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Cheap flights from Ontario to Australia from $464

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Australia departing on 2/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:05 am - 7:00 amONT-SYD
29h 55m1 stop
United Airlines Logo
12:10 pm - 5:34 pmSYD-ONT
24h 24m1 stop
$950United Airlines
Find Deal
Wed, Nov 19 - Sun, Nov 23
United Airlines Logo
1:50 pm - 6:20 amONT-SYD
21h 30m1 stop
United Airlines Logo
12:10 pm - 10:01 amSYD-ONT
16h 51m1 stop
$960United Airlines
Find Deal
Sun, Dec 7 - Tue, Dec 23
American Airlines Logo
10:47 am - 5:00 amONT-MEL
23h 13m1 stop
American Airlines Logo
4:05 pm - 10:00 pmMEL-ONT
24h 55m2 stops
$1,076American Airlines
Find Deal
Sun, Dec 7 - Sun, Dec 14
Alaska Airlines Logo
8:00 am - 7:45 pmONT-SYD
40h 45m1 stop
Alaska Airlines Logo
9:40 pm - 10:28 pmSYD-ONT
19h 48m1 stop
$1,077Alaska Airlines
Find Deal
Sat, Jan 3 - Wed, Jan 14
Alaska Airlines Logo
8:00 am - 7:45 pmONT-SYD
40h 45m1 stop
Alaska Airlines Logo
9:40 pm - 10:28 pmSYD-ONT
19h 48m1 stop
$1,083Alaska Airlines
Find Deal
Sun, Jan 4 - Wed, Jan 14
American Airlines Logo
11:59 pm - 5:00 amONT-MEL
34h 01m1 stop
American Airlines Logo
12:00 pm - 6:16 pmMEL-ONT
25h 16m2 stops
$1,084American Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 22
Multiple Airlines Logo
8:00 am - 7:35 amONT-MEL
52h 35m2 stops
Multiple Airlines Logo
9:00 pm - 10:28 pmMEL-ONT
44h 28m2 stops
$1,295Multiple Airlines
Find Deal
Sun, Jan 4 - Mon, Jan 12
Multiple Airlines Logo
8:00 am - 11:35 pmONT-MEL
44h 35m2 stops
Multiple Airlines Logo
9:00 pm - 10:28 pmMEL-ONT
44h 28m2 stops
$1,393Multiple Airlines
Find Deal
Mon, Jan 5 - Mon, Jan 12
Qatar Airways Logo
6:00 am - 6:40 pmONT-PER
45h 40m2 stops
Qatar Airways Logo
10:45 pm - 10:38 pmPER-ONT
38h 53m2 stops
$1,693Qatar Airways
Find Deal
Fri, Apr 17 - Sat, May 2
Qatar Airways Logo
11:53 am - 12:20 pmONT-PER
32h 27m2 stops
Qatar Airways Logo
10:45 pm - 6:17 pmPER-ONT
35h 32m2 stops
$1,780Qatar Airways
Find Deal
Sun, Feb 1 - Sun, Mar 1

United Airlines flights from Ontario to Australia

Our best United Airlines deals on Ontario to Australia flight tickets
United Airlines
Nov 19
ONT6:05 amOntario
29h 55m
1 stop
SYD7:00 amSydney Kingsford Smith
Nov 23
SYD12:10 pmSydney Kingsford Smith
24h 24m
1 stop
ONT5:34 pmOntario
$950
Find similar
United Airlines
Nov 9
ONT6:38 pmOntario
18h 52m
1 stop
BNE7:30 amBrisbane
Nov 25
BNE11:40 amBrisbane
18h 57m
1 stop
ONT12:37 pmOntario
$954
Find similar
United Airlines
Nov 10
ONT6:38 pmOntario
19h 37m
1 stop
SYD9:15 amSydney Kingsford Smith
Nov 24
SYD12:10 pmSydney Kingsford Smith
19h 27m
1 stop
ONT12:37 pmOntario
$957
Find similar

