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Cheap Flights from Ontario International to Sydney

Compare Ontario International to Sydney flight deals

Find the cheapest month or even day of the year to fly to Sydney

Book the best Sydney fare with no extra fees

Flight deals from Ontario International to Sydney

Looking for a cheap last-minute deal or the best return flight from Ontario International to Sydney? Find the lowest prices on one-way and return tickets right here.
Sydney.R 6,994 per passenger.Departing Tue, 16 Sep.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Ontario International on Tue, 16 Sep, arriving in Sydney.Price includes taxes and charges.From R 6,994, select.
Sydney.R 10,550 per passenger.Departing Tue, 31 Mar.One-way flight with Lufthansa.Outbound indirect flight with Lufthansa, departs from Ontario International on Tue, 31 Mar, arriving in Sydney.Price includes taxes and charges.From R 10,550, select.
Sydney.R 11,433 per passenger.Departing Fri, 25 Jul.One-way flight with Hawaiian Airlines.Outbound indirect flight with Hawaiian Airlines, departs from Ontario International on Fri, 25 Jul, arriving in Sydney.Price includes taxes and charges.From R 11,433, select.
Sydney.R 19,349 per passenger.Departing Tue, 21 Oct.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Ontario International on Tue, 21 Oct, arriving in Sydney.Price includes taxes and charges.From R 19,349, select.
Sydney.R 19,599 per passenger.Departing Sat, 3 Jan.One-way flight with China Airlines.Outbound indirect flight with China Airlines, departs from Ontario International on Sat, 3 Jan, arriving in Sydney.Price includes taxes and charges.From R 19,599, select.
Sydney.R 19,749 per passenger.Departing Sat, 6 Dec.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Ontario International on Sat, 6 Dec, arriving in Sydney.Price includes taxes and charges.From R 19,749, select.
Sydney.R 20,157 per passenger.Departing Mon, 18 Aug.One-way flight with China Airlines.Outbound indirect flight with China Airlines, departs from Ontario International on Mon, 18 Aug, arriving in Sydney.Price includes taxes and charges.From R 20,157, select.
Sydney.R 20,588 per passenger.Departing Thu, 13 Nov.One-way flight with China Airlines.Outbound indirect flight with China Airlines, departs from Ontario International on Thu, 13 Nov, arriving in Sydney.Price includes taxes and charges.From R 20,588, select.

Find the cheapest month to fly from Ontario International to Sydney

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Sydney flights are currently cheapest in September.
Jul
from R 11,433
Aug
from R 20,157
Sep
from R 6,994
Oct
from R 19,349
Nov
from R 20,588
Dec
from R 19,749
Jan
from R 19,599
Feb
from R 20,734
Mar
from R 10,550
Apr
from R 22,896
May
from R 23,059
Jun
from R 26,257

Ontario International to Sydney: Alternative routes

Compare routes from Ontario International to Sydney below. You may find an airport to fly into that's cheaper, faster, or easier than Sydney.

Ontario to Sydney: Flight information

The things to know before you go.
Cheapest flight foundR 6,994
Cheapest month to flySeptember

Finding cheap flights from Ontario International to Sydney: Frequently asked questions

The best price we found for a return flight from Ontario International to Sydney is R 21,059. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Ontario International to Sydney. But we found flights with one or more stops from R 21,059.
As of July 2025, there are no flights flying from Ontario International to Sydney.
The cheapest month to fly from Ontario International to Sydney is usually August.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Sydney Airport on Saturday, 30 August 2025.
No airlines currently offer direct flights between Ontario International Airport and Sydney Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Sydney but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Sydney is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Lufthansa offers the cheapest flight tickets to Sydney.

Travelling from Ontario International Airport (ONT) to Sydney (Kingsford Smith) Airport (SYD): what you need to know

  • Sydney's timezone is UTC+11, making Sydney 18 hours ahead of Ontario.

  • Your ONT to SYD flight won't wait if you're running late, so get to the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're travelling internationally.

  • During popular months like August, you'll want to get to the airport earlier than normal. Plan to arrive two hours before domestic departures and four hours ahead of international flights whenever you're travelling during a peak period in general.

