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$682+ Cheap flights from Ontario (ONT) to Adelaide (ADL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Mar 14 — Mar 211
Sat 3/14
Sat 3/21
1 adult, Economy
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Cheap flight deals from Ontario to Adelaide

Cheapest flights from Ontario to Adelaide
Explore the most affordable flight options available from Ontario to Adelaide. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 12, 2026.

This Alaska Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:00 am
ONT
-
ADL
2 stops42h 35m
Multiple Airlines
Wed 9/167:10 pm
ADL
-
ONT
2 stops42h 48m
Multiple Airlines
Deal found 2/11$1,196
This United Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/146:37 pm
ONT
-
ADL
1 stop20h 23m
United Airlines
Sat 3/212:15 pm
ADL
-
ONT
1 stop26h 12m
United Airlines
Deal found 2/11$1,271
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/11:50 pm
ONT
-
ADL
2 stops29h 50m
United Airlines
Sun 3/158:30 am
ADL
-
ONT
2 stops21h 18m
United Airlines
Deal found 2/10$1,439
This United Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:37 pm
ONT
-
ADL
2 stops24h 53m
United Airlines
Sat 8/86:05 am
ADL
-
ONT
2 stops22h 45m
United Airlines
Deal found 2/11$1,489
This United Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/236:49 pm
ONT
-
ADL
2 stops23h 46m
United Airlines
Sun 5/36:05 am
ADL
-
ONT
2 stops22h 47m
United Airlines
Deal found 2/12$1,590
This United Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/16:53 pm
ONT
-
ADL
2 stops23h 47m
United Airlines
Fri 7/106:40 am
ADL
-
ONT
2 stops22h 10m
United Airlines
Deal found 2/12$1,618
This United Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/86:37 pm
ONT
-
ADL
2 stops22h 48m
United Airlines
Wed 3/112:15 pm
ADL
-
ONT
1 stop26h 12m
United Airlines
Deal found 2/12$1,639
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/126:53 pm
ONT
-
ADL
2 stops23h 42m
United Airlines
Sun 6/286:05 am
ADL
-
ONT
2 stops22h 45m
United Airlines
Deal found 2/9$1,712
This United Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/146:53 pm
ONT
-
ADL
2 stops23h 32m
United Airlines
Tue 7/286:05 am
ADL
-
ONT
2 stops22h 45m
United Airlines
Deal found 2/11$1,771

Find flight deals from Ontario to Adelaide

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Adelaide (ADL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,271
(United Airlines)

One-way from

$682
(Alaska Airlines)

Popular in

January

Cheapest in

May

Average price

$1,078
Provider with most accurate pricing for Los Angeles-Adelaide flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Adelaide flights.
Search Deals
From Ontario to Adelaide
Search Deals
One-way flight from Ontario to Adelaide
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($180 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Adelaide that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 12, 2026.
Use the filters below to find and compare flights from Ontario to Adelaide that are best for you.

Fly from

Ontario

Fly to

Adelaide

Route

Depart

Return

Price

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 3/19

6:37 pm-9:20 am

1 stop21h 13m

Adelaide

Sat 3/28

2:15 pm-5:35 pm

1 stop20h 50m

$1,271

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 3/14

1:50 pm-8:30 am

2 stops25h 10m

Adelaide

Sat 3/21

2:15 pm-5:38 pm

1 stop20h 53m

$1,275

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 3/1

1:50 pm-2:10 pm

2 stops29h 50m

Adelaide

Sun 3/15

8:30 am-12:18 pm

2 stops21h 18m

$1,439

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 3/25

6:37 pm-1:00 pm

2 stops24h 53m

Adelaide

Sat 8/8

6:05 am-12:20 pm

2 stops22h 45m

$1,489

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 4/23

6:49 pm-11:05 am

2 stops23h 46m

Adelaide

Sun 5/3

6:05 am-12:22 pm

2 stops22h 47m

$1,590

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 3/8

6:37 pm-10:55 am

2 stops22h 48m

Adelaide

Wed 3/11

2:15 pm-10:57 pm

1 stop26h 12m

$1,639

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 6/12

6:53 pm-11:05 am

2 stops23h 42m

Adelaide

Sun 6/28

6:05 am-12:20 pm

2 stops22h 45m

$1,712

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 7/14

6:53 pm-10:55 am

2 stops23h 32m

Adelaide

Tue 7/28

6:05 am-12:20 pm

2 stops22h 45m

$1,771

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 2/24

8:41 am-8:15 am

2 stops53h 04m

$682

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 2/25

8:41 am-8:15 am

2 stops53h 04m

$683

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

Showing 1-10 of 19 results
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Best time to book a flight from Ontario to Adelaide

Have a flexible travel schedule? Discover the best time to fly to Adelaide from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Adelaide

What is the cheapest month to book a flight from Ontario to Adelaide?

Currently, February is the cheapest month in which you can book a flight from Ontario to Adelaide (average of $694). Flying from Ontario to Adelaide in June is currently the most expensive (average of $1,115). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Adelaide. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Adelaide?

    A quick flight from Ontario to Adelaide can take about 21h 13m. United Airlines provides one of the quickest options available for as low as $1,271. The distance from Ontario to Adelaide is about 8211 mi.

  • Can I find deals for flights from Ontario to Adelaide that include hotel bookings?

    Yes. In addition to deals on Ontario to Adelaide flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Adelaide?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Adelaide.

  • Can I find deals for business class flights from Ontario to Adelaide?

    Yes. Cheapflights offers flight deals from Ontario to Adelaide by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Adelaide?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Adelaide (average of $694). Flying from Ontario to Adelaide in June is currently the most expensive (average of $1,115). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Adelaide?

Book flights to Adelaide if you plan to visit one of these locations
Glenelg

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