ONT

$640 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
$1,179
Typical prices: $1,244-$1,626
United Airlines
Mon 29/10Fri 2/11
SYD - ONT • 2 stops
Cheapest one-way flight
$640
Typical prices: $761-$950
Delta
Sun 18/11
SYD - ONT • 2 stops
Top airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
Top routes
Cheapest • 20% average savings
Most popular
Insights
Insights
When to travel
Cheapest • 22% price drop
Most popular
Good to know
+1
Good to know
+1
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We hope you enjoy your trip to Ontario!
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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

Thu, 29 Oct - Mon, 2 Nov
United Airlines Logo
11:50 - 20:15Sydney  Sydney Kingsford Smith-Ontario Ontario
26h 25m1 stop San Francisco
United Airlines Logo
06:00 - 09:20Ontario  Ontario-Sydney Sydney Kingsford Smith
32h 20m1 stop San Francisco
$1,179United Airlines
2 days ago
Tue, 27 Oct - Sun, 8 Nov
United Airlines Logo
11:50 - 12:29Sydney  Sydney Kingsford Smith-Ontario Ontario
18h 39m1 stop San Francisco
United Airlines Logo
18:37 - 09:20Ontario  Ontario-Sydney Sydney Kingsford Smith
19h 43m1 stop San Francisco
$1,179United Airlines
2 days ago
Mon, 16 Nov - Sun, 22 Nov
United Airlines Logo
11:50 - 12:29Sydney  Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
United Airlines Logo
16:17 - 09:20Ontario  Ontario-Sydney Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,179United Airlines
1 day ago
Mon, 2 Nov - Mon, 9 Nov
United Airlines Logo
11:50 - 12:29Sydney  Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
United Airlines Logo
18:37 - 09:20Ontario  Ontario-Sydney Sydney Kingsford Smith
19h 43m1 stop San Francisco
$1,179United Airlines
1 day ago
Mon, 1 Mar - Tue, 27 Apr
United Airlines Logo
11:50 - 09:47Sydney  Sydney Kingsford Smith-Ontario Ontario
16h 57m1 stop San Francisco
United Airlines Logo
13:00 - 06:55Ontario  Ontario-Sydney Sydney Kingsford Smith
24h 55m2 stops Denver Intl San Francisco
$1,179United Airlines
1 day ago
Mon, 1 Mar - Tue, 27 Apr
United Airlines Logo
11:50 - 09:47Sydney  Sydney Kingsford Smith-Ontario Ontario
16h 57m1 stop San Francisco
United Airlines Logo
18:53 - 06:55Ontario  Ontario-Sydney Sydney Kingsford Smith
19h 02m1 stop San Francisco
$1,179United Airlines
1 day ago
Wed, 2 Dec - Tue, 12 Jan
United Airlines Logo
11:50 - 09:38Sydney  Sydney Kingsford Smith-Ontario Ontario
16h 48m1 stop San Francisco
United Airlines Logo
09:45 - 09:20Ontario  Ontario-Sydney Sydney Kingsford Smith
28h 35m1 stop San Francisco
$1,179United Airlines
1 day ago
Thu, 3 Dec - Tue, 12 Jan
United Airlines Logo
11:50 - 09:38Sydney  Sydney Kingsford Smith-Ontario Ontario
16h 48m1 stop San Francisco
United Airlines Logo
14:00 - 09:20Ontario  Ontario-Sydney Sydney Kingsford Smith
24h 20m1 stop San Francisco
$1,179United Airlines
1 day ago
Thu, 29 Oct - Thu, 19 Nov
Multiple Airlines Logo
21:40 - 21:29Sydney  Sydney Kingsford Smith-Ontario Ontario
17h 49m1 stop Honolulu
Multiple Airlines Logo
09:55 - 19:45Ontario  Ontario-Sydney Sydney Kingsford Smith
38h 50m1 stop Honolulu
$1,294Multiple Airlines
3+ days ago
Sun, 14 Feb - Fri, 5 Mar
Multiple Airlines Logo
21:40 - 21:28Sydney  Sydney Kingsford Smith-Ontario Ontario
18h 48m1 stop Honolulu
Multiple Airlines Logo
09:00 - 19:45Ontario  Ontario-Sydney Sydney Kingsford Smith
39h 45m1 stop Honolulu
$1,295Multiple Airlines
1 day ago
Booking Insights

Price, demand, and travel trends for flights to Ontario

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

What is the cheapest flight to Ontario?

Sydney to Ontario is the cheapest route at $1,179 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?

On average, a return flight from Australia to Ontario costs $1,361, based on KAYAK data over the past 12 months. Return fares from Sydney average $1,295, while Brisbane runs a bit higher at $1,469.

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

Night flights to Ontario are the cheapest at $1,086 return on average. Morning flights are the most expensive at $1,432.

What is a good deal for flights to Ontario?

Flights under $1,244 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.

Key details for flights to Ontario

Low season

February

Cheapest flight

$640
Beat the crowds with an average 71% drop in traveller numbers.
The most popular month to fly with an average 62% increase in traveller numbers.
One-way flight 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.

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

    A good deal on a flight to Ontario is around $1,244 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.

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

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

  • Which airlines should I consider for flights to Ontario?

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, a good return fare is around $1,244. If you find a fare below that, you're getting a strong deal.
  • If your travel dates are flexible, consider flying to Ontario in December. Return fares historically average $1,062, making December the cheapest month to travel based on KAYAK data from 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 evening to save up to $345 on a return flight. Evening flights to Ontario average $1,086 compared to $1,432 for morning flights.

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 10382 reviews
7.3Comfort
7.1Entertainment
7.7Boarding
6.7Food
8.1Crew
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.

More options for your flight to Ontario