ONT

$720 Find Cheap Flights to Ontario – Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest return flight
$1,049
Typical prices: $1,327-$1,829
Multiple Airlines
Sat 10/11Sat 17/11
SYD - ONT • 1 stop
Cheapest one-way flight
$647
Typical prices: $665-$947
Delta
Sun 21/10
SYD - ONT • 2 stops
Top airlines
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
Top routes
SYD - ONT
Cheapest • 11% average savings
MEL - ONT
Most popular
Insights
Insights
When to travel
October
Cheapest • 18% price drop
July
Most popular
Good to know
+1
Good to know
+1
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We hope you enjoy your trip to Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights to Ontario

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals to Ontario

Tue, 10 Nov - Tue, 17 Nov
Multiple Airlines Logo
21:40 - 22:43SYD  Sydney Kingsford Smith-ONT Ontario
20h 03m1 stop Honolulu
Multiple Airlines Logo
09:55 - 19:45ONT  Ontario-SYD Sydney Kingsford Smith
38h 50m1 stop Honolulu
$1,049Multiple Airlines
Thu, 19 Nov - Tue, 8 Dec
Multiple Airlines Logo
21:40 - 22:43SYD  Sydney Kingsford Smith-ONT Ontario
20h 03m1 stop Honolulu
Multiple Airlines Logo
08:03 - 19:45ONT  Ontario-SYD Sydney Kingsford Smith
40h 42m1 stop Honolulu
$1,059Multiple Airlines
Tue, 10 Nov - Wed, 9 Dec
Multiple Airlines Logo
21:40 - 22:43SYD  Sydney Kingsford Smith-ONT Ontario
20h 03m1 stop Honolulu
Multiple Airlines Logo
08:03 - 19:45ONT  Ontario-SYD Sydney Kingsford Smith
40h 42m1 stop Honolulu
$1,118Multiple Airlines
Tue, 9 Mar - Fri, 12 Mar
Multiple Airlines Logo
21:40 - 21:28SYD  Sydney Kingsford Smith-ONT Ontario
18h 48m1 stop Honolulu
Multiple Airlines Logo
09:00 - 19:45ONT  Ontario-SYD Sydney Kingsford Smith
39h 45m1 stop Honolulu
$1,122Multiple Airlines
Tue, 17 Nov - Tue, 8 Dec
Multiple Airlines Logo
21:40 - 22:43SYD  Sydney Kingsford Smith-ONT Ontario
20h 03m1 stop Honolulu
Multiple Airlines Logo
08:03 - 19:45ONT  Ontario-SYD Sydney Kingsford Smith
40h 42m1 stop Honolulu
$1,132Multiple Airlines
Tue, 16 Feb - Tue, 23 Feb
Multiple Airlines Logo
21:40 - 21:28SYD  Sydney Kingsford Smith-ONT Ontario
18h 48m1 stop Honolulu
Multiple Airlines Logo
09:00 - 19:45ONT  Ontario-SYD Sydney Kingsford Smith
39h 45m1 stop Honolulu
$1,132Multiple Airlines
Thu, 18 Feb - Tue, 23 Feb
Multiple Airlines Logo
21:40 - 21:28SYD  Sydney Kingsford Smith-ONT Ontario
18h 48m1 stop Honolulu
Multiple Airlines Logo
09:00 - 19:45ONT  Ontario-SYD Sydney Kingsford Smith
39h 45m1 stop Honolulu
$1,132Multiple Airlines
Sun, 17 Jan - Mon, 1 Feb
Multiple Airlines Logo
21:40 - 21:18SYD  Sydney Kingsford Smith-ONT Ontario
18h 38m1 stop Honolulu
Multiple Airlines Logo
07:00 - 19:45ONT  Ontario-SYD Sydney Kingsford Smith
17h 45m1 stop Honolulu
$1,169Multiple Airlines
Thu, 29 Oct - Sat, 21 Nov
United Airlines Logo
11:50 - 15:33SYD  Sydney Kingsford Smith-ONT Ontario
21h 43m1 stop San Francisco
United Airlines Logo
13:29 - 07:00ONT  Ontario-SYD Sydney Kingsford Smith
46h 31m2 stops Denver Intl Houston George Bush Intcntl
$1,194United Airlines
Thu, 29 Oct - Sat, 21 Nov
United Airlines Logo
09:20 - 20:51SYD  Sydney Kingsford Smith-ONT Ontario
29h 31m2 stops Houston George Bush Intcntl Denver Intl
United Airlines Logo
13:29 - 07:00ONT  Ontario-SYD Sydney Kingsford Smith
46h 31m2 stops Denver Intl Houston George Bush Intcntl
$1,194United Airlines
Booking Insights

Price, demand, and travel trends for Australia to Ontario flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from Australia to Ontario with more confidence.

What is the cheapest flight to Ontario?

Sydney to Ontario is the cheapest route at $1,049 return, found in the past 5 days on KAYAK. KAYAK data shows this is also the most popular route.

