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Unpublished phone-only deals available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Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–UBJ that never appear on search engines, with no booking fees.