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Cheap flights from Australia to Ontario from $643

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/12. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ONT
5 Dec — 12 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Australia to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Australia to Ontario
Explore the most affordable flight options available from Australia to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 November 2025.

Tue 4/1121:40SYD - ONT
1 stop38h 34mAlaska Airlines
Tue 11/1109:47ONT - SYD
1 stop38h 58mAlaska Airlines
Deal found 3/11$1,058
Tue 4/1121:40SYD - ONT
1 stop38h 34mAlaska Airlines
Fri 14/1109:47ONT - SYD
1 stop38h 58mAlaska Airlines
Deal found 2/11$1,134
Mon 10/1112:10SYD - ONT
1 stop19h 27mUnited Airlines
Sun 23/1118:38ONT - SYD
1 stop19h 37mUnited Airlines
Deal found 3/11$1,147
Mon 10/1112:10SYD - ONT
1 stop19h 27mUnited Airlines
Mon 24/1118:38ONT - SYD
1 stop19h 37mUnited Airlines
Deal found 4/11$1,148
Tue 18/1113:00MEL - ONT
1 stop18h 37mUnited Airlines
Tue 25/1105:05ONT - MEL
2 stops33h 55mUnited Airlines
Deal found 4/11$1,204
Thu 6/1113:00MEL - ONT
1 stop18h 37mUnited Airlines
Wed 19/1118:38ONT - MEL
1 stop20h 22mUnited Airlines
Deal found 3/11$1,205
Fri 7/1121:40SYD - ONT
1 stop38h 34mAlaska Airlines
Sun 9/1109:47ONT - SYD
1 stop38h 58mAlaska Airlines
Deal found 4/11$1,207
Mon 24/1111:40BNE - ONT
1 stop18h 57mUnited Airlines
Sun 7/1218:41ONT - BNE
1 stop18h 49mUnited Airlines
Deal found 2/11$1,207
Thu 11/1211:40BNE - ONT
1 stop23h 57mUnited Airlines
Tue 30/1213:40ONT - BNE
2 stops23h 50mUnited Airlines
Deal found 4/11$1,208
Tue 18/1111:40BNE - ONT
1 stop18h 57mUnited Airlines
Mon 29/1218:39ONT - BNE
1 stop18h 51mUnited Airlines
Deal found 3/11$1,210
Mon 17/1113:00MEL - ONT
1 stop18h 37mUnited Airlines
Sun 30/1120:38ONT - MEL
1 stop18h 22mUnited Airlines
Deal found 3/11$1,211
Tue 4/1112:10SYD - ONT
1 stop19h 27mUnited Airlines
Fri 14/1113:29ONT - SYD
2 stops46h 31mUnited Airlines
Deal found 2/11$1,224

Cheap flight deals from Australia to Ontario

Keep the following information in mind while searching for Australia to Ontario flight deals. Data was last updated 5 November 2025.

Round-trip from

$1,021

One-way from

$643

Popular in

December

Cheapest in

February

Average price

$1,287
5/3-2/4
  • 5/3-2/4
  • 4 total stops
  • 73h 30m total
  • Australia to Ontario
Search Deals
7/12
  • 7/12
  • 2 total stops
  • 28h 31m total
  • Australia to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($252 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($64 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Australia to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 5 November 2025.
Use the filters below to find and compare flights from Australia to Ontario that are best for you.

