ONT - SYD

$465 Find Cheap Flights from Ontario to Sydney

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Sydney departing on 3/28. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Sydney

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Sydney, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Sydney, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$964
United Airlines
Sun 1/18Sun 2/1
ONT - SYD • 1 stop
Cheapest one-way
$465
United Airlines
Sat 3/28
ONT - SYD • 2 stops
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Sydney!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Sydney (ONT-SYD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Sydney that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Sydney

Sun, Jan 18 - Sun, Feb 1
United Airlines Logo
6:39 pm - 9:15 am
ONT
-
SYD
19h 36m1 stop
United Airlines Logo
12:10 pm - 11:18 am
SYD
-
ONT
18h 08m1 stop
$964United Airlines
Sun, Jan 18 - Sun, Feb 1
United Airlines Logo
1:53 pm - 6:20 am
ONT
-
SYD
21h 27m1 stop
United Airlines Logo
12:10 pm - 11:18 am
SYD
-
ONT
18h 08m1 stop
$965United Airlines
Sun, Jan 18 - Sun, Feb 1
United Airlines Logo
6:39 pm - 9:15 am
ONT
-
SYD
19h 36m1 stop
United Airlines Logo
12:10 pm - 11:18 am
SYD
-
ONT
18h 08m1 stop
$966United Airlines
Sun, Jan 18 - Sun, Feb 1
United Airlines Logo
6:39 pm - 9:15 am
ONT
-
SYD
19h 36m1 stop
United Airlines Logo
12:10 pm - 11:18 am
SYD
-
ONT
18h 08m1 stop
$967United Airlines
Sun, Jan 18 - Sun, Feb 1
United Airlines Logo
1:53 pm - 6:20 am
ONT
-
SYD
21h 27m1 stop
United Airlines Logo
12:10 pm - 11:18 am
SYD
-
ONT
18h 08m1 stop
$969United Airlines
Mon, Feb 9 - Wed, Feb 18
United Airlines Logo
1:53 pm - 6:20 am
ONT
-
SYD
21h 27m1 stop
United Airlines Logo
12:10 pm - 12:48 pm
SYD
-
ONT
19h 38m1 stop
$975United Airlines
Wed, Feb 11 - Thu, Feb 19
United Airlines Logo
1:53 pm - 6:20 am
ONT
-
SYD
21h 27m1 stop
United Airlines Logo
12:10 pm - 12:38 pm
SYD
-
ONT
19h 28m1 stop
$978United Airlines
Mon, Jun 15 - Mon, Jun 22
United Airlines Logo
9:45 am - 6:55 am
ONT
-
SYD
28h 10m1 stop
United Airlines Logo
9:30 am - 5:47 pm
SYD
-
ONT
25h 17m2 stops
$979United Airlines
Sat, Feb 7 - Thu, Feb 12
United Airlines Logo
1:53 pm - 6:20 am
ONT
-
SYD
21h 27m1 stop
United Airlines Logo
2:00 pm - 12:38 pm
SYD
-
ONT
17h 38m1 stop
$981United Airlines
Sat, Jan 24 - Sun, Feb 1
United Airlines Logo
5:05 am - 9:15 am
ONT
-
SYD
33h 10m2 stops
United Airlines Logo
12:10 pm - 5:43 pm
SYD
-
ONT
24h 33m1 stop
$982United Airlines
Booking Insights

KAYAK's insights & trends for Ontario to Sydney flights

Get data-powered insights and trends into flights from Ontario to Sydney to help you find the cheapest flights, the best time to fly and much more.

Which airlines fly non-stop between Ontario and Sydney?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Ontario to Sydney.

There is just one airline that flies from Ontario to Sydney direct and that is United Airlines. The best round-trip deal found from United Airlines for the route is $926.

Good to know

Cheapest flight$465
Flight from Ontario to Sydney

When to book flights from Ontario to Sydney

Are your dates flexible? Find out the best times to travel from Ontario to Sydney based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Sydney

  • What is the cheapest flight from Ontario to Sydney?

    In the last 3 days, the lowest price for a flight from Ontario to Sydney was $465 for a one-way ticket and $964 for a round-trip.

  • Do I need a passport to fly between Ontario and Sydney?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Ontario and on arrival in Sydney.

  • Which aircraft models fly most regularly from Ontario to Sydney?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Sydney?

    Star Alliance is the only airline alliance operating flights between Ontario and Sydney.

  • How does KAYAK find such low prices on flights from Ontario to Sydney?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Sydney.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Sydney?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sydney from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Sydney?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sydney with an airline and back to Ontario with another airline. Booking your flights between Ontario and SYD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Sydney?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sydney from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Ontario to Sydney

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Sydney. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Sydney? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9132 reviews
8.1Crew
7.7Boarding
7.1Entertainment
7.3Comfort
6.6Food
Airline reviews

I’m so sorry, I can’t remember her name, I believe it was Dimpti. She was stellar, also a mature Asian flight attendant, lots of flowers in her hair, just as amazing! But literally the crew was AWESOME . Only downside is there weren’t any charging outlets. Maybe I needed to ask a flight attendant , but it would’ve been nice to have one easily accessible.

10.0 ExcellentKhahnie, Jan 2026
LAX - HNL
Read more United Airlines reviews

I’m so sorry, I can’t remember her name, I believe it was Dimpti. She was stellar, also a mature Asian flight attendant, lots of flowers in her hair, just as amazing! But literally the crew was AWESOME . Only downside is there weren’t any charging outlets. Maybe I needed to ask a flight attendant , but it would’ve been nice to have one easily accessible.

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

This was an older airplane. The cabin was constantly warm to hot throughout the 10 hour flight and there were no vents to personalize air flow. Also since it was an older plane, the material and comfort of the chairs were very uncomfortable. I left my flight with major soreness on my tailbone.

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Premium Plus is a really good idea for longer flights

Everything you need to know for your flight from Ontario to Sydney

Information on your arrival and departure airports