ONT fares Phone-only fares on this route — call free
Flight time details
5,961 miles nonstop takes roughly 12h 9m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 16-hour time set-back when reading arrival times on your ticket.
The two airports
- UBJ — Yamaguchi Ube Airport · Yamaguchi, Japan
- 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 UBJ
- KKJ · Kitakyūshū Airport15 mi away
- OIT · Oita Airport41 mi away
- FUK · Fukuoka Airport53 mi away
- IWK · Iwakuni Marine Corps Air Station57 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 UBJ from ONT?
The flight distance from Yamaguchi (UBJ) to Ontario (ONT) is 5,961 miles (9,594 km, 5,180 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from UBJ to ONT?
A nonstop flight takes about 12h 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 Yamaguchi and Ontario?
Ontario is 16 hours behind Yamaguchi.
What is the cheapest way to fly from UBJ to ONT?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on UBJ–ONT that never appear on search engines, with no booking fees.