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Cheap flights from Ontario to Sydney 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 Sydney 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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Find the cheapest flights from Ontario to Sydney

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
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
United Airlines Logo
6:50 pm - 6:55 amONT-SYD
19h 05m1 stop
United Airlines Logo
10:20 am - 12:13 pmSYD-ONT
18h 53m1 stop
$1,084United Airlines
Find Deal
Tue, Sep 9 - Tue, Sep 16
United Airlines Logo
1:42 pm - 6:55 amONT-SYD
24h 13m1 stop
United Airlines Logo
10:20 am - 5:37 pmSYD-ONT
24h 17m1 stop
$1,085United Airlines
Find Deal
Tue, Sep 9 - Wed, Sep 24
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
Find Deal
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 Sydney

Our best American Airlines deals on Ontario to Sydney 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 Sydney

Our best Alaska Airlines deals on Ontario to Sydney 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 Sydney 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 Sydney 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

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 9/9

6:50 pm-6:55 am

1 stop19h 05m

Sydney Kingsford Smith

Tue 9/16

10:20 am-12:13 pm

1 stop18h 53m

$1,084

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 9/9

1:42 pm-6:55 am

1 stop24h 13m

Sydney Kingsford Smith

Wed 9/24

10:20 am-5:37 pm

1 stop24h 17m

$1,085

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 Sydney from

How to get the cheapest flight ticket from Ontario to Sydney

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 Sydney?

The cheapest day to depart from Ontario to Sydney is on a Sunday when prices can be found for as low as $1,036. The most expensive day to fly to Sydney is Monday, with ticket prices averaging around $1,096.

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

According to our data, the cheapest time of day to fly to Sydney is in the morning. momondo users have found flights departing from Ontario to Sydney in the morning for as low as $949. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly at noon, with an average ticket price of $1,126. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Ontario to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Sydney according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Sydney (ONT to SYD) flight deals and tips

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

Direct flights

None
There are no direct flights from Ontario to Sydney. There are no popular flight routes from Ontario to Sydney.
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  • How far is Ontario to Sydney Kingsford Smith by plane?

    A flight from Ontario to Sydney Kingsford Smith will travel around 7527.4 mi. 18h 10m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Ontario Airport to Sydney Kingsford Smith Airport?

    Prices for flights from Ontario Airport to Sydney Kingsford Smith Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Sydney Kingsford Smith Airport?

  • How old do you have to be to fly from Ontario Airport to Sydney Kingsford Smith Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport to Sydney Kingsford Smith Airport.

  • What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

    The necessary travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to Sydney?

Best airlines flying from Ontario to Sydney

Compare and see reviews for airlines that fly from Ontario to Sydney with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $926Free CancellationRating
7.4
8,944 reviews
Search United Airlines flights

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Bondi Beach
Katoomba
Wollongong
Randwick
Coogee
Cronulla
Lithgow
Penrith
Manly
Leura
Charlestown
Swansea
Terrigal

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Sydney. momondo saves you time and could save you money on your trip.

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

Yes. momondo enables you to select and highlight flights to Sydney from Ontario with this policy.

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

Once all potential Ontario to Sydney flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Price alerts on flights to Sydney from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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