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Cheap flights from Ontario to Australia from $448

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 9/23. 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

American Airlines Logo
6:00 am - 6:55 amONT-SYD
29h 55m1 stop
American Airlines Logo
1:20 pm - 11:43 pmSYD-ONT
28h 23m1 stop
$926American Airlines
Find Deal
Thu, Feb 19 - Thu, Mar 12
American Airlines Logo
10:57 am - 9:45 amONT-SYD
27h 48m2 stops
American Airlines Logo
2:20 pm - 10:02 pmSYD-ONT
26h 42m1 stop
$940American Airlines
Find Deal
Thu, Jan 22 - Thu, Feb 5
Logo
8:35 am - 7:45 pmONT-SYD
18h 10m1 stop
Logo
4:20 pm - 9:10 pmSYD-ONT
21h 50m1 stop
$1,049
Find Deal
Wed, Sep 10 - Wed, Sep 17
United Airlines Logo
6:38 pm - 7:30 amONT-BNE
18h 52m1 stop
United Airlines Logo
11:40 am - 12:37 pmBNE-ONT
18h 57m1 stop
$1,063United Airlines
Find Deal
Mon, Nov 3 - Sun, Nov 16
United Airlines Logo
6:38 pm - 6:30 amONT-BNE
18h 52m1 stop
United Airlines Logo
11:40 am - 12:37 pmBNE-ONT
18h 57m1 stop
$1,064United Airlines
Find Deal
Sat, Nov 1 - Mon, Nov 17
Alaska Airlines Logo
9:45 am - 7:45 pmONT-SYD
39h 00m1 stop
Alaska Airlines Logo
9:40 pm - 11:19 amSYD-ONT
32h 39m2 stops
$1,064Alaska Airlines
Find Deal
Tue, Nov 18 - Tue, Dec 2
Alaska Airlines Logo
11:59 am - 7:45 pmONT-SYD
36h 46m2 stops
Alaska Airlines Logo
9:40 pm - 8:23 pmSYD-ONT
17h 43m1 stop
$1,066Alaska Airlines
Find Deal
Tue, Nov 18 - Thu, Dec 4
Logo
11:07 am - 3:40 pmONT-SYD
34h 33m1 stop
Logo
5:20 pm - 8:37 pmSYD-ONT
21h 17m1 stop
$1,102
Find Deal
Tue, Oct 7 - Wed, Oct 22
Hawaiian Airlines Logo
9:50 am - 7:45 pmONT-SYD
38h 55m1 stop
Hawaiian Airlines Logo
9:40 pm - 9:55 pmSYD-ONT
19h 15m1 stop
$1,156Hawaiian Airlines
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Mon, Jan 19 - Sun, Feb 1
Hawaiian Airlines Logo
10:09 am - 6:45 pmONT-SYD
39h 36m1 stop
Hawaiian Airlines Logo
9:40 pm - 5:14 pmSYD-ONT
37h 34m1 stop
$1,200Hawaiian Airlines
Find Deal
Fri, Oct 3 - Sun, Oct 26

American Airlines flights from Ontario to Australia

Our best American Airlines deals on Ontario to Australia flight tickets
American Airlines
Feb 19
ONT6:00 amOntario
29h 55m
1 stop
SYD6:55 amSydney Kingsford Smith
Mar 12
SYD1:20 pmSydney Kingsford Smith
28h 23m
1 stop
ONT11:43 pmOntario
$926
Find similar
American Airlines
Jan 22
ONT10:57 amOntario
27h 48m
2 stops
SYD9:45 amSydney Kingsford Smith
Feb 5
SYD2:20 pmSydney Kingsford Smith
26h 42m
1 stop
ONT10:02 pmOntario
$940
Find similar
American Airlines
Jan 22
ONT10:57 amOntario
27h 48m
2 stops
SYD9:45 amSydney Kingsford Smith
Feb 5
SYD7:20 amSydney Kingsford Smith
29h 33m
2 stops
ONT5:53 pmOntario
$964
Find similar

Alaska Airlines flights from Ontario to Australia

Our best Alaska Airlines deals on Ontario to Australia flight tickets
Alaska Airlines
Nov 18
ONT9:45 amOntario
39h 00m
1 stop
SYD7:45 pmSydney Kingsford Smith
Dec 2
SYD9:40 pmSydney Kingsford Smith
32h 39m
2 stops
ONT11:19 amOntario
$1,064
Find similar
Alaska Airlines
Nov 18
ONT11:59 amOntario
36h 46m
2 stops
SYD7:45 pmSydney Kingsford Smith
Dec 4
SYD9:40 pmSydney Kingsford Smith
17h 43m
1 stop
ONT8:23 pmOntario
$1,066
Find similar
Alaska Airlines
Nov 19
ONT6:00 amOntario
42h 45m
2 stops
SYD7:45 pmSydney Kingsford Smith
Dec 4
SYD9:40 pmSydney Kingsford Smith
17h 43m
1 stop
ONT8:23 pmOntario
$1,069
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 August 28, 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

Thu 2/19

6:00 am-6:55 am

1 stop29h 55m

Sydney Kingsford Smith

Thu 3/12

1:20 pm-11:43 pm

1 stop28h 23m

$926

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Thu 1/22

10:57 am-9:45 am

2 stops27h 48m

Sydney Kingsford Smith

Thu 2/5

2:20 pm-10:02 pm

1 stop26h 42m

$940

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 9/10

8:35 am-7:45 pm

1 stop18h 10m

Sydney Kingsford Smith

Wed 9/17

4:20 pm-9:10 pm

1 stop21h 50m

$1,049

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Mon 11/3

6:38 pm-7:30 am

1 stop18h 52m

Brisbane

Sun 11/16

11:40 am-12:37 pm

1 stop18h 57m

$1,063

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Sat 11/1

6:38 pm-6:30 am

1 stop18h 52m

Brisbane

Mon 11/17

11:40 am-12:37 pm

1 stop18h 57m

$1,064

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 11/18

9:45 am-7:45 pm

1 stop39h 00m

Sydney Kingsford Smith

Tue 12/2

9:40 pm-11:19 am

2 stops32h 39m

$1,064

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 11/18

11:59 am-7:45 pm

2 stops36h 46m

Sydney Kingsford Smith

Thu 12/4

9:40 pm-8:23 pm

1 stop17h 43m

$1,066

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 10/7

11:07 am-3:40 pm

1 stop34h 33m

Sydney Kingsford Smith

Wed 10/22

5:20 pm-8:37 pm

1 stop21h 17m

$1,102

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Mon 1/19

9:50 am-7:45 pm

1 stop38h 55m

Sydney Kingsford Smith

Sun 2/1

9:40 pm-9:55 pm

1 stop19h 15m

$1,156

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Fri 10/3

10:09 am-6:45 pm

1 stop39h 36m

Sydney Kingsford Smith

Sun 10/26

9:40 pm-5:14 pm

1 stop37h 34m

$1,200

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Australia from

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.
Search flight deals

  • 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
8,944 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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