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Everything you should know
Flight Deals
Cheap Flights to Ontario
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights to Ontario 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 return flight deals to Ontario
Thu, 12 Nov - Sun, 15 Nov
21:40 - 22:43Sydney Sydney Kingsford Smith-Ontario Ontario
20h 03m1 stop Honolulu
09:55 - 19:45Ontario Ontario-Sydney Sydney Kingsford Smith
38h 50m1 stop Honolulu
$1,147Multiple Airlines
Tue, 30 Mar - Tue, 6 Apr
11:20 - 09:57Sydney Sydney Kingsford Smith-Ontario Ontario
16h 37m1 stop San Francisco
16:03 - 06:55Ontario Ontario-Sydney Sydney Kingsford Smith
21h 52m1 stop San Francisco
$1,176Virgin Australia
Tue, 19 Jan - Tue, 30 Mar
13:20 - 12:19Sydney Sydney Kingsford Smith-Ontario Ontario
17h 59m1 stop San Francisco
16:03 - 07:55Ontario Ontario-Sydney Sydney Kingsford Smith
21h 52m1 stop San Francisco
$1,176Virgin Australia
Thu, 25 Mar - Tue, 20 Apr
11:50 - 12:20Sydney Sydney Kingsford Smith-Ontario Ontario
18h 30m1 stop San Francisco
18:53 - 06:55Ontario Ontario-Sydney Sydney Kingsford Smith
19h 02m1 stop San Francisco
$1,178United Airlines
Thu, 12 Nov - Sat, 5 Dec
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
13:40 - 06:20Ontario Ontario-Sydney Sydney Kingsford Smith
45h 40m2 stops Denver Intl San Francisco
$1,178United Airlines
Mon, 28 Dec - Mon, 11 Jan
13:20 - 15:19Sydney Sydney Kingsford Smith-Ontario Ontario
20h 59m1 stop San Francisco
15:59 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 21m1 stop San Francisco
$1,178United Airlines
Tue, 23 Mar - Tue, 20 Apr
11:50 - 12:20Sydney Sydney Kingsford Smith-Ontario Ontario
18h 30m1 stop San Francisco
18:53 - 06:55Ontario Ontario-Sydney Sydney Kingsford Smith
19h 02m1 stop San Francisco
$1,178United Airlines
Tue, 17 Nov - Sun, 22 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
16:17 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,178United Airlines
Tue, 10 Nov - Mon, 7 Dec
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
18:40 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
19h 40m1 stop San Francisco
$1,178United Airlines
Thu, 24 Dec - Mon, 11 Jan
13:20 - 17:46Sydney Sydney Kingsford Smith-Ontario Ontario
23h 26m1 stop San Francisco
15:59 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 21m1 stop San Francisco
$1,178United Airlines
Recent one-way flight deals to Ontario
Thu, 25 Feb
09:20 - 21:59Sydney Sydney Kingsford Smith-Ontario Ontario
31h 39m1 stop Houston George Bush Intcntl
$672Lufthansa
Tue, 2 Mar
11:50 - 10:22Sydney Sydney Kingsford Smith-Ontario Ontario
17h 32m1 stop San Francisco
$672Lufthansa
Thu, 4 Mar
11:50 - 12:20Sydney Sydney Kingsford Smith-Ontario Ontario
19h 30m1 stop San Francisco
$672Lufthansa
Tue, 8 Dec
13:20 - 17:36Sydney Sydney Kingsford Smith-Ontario Ontario
23h 16m1 stop San Francisco
$673United Airlines
Thu, 24 Dec
13:20 - 22:53Sydney Sydney Kingsford Smith-Ontario Ontario
28h 33m1 stop San Francisco
$675Virgin Australia
Thu, 19 Nov
11:50 - 20:15Sydney Sydney Kingsford Smith-Ontario Ontario
27h 25m1 stop San Francisco
$676United Airlines
Wed, 20 Jan
13:20 - 12:19Sydney Sydney Kingsford Smith-Ontario Ontario
17h 59m1 stop San Francisco
$676Virgin Australia
Thu, 4 Feb
13:20 - 22:30Sydney Sydney Kingsford Smith-Ontario Ontario
28h 10m1 stop San Francisco
$676Virgin Australia
Tue, 2 Mar
09:15 - 21:59Sydney Sydney Kingsford Smith-Ontario Ontario
31h 44m1 stop Houston George Bush Intcntl
$676Virgin Australia
Tue, 19 Jan
11:50 - 18:03Sydney Sydney Kingsford Smith-Ontario Ontario
25h 13m1 stop San Francisco
$676Virgin Australia
Recent last minute flight deals to Ontario
Mon, 2 Nov - Sun, 15 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
16:17 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,175United Airlines
Tue, 3 Nov - Mon, 30 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
18:37 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
19h 43m1 stop San Francisco
$1,178United Airlines
Mon, 2 Nov - Sun, 15 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
16:17 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,178United Airlines
Wed, 4 Nov - Wed, 11 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
16:17 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,179Virgin Australia
Wed, 4 Nov - Wed, 30 Dec
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
13:05 - 06:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 15m1 stop San Francisco
$1,179Virgin Australia
Mon, 2 Nov - Sun, 15 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
16:17 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,179United Airlines
Mon, 2 Nov - Mon, 9 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
18:37 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
19h 43m1 stop San Francisco
$1,179United Airlines
Mon, 2 Nov - Tue, 17 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
16:17 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,181United Airlines
Mon, 2 Nov - Sun, 15 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