Alaska Airlines flights from Ontario to Australia

Our best Alaska Airlines deals on Ontario to Australia flight tickets
Alaska Airlines
Jan 3
ONT8:00 amOntario
40h 45m
1 stop
SYD7:45 pmSydney Kingsford Smith
Jan 14
SYD9:40 pmSydney Kingsford Smith
19h 48m
1 stop
ONT10:28 pmOntario
$1,077
Find similar
Alaska Airlines
Jan 4
ONT8:00 amOntario
40h 45m
1 stop
SYD7:45 pmSydney Kingsford Smith
Jan 14
SYD9:40 pmSydney Kingsford Smith
19h 48m
1 stop
ONT10:28 pmOntario
$1,083
Find similar
Alaska Airlines
Nov 16
ONT9:47 amOntario
38h 58m
1 stop
SYD7:45 pmSydney Kingsford Smith
Dec 2
SYD9:40 pmSydney Kingsford Smith
17h 43m
1 stop
ONT8:23 pmOntario
$1,152
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Australia 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, momondo users made 832,500 searches. Data last updated November 5, 2025.
Use the filters below to find and compare flights from Ontario to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 11/19

6:05 am-7:00 am

1 stop29h 55m

Sydney Kingsford Smith

Sun 11/23

12:10 pm-5:34 pm

1 stop24h 24m

$950

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sun 12/7

1:50 pm-6:20 am

1 stop21h 30m

Sydney Kingsford Smith

Tue 12/23

12:10 pm-10:01 am

1 stop16h 51m

$960

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Sun 12/7

10:47 am-5:00 am

1 stop23h 13m

Melbourne

Sun 12/14

4:05 pm-10:00 pm

2 stops24h 55m

$1,076

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 1/3

8:00 am-7:45 pm

1 stop40h 45m

Sydney Kingsford Smith

Wed 1/14

9:40 pm-10:28 pm

1 stop19h 48m

$1,077

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sun 1/4

8:00 am-7:45 pm

1 stop40h 45m

Sydney Kingsford Smith

Wed 1/14

9:40 pm-10:28 pm

1 stop19h 48m

$1,083

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Thu 12/4

11:59 pm-5:00 am

1 stop34h 01m

Melbourne

Mon 12/22

12:00 pm-6:16 pm

2 stops25h 16m

$1,084

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Sun 1/4

8:00 am-7:35 am

2 stops52h 35m

Melbourne

Mon 1/12

9:00 pm-10:28 pm

2 stops44h 28m

$1,295

OntarioMelbourne

ONT - MEL

ONTMEL

Ontario

Mon 1/5

8:00 am-11:35 pm

2 stops44h 35m

Melbourne

Mon 1/12

9:00 pm-10:28 pm

2 stops44h 28m

$1,393

OntarioPerth

ONT - PER

ONTPER

Ontario

Fri 4/17

6:00 am-6:40 pm

2 stops45h 40m

Perth

Sat 5/2

10:45 pm-10:38 pm

2 stops38h 53m

$1,693

OntarioPerth

ONT - PER

ONTPER

Ontario

Sun 2/1

11:53 am-12:20 pm

2 stops32h 27m

Perth

Sun 3/1

10:45 pm-6:17 pm

2 stops35h 32m

$1,780

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Ontario to Australia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Australia?

The cheapest day to depart from Ontario to Australia is on a Saturday. Travelers who choose to depart for Australia on a Saturday will often find tickets for as low as $878. On the other hand, Wednesday is the most expensive day to depart from Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,172.

What is the cheapest time of day to depart on your flight to Australia?

Flying to Australia from Ontario in the morning is the least expensive time of day to depart. momondo users have found prices as low as $969 when looking at flights departing in the morning. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,303 on average. Flights to Australia from Ontario in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Cheap Ontario to Australia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Australia

Direct flights

None
There are no direct flights from Ontario to Australia. There are no popular flight routes from Ontario to Australia.
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  • When did momondo last update prices for flights from Ontario Airport to Australia?

    Prices for flights from Ontario Airport to Australia are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ontario Airport to Australia?

  • How old do you have to be to fly from Ontario Airport to Australia?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Australia.

  • What documentation or ID do you need to fly to Australia?

    The required travel and health documents for your Australia trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Australia. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Ontario to Australia

Compare and see reviews for airlines that fly from Ontario to Australia with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $926Free CancellationRating
7.4
9,002 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Australia?

It is quick and easy to find Ontario to Australia flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Australia that suits you.

Can I find flights from Ontario to Australia with flexible booking policies on momondo?

All flight searches from Ontario to Australia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Australia?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Australia.

I’m not ready to book a flight from Ontario to Australia right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to Australia flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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