How much is a flight to Ontario?

A return flight to Ontario costs $1,562 on average, based on data over the past 12 months on KAYAK. Return fares from Sydney average $1,455, while Melbourne Airport runs a bit higher at $1,467.

What is the cheapest time of day to fly to Ontario?

Morning flights to Ontario are the cheapest at $1,455 return on average. Night flights are the most expensive at $1,890.

What is a good deal for flights to Ontario?

Flights under $1,327 are considered a good deal. 25% of KAYAK users found return flights to Ontario at or below these prices, with the lowest fares from:

  • Sydney $1,127
  • Melbourne Airport $1,292
  • Brisbane $1,327
.

Find deals

Key details for flights to Ontario

Low season

February

Cheapest flight

$647
Most popular time to fly (17% more expensive on average)
Flights from Sydney to Ontario

When to book flights to Ontario

Are your dates flexible? Find out the best times to travel to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

Your questions about flights to Ontario, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.

  • What is the difference between the most popular and the most frequent airline at Ontario?

    United Airlines operates the most flights from Australia to Ontario at 0 per week, and for this route United Airlines is also the airline most often selected by KAYAK users searching for flights from Australia to Ontario. The two are sometimes different because flight volume reflects an airline's schedule, while popularity reflects traveller choice.

  • How do I know if a flight to Ontario is a good deal?

    A good deal on a flight to Ontario is around $1,327 return. This fare is in the lowest 25% of return flight prices searched on KAYAK, averaged across the cities most often searched as origins by KAYAK users.

  • Which airlines should I consider for flights to Ontario?

    United Airlines is the most popular airline for KAYAK users flying to Ontario and has the best on-time record at the destination's main airport.

Your guide to booking Ontario flights

From booking to airport arrival, find tips to help you plan your flight with more confidence.
  • For flights to Ontario, recent KAYAK data shows that stronger deals tend to be around $1,327 return. If you see a fare below that threshold, it's a good deal – book before the price climbs back up.
  • If you can choose when to go, aim to travel to Ontario in October. Return fares historically average $1,275 that month – typically the cheapest month to travel based on the last 12 months.
  • Before you book:

    • Check the route's typical price range so you can spot a deal.
    • Confirm baggage fees and seat selection costs on budget carriers.
    • Verify whether you need any travel documents beyond an ID.
    • Pick a departure airport, since your nearest may not be the cheapest origin.
  • Shift your departure to morning to save up to $435 per return. Morning flights to Ontario average $1,455 compared to $1,890 for evening flights. See the time-of-day chart above for the full breakdown.

Reviews of the top airline flying to Ontario

 
Need help choosing which airline to fly with to Ontario? 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 10208 reviews
7.3Comfort
7.7Boarding
7.1Entertainment
8.1Crew
6.7Food
Airline reviews

The flight was excellent. Their was no service as we boarded, the flight attendants spent about 30 minutes just taking and not really caring that the cabin was about 80 degrees and did not offered any beverage to first class passengers or any passenger. The flight from DEN to ONT is not long but not under an hour, we received one drink and bag of chips if you were lucky. I was in first class…. I did leave my hat on the plane and it only took less than five minutes for a United rep to locate and bring it to me.

10.0 ExcellentFred, Aug 2026
Read more United Airlines reviews

The flight was excellent. Their was no service as we boarded, the flight attendants spent about 30 minutes just taking and not really caring that the cabin was about 80 degrees and did not offered any beverage to first class passengers or any passenger. The flight from DEN to ONT is not long but not under an hour, we received one drink and bag of chips if you were lucky. I was in first class…. I did leave my hat on the plane and it only took less than five minutes for a United rep to locate and bring it to me.

Uncomfortable plastic seats even in premium economy. No free wifi. Even paid wifi was spotty to nonexistent. Bad food. Much worse than economy on foreign carriers like Qantas.

Good flight. However, when booked flight with United, assumed the layover included by United in San Francisco of 1 hr and 40 minutes was sufficient . Not so and would recommend at least 2 hours or more. Needed to go through US immigration (very long lineups), then pick up bags, take all the way to another terminal, running because we did not have sufficient time. We made the flight because they held the door for us but luggage didn’t follow.

It was good but only meal served is very less. Meantime good to add rice and chicken in one of meal

I found the staff to not be very attentive at all. When paying for Business Class you expect a certain type of service and that was not found. They were almost rude even

Great. Food going from Australia to the US was better than other way around, but still needs improvement in terms of quality and quantity!!!

Crew seemed annoyed by the fact we were there. Very unpleasant

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

Due to a cancelled flight the day before this flight only had 44 people. Best flight ever on international route. Food getting better. Can United provide fruit ex apples and bananas for snacks? Crew fantastic.

Honestly didn’t like anything. Crew was in rush . Food was ok and there was no whiskey. Have to pay extra $ if you want to drink whiskey . They only provide wine and beer.

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