16:17 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,181United Airlines
Sun, 1 Nov - Mon, 30 Nov
11:20 - 13:29Brisbane Brisbane-Ontario Ontario
19h 09m1 stop San Francisco
18:37 - 07:30Ontario Ontario-Brisbane Brisbane
18h 53m1 stop San Francisco
$1,289Virgin Australia
All return flight deals to Ontario
Thu, 12 Nov - Sun, 15 Nov
21:40 - 22:43Sydney Sydney Kingsford Smith-Ontario Ontario
20h 03m1 stop Honolulu
09:55 - 19:45Ontario Ontario-Sydney Sydney Kingsford Smith
38h 50m1 stop Honolulu
$1,147Multiple Airlines
Tue, 30 Mar - Tue, 6 Apr
11:20 - 09:57Sydney Sydney Kingsford Smith-Ontario Ontario
16h 37m1 stop San Francisco
16:03 - 06:55Ontario Ontario-Sydney Sydney Kingsford Smith
21h 52m1 stop San Francisco
$1,176Virgin Australia
Tue, 19 Jan - Tue, 30 Mar
13:20 - 12:19Sydney Sydney Kingsford Smith-Ontario Ontario
17h 59m1 stop San Francisco
16:03 - 07:55Ontario Ontario-Sydney Sydney Kingsford Smith
21h 52m1 stop San Francisco
$1,176Virgin Australia
Thu, 25 Mar - Tue, 20 Apr
11:50 - 12:20Sydney Sydney Kingsford Smith-Ontario Ontario
18h 30m1 stop San Francisco
18:53 - 06:55Ontario Ontario-Sydney Sydney Kingsford Smith
19h 02m1 stop San Francisco
$1,178United Airlines
Thu, 12 Nov - Sat, 5 Dec
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
13:40 - 06:20Ontario Ontario-Sydney Sydney Kingsford Smith
45h 40m2 stops Denver Intl San Francisco
$1,178United Airlines
Mon, 28 Dec - Mon, 11 Jan
13:20 - 15:19Sydney Sydney Kingsford Smith-Ontario Ontario
20h 59m1 stop San Francisco
15:59 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 21m1 stop San Francisco
$1,178United Airlines
Tue, 23 Mar - Tue, 20 Apr
11:50 - 12:20Sydney Sydney Kingsford Smith-Ontario Ontario
18h 30m1 stop San Francisco
18:53 - 06:55Ontario Ontario-Sydney Sydney Kingsford Smith
19h 02m1 stop San Francisco
$1,178United Airlines
Tue, 17 Nov - Sun, 22 Nov
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
16:17 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,178United Airlines
Tue, 10 Nov - Mon, 7 Dec
11:50 - 12:29Sydney Sydney Kingsford Smith-Ontario Ontario
19h 39m1 stop San Francisco
18:40 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
19h 40m1 stop San Francisco
$1,178United Airlines
Thu, 24 Dec - Mon, 11 Jan
13:20 - 17:46Sydney Sydney Kingsford Smith-Ontario Ontario
23h 26m1 stop San Francisco
15:59 - 09:20Ontario Ontario-Sydney Sydney Kingsford Smith
22h 21m1 stop San Francisco
$1,178United Airlines
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.
Prices
Airlines
What is the cheapest flight to Ontario?
Sydney to Ontario is the cheapest route at $1,146 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?
Average and cheapest price for all return flights to Ontario from each origin found by users searching on KAYAK in the last 12 months.On average, a return flight from Australia to Ontario costs $1,343, based on KAYAK data over the past 12 months. Return fares from Sydney average $1,278, while Brisbane runs a bit higher at $1,450.
What is the cheapest time of day to fly to Ontario?
Average price for all return flights depending on time of departure, seen by users on KAYAK in the last 12 months.Night flights to Ontario are the cheapest at $1,073 return on average. Morning flights are the most expensive at $1,414.
What is a good deal for flights to Ontario?
Flights under $1,228 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 $1,112.
Key details for flights to Ontario
Low season | February |
|---|---|
High season | December |
Cheapest flight | $672 |
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
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. The information is for flights to Ontario based on your location. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.
Your questions about flights to Ontario, answered
Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.
Your guide to booking Ontario flights
From booking to airport arrival, find tips to help you plan your flight with more confidence.Reviews of the top airline flying to Ontario
See real verified KAYAK customer reviews for airlines flying to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Australia to Ontario. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
7.3
United AirlinesOverall score based on 10451 reviews
7.7Boarding
8.1Crew
6.7Food
7.3Comfort
7.1Entertainment
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
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
Complete your trip to Ontario with a hotel stay or car hire
Information on the airport you'll fly into in Ontario
Cabin class types available on flights to Ontario
Cabin classes available on flights to Ontario. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
Flights from local origins to Ontario
Flights from all regions of Australia to Ontario. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
Flights from Perth to Ontariofrom $1,834
Flights from Queensland to Ontariofrom $1,286
Flights from Sydney to Ontariofrom $1,146
Flights to other popular destinations
The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.