  • If you want to explore another city along the way, just uncheck 'Direct flights only' when searching for your ticket from Ontario International Airport to Sydney (Kingsford Smith) Airport. These are the top stopovers between ONT and SYD:

    • Dallas/Fort Worth International Airport

    • San Francisco International Airport

    • George Bush Intercontinental Airport

How to find the cheapest flights from Ontario International Airport (ONT) to Sydney (Kingsford Smith) Airport (SYD)

  • Currently, R 6,994 is the lowest price we've found for a one-way Ontario International Airport to Sydney (Kingsford Smith) Airport flight. The best price for a return ticket is R 21,059. Bear in mind that fares could change due to availability at the time of booking.

  • To score cheap tickets from ONT to SYD, book in advance. Airlines tend to offer lower prices when flights are first released.

  • The 'Whole month' search function shows you the cheapest flights from Ontario International Airport to Sydney (Kingsford Smith) Airport across the entire month. It's a good way to snap up a bargain if your travel plans aren't set in stone.

  • Finding cheap flights from ONT to SYD couldn't be easier with Price Alerts. All you need to do is set up one of these automatic alerts and we'll let you know as soon as a new deal comes up.

  • Tailor your trip with filters. Select your arrival and departure times, airlines and total journey duration. You can also sort the results by 'Best,' 'Fastest' or 'Cheapest' flights from Ontario International Airport to Sydney (Kingsford Smith) Airport.

Handy information about Ontario International Airport (ONT)

  • ONT is located at 2900 E. Airport Drive.

  • 83.6% of flights departing from Ontario International Airport reach their destination on schedule. With its reliable on-time performance, disruptions are unlikely when jetting out of ONT.

  • Central Ontario to Ontario International Airport is around 6 kilometres. Depending on traffic, it'll take you about 10 minutes to get there if you're driving, ride-sharing or catching a cab.

  • Planning to take public transport? Expect a trip time of around 1 hour 30 minutes.

  • Taking an early flight from Ontario International Airport to Sydney (Kingsford Smith) Airport? Avoid the stress of rushing to the terminal (and get some extra shut-eye) by picking one of these hotels close to ONT:

Arriving at Sydney (Kingsford Smith) Airport (SYD)

  • If you're coming in on a late Ontario International Airport to Sydney (Kingsford Smith) Airport flight, few things beat the convenience of staying close to the terminal. Grab your luggage from the carousel and then be showered and relaxing shortly after at one of these hotels near SYD:

  • Go wherever you want, whenever you want with a Sydney (Kingsford Smith) Airport rental car. Pick up a set of wheels from simba car hire, Bargain Car Rentals or Yes Drive and chase adventure across Sydney and beyond.

  • To lock in the lowest price, book your ride from Sydney (Kingsford Smith) Airport around two weeks before you travel.

Getting from Sydney (Kingsford Smith) Airport (SYD) to central Sydney

  • Sydney (Kingsford Smith) Airport to central Sydney has a drive time of about 20 minutes. It's approximately 18 kilometres away.

  • Travelling on public transport typically takes 25 minutes.

When to fly to Sydney (Kingsford Smith) Airport (SYD)

  • The quietest month for a flight from Ontario International Airport to Sydney (Kingsford Smith) Airport is April, while April is the most popular. Pick the best time to go to Sydney based on whether you prefer a bustling atmosphere or a more laid-back vibe.

  • Lock in your flight from Ontario International Airport to Sydney (Kingsford Smith) Airport for January if you'd like to explore Sydney during its warmest month. You can expect temperatures of between 17ºC (63ºF) and 32ºC (90ºF).

  • July sees average temperatures of between 5ºC (41ºF) and 19ºC (66ºF). Look for cheap tickets from ONT to SYD around that time if you like travelling in cooler conditions.

Explore more of Australia

  • You've done Sydney, now it's time to discover other corners of Australia. Travel about 241 kilometres south-west to Canberra to tick off its leading attractions. From Australian War Memorial to National Gallery of Australia and Parliament House, your itinerary will be busy.

  • If you want to check out another great destination in Australia, head for Newcastle, roughly 121 kilometres north-east of Sydney. Newcastle Beach, Nobbys Beach and Merewether Beach are the start of reasons to visit.

Plan the rest of your trip from Ontario to Sydney

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.