Fly from

Australia

Fly to

Ontario

Route

Depart

Return

Price

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Wed 11/3

11:50-22:35

1 stop28h 45m

Ontario

Sun 15/3

05:40-09:15

2 stops57h 35m

$1,141

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Wed 26/11

12:10-12:37

1 stop19h 27m

Ontario

Mon 8/12

18:41-09:15

1 stop19h 34m

$1,148

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Tue 9/12

14:00-12:17

1 stop17h 17m

Ontario

Tue 16/12

06:00-07:00

1 stop30h 00m

$1,148

MelbourneOntario

MEL - ONT

MELONT

Melbourne

Tue 18/11

13:00-12:37

1 stop18h 37m

Ontario

Tue 25/11

05:05-10:00

2 stops33h 55m

$1,204

BrisbaneOntario

BNE - ONT

BNEONT

Brisbane

Tue 18/11

11:40-20:44

2 stops27h 04m

Ontario

Mon 29/12

05:05-07:30

2 stops32h 25m

$1,208

BrisbaneOntario

BNE - ONT

BNEONT

Brisbane

Wed 10/12

11:40-12:17

1 stop18h 37m

Ontario

Tue 30/12

18:39-07:30

1 stop18h 51m

$1,208

BrisbaneOntario

BNE - ONT

BNEONT

Brisbane

Wed 11/2

11:40-17:43

1 stop24h 03m

Ontario

Sun 22/2

13:45-07:30

1 stop23h 45m

$1,208

BrisbaneOntario

BNE - ONT

BNEONT

Brisbane

Thu 11/12

11:40-17:37

1 stop23h 57m

Ontario

Tue 30/12

13:40-07:30

2 stops23h 50m

$1,208

BrisbaneOntario

BNE - ONT

BNEONT

Brisbane

Tue 10/2

11:40-17:43

1 stop24h 03m

Ontario

Mon 16/2

13:45-07:30

1 stop23h 45m

$1,208

BrisbaneOntario

BNE - ONT

BNEONT

Brisbane

Wed 10/12

11:40-12:17

1 stop18h 37m

Ontario

Sun 28/12

18:39-07:30

1 stop18h 51m

$1,208

Flights are sorted by cheapest return flights first.

Deals found on 3/11

Showing 1-10 of 60 results
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Best time to book a flight from Australia to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Australia with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Australia to Ontario

What is the cheapest month to book a flight from Australia to Ontario?

Currently, January is the cheapest month in which you can book a flight from Australia to Ontario (average of $696). Flying from Australia to Ontario in July is currently the most expensive (average of $985). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from AU to ONT?

Find hourly flight availability from Australia to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 November 2025.

A simple way to save on the total cost of your ticket is to fly from Australia to Ontario at midday. If you’re flexible enough to do this you can expect to save up to 27% on your trip compared to booking a flight in the evening.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated 5 November 2025.
Check out reviews from past customers who have flown with United Airlines from Australia to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,002 reviews
Check prices

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
9,002 reviews
United Airlines
7.4
Good
9,002 reviews
Check prices

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Related info for your journey

Find useful and relevant information for your journey from Australia to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from Australia?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from Australia. Ontario is conveniently located just 4.9 km from Ontario’s city centre.

  • How long is the flight from Australia to Ontario?

    United Airlines, China Airlines, and Alaska Airlines can get you from Australia to Ontario in just under 28h 45m. Your travel time can differ by up to 13h 15m. The distance between Australia and Ontario is about 12125 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Australia to Ontario one-way?

    $832 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Alaska Airlines and Hawaiian Airlines, with prices starting from $932 and $1,045, respectively.

  • What are the most popular routes from Australia to Ontario?

    While some choose either Melbourne - Ontario or Brisbane - Ontario, Sydney Kingsford Smith - Ontario is the most popular route from Australia to Ontario.

  • Can I find deals for flights from Australia to Ontario that include hotel bookings?

    Yes. In addition to deals on Australia to Ontario flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Australia to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Australia to Ontario.

  • Can I find deals for business class flights from Australia to Ontario?

    Yes. Cheapflights offers flight deals from Australia to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Australia to Ontario?

    Currently, January is the cheapest month in which you can book a flight from Australia to Ontario (average of $696). Flying from Australia to Ontario in July is currently the most expensive (average of $985). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Australia to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Australia to Ontario

Discover the top airline that operate flights from Australia to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 5 November 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,072Average$1,771FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Australia to Ontario?

Cheapflights makes it easy to find Australia to Ontario flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Australia to Ontario?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Ontario from Australia.

Can Cheapflights find flights from Australia to Ontario with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Australia to Ontario, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Australia to Ontario become cheaper?

Not ready to book yet? You can track prices for flights from Australia to Ontario on Cheapflights with our Price Alert feature and get notified when better prices are available.

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