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ONT to SYD: distance & flight time
Ontario (Ontario International Airport) → Sydney (Sydney Kingsford Smith International Airport)
7,539 mi
12,132 km · 6,551 nm
15h 15m
estimated nonstop flight time
+17h
time difference · heading southwest
See live ONT→SYD fares Phone-only fares on this route — call free
Flight time details
7,539 miles nonstop takes roughly 15h 15m gate to gate, flying southwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 17-hour time gain when reading arrival times on your ticket.
The two airports
- ONT — Ontario International Airport · Ontario, United States
- SYD — Sydney Kingsford Smith International Airport · Sydney, Australia
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 SYD
- BWU · Sydney Bankstown Airport11 mi away
- CDU · Camden Airport29 mi away
- XRH · RAAF Base Richmond33 mi away
- WOL · Wollongong Airport48 mi away
Frequently asked questions
How far is ONT from SYD?
The flight distance from Ontario (ONT) to Sydney (SYD) is 7,539 miles (12,132 km, 6,551 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to SYD?
A nonstop flight takes about 15h 15m 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 Sydney?
Sydney is 17 hours ahead of Ontario.
What is the cheapest way to fly from ONT to SYD?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–SYD that never appear on search engines, with no booking fees.