$879 Cheap Flights from Adelaide (ADL) to Ontario (ONT)

View $879 flight on Tue, Jan 13, 2026Opens in a new window

Popular airlines from Adelaide, SA Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT)

Cheap Flights from Adelaide to Ontario (ADL-ONT)

Prices were available within the past 7 days and start at $879 for one-way flights and $3,663 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Qantas Airways
Thu, Jan 8 - Sun, Jan 25
ADL
Adelaide
ONT
Ontario
$3,663 Roundtrip, found 14 hours ago
$3,663
Roundtrip
found 14 hours ago
Select Qantas Airways flight, departing Thu, Jan 8 from Adelaide to Ontario, returning Sun, Jan 25, priced at $3,663 found 14 hours ago
Jetstar
Fri, Jan 9 - Mon, Jan 26
ADL
Adelaide
ONT
Ontario
$3,666 Roundtrip, found 13 hours ago
$3,666
Roundtrip
found 13 hours ago
Select Jetstar flight, departing Fri, Jan 9 from Adelaide to Ontario, returning Mon, Jan 26, priced at $3,666 found 13 hours ago
United
Fri, Jan 9 - Mon, Jan 26
ADL
Adelaide
ONT
Ontario
$3,672 Roundtrip, found 13 hours ago
$3,672
Roundtrip
found 13 hours ago
Select United flight, departing Fri, Jan 9 from Adelaide to Ontario, returning Mon, Jan 26, priced at $3,672 found 13 hours ago
Virgin Australia
Fri, Jan 9 - Mon, Jan 26
ADL
Adelaide
ONT
Ontario
$3,682 Roundtrip, found 13 hours ago
$3,682
Roundtrip
found 13 hours ago
Select Virgin Australia flight, departing Fri, Jan 9 from Adelaide to Ontario, returning Mon, Jan 26, priced at $3,682 found 13 hours ago
Jetstar
Thu, Jan 8 - Fri, Jan 23
ADL
Adelaide
ONT
Ontario
$3,689 Roundtrip, found 6 days ago
$3,689
Roundtrip
found 6 days ago
Select Jetstar flight, departing Thu, Jan 8 from Adelaide to Ontario, returning Fri, Jan 23, priced at $3,689 found 6 days ago
Virgin Australia
Fri, Jan 9 - Mon, Jan 26
ADL
Adelaide
ONT
Ontario
$3,710 Roundtrip, found 13 hours ago
$3,710
Roundtrip
found 13 hours ago
Select Virgin Australia flight, departing Fri, Jan 9 from Adelaide to Ontario, returning Mon, Jan 26, priced at $3,710 found 13 hours ago
Virgin Australia
Fri, Jan 9 - Mon, Jan 26
ADL
Adelaide
ONT
Ontario
$3,727 Roundtrip, found 13 hours ago
$3,727
Roundtrip
found 13 hours ago
Select Virgin Australia flight, departing Fri, Jan 9 from Adelaide to Ontario, returning Mon, Jan 26, priced at $3,727 found 13 hours ago
Qantas Airways
Fri, Jan 9 - Mon, Jan 26
ADL
Adelaide
ONT
Ontario
$3,746 Roundtrip, found 13 hours ago
$3,746
Roundtrip
found 13 hours ago
Select Qantas Airways flight, departing Fri, Jan 9 from Adelaide to Ontario, returning Mon, Jan 26, priced at $3,746 found 13 hours ago
Qantas Airways
Fri, Jan 9 - Mon, Jan 26
ADL
Adelaide
ONT
Ontario
$3,763 Roundtrip, found 13 hours ago
$3,763
Roundtrip
found 13 hours ago
Select Qantas Airways flight, departing Fri, Jan 9 from Adelaide to Ontario, returning Mon, Jan 26, priced at $3,763 found 13 hours ago
Qantas Airways
Thu, Jan 8 - Fri, Jan 23
ADL
Adelaide
ONT
Ontario
$4,254 Roundtrip, found 6 days ago
$4,254
Roundtrip
found 6 days ago
Select Qantas Airways flight, departing Thu, Jan 8 from Adelaide to Ontario, returning Fri, Jan 23, priced at $4,254 found 6 days ago

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to John Wayne SNA. Cheapest option available. Average driving time to city center is 42 minutes. Flights from $7,093
SNA
John Wayne
Cheapest
Average driving time to city center42 min
Flights from $7,093

Frequently asked questions

How much does a flight from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Secure a cheap one-way flight from $879 or cheap return flight from $3,663 from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT)?
The cheapest month to fly from ADL to ONT is January, when demand is low. Off-peak months are often when airlines offer better prices between these airports.
What is the cheapest airline that flies from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from ADL to ONT. Then, sort your results by "Price (lowest to highest)" to pick up the best deal available.
How many flights per day from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT)?
Direct flights from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel details and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from ADL to ONT?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT)?
Opt for a flight from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT) that takes off before 3 PM to reduce the risk of cancellations and delays. Later departures are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Last-minute fares from ADL to ONT are usually more expensive. To lock in the lowest prices, start looking for flights as early as possible. That said, if you're flexible with your travel dates, it's possible to land a cheap fare right before you leave.
Is it cheaper to book an ADL to ONT flight and hotel package?
Compared with arranging hotels and flights separately, booking an ADL to ONT flight and hotel package with Expedia could lead to significant savings. Better still, managing everything in one place takes the hassle out of travel planning. Simply pick your flights and select from our extensive range of stays, then customize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Adelaide Airport (ADL) to Los Angeles - Ontario Intl. Airport (ONT)?
It's generally possible to cancel or reschedule your ADL to ONT flight. However, for bookings made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Travel information

Origin airport
Adelaide
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
United
Roundtrip price
$3,663
Distance
8216 mi

Book with confidence

Book with confidence

Adelaide to Ontario Flights

The cheapest times to fly from Adelaide to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Adelaide to Ontario are during the month of January. You can find some of the cheapest flights from Adelaide to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Adelaide to Ontario

Sunday is one of the best days to book for cheap flights from Adelaide to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Adelaide to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Adelaide to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $879 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Adelaide to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Adelaide to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Adelaide to Ontario Flights

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*Available to One Key members.