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$734+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
May 24 — May 311
Sun 5/24
Sun 5/31
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 April 24, 2026.

This Alaska Airlines deal was found by Cheapflights users on 4/19. 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.
Sun 8/99:11 am
ONT
-
ADL
2 stops64h 44m
Multiple Airlines
Thu 8/1311:50 am
ADL
-
ONT
2 stops26h 25m
Multiple Airlines
Deal found 4/19$1,241
This Alaska Airlines deal was found by Cheapflights users on 4/22. 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.
Thu 10/17:20 am
ONT
-
ADL
2 stops22h 45m
Multiple Airlines
Sat 10/172:25 pm
ADL
-
ONT
2 stops24h 33m
Multiple Airlines
Deal found 4/22$1,299
This United Airlines deal was found by Cheapflights users on 4/22. 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.
Mon 7/61:50 pm
ONT
-
ADL
2 stops28h 35m
United Airlines
Mon 7/206:40 am
ADL
-
ONT
2 stops22h 02m
United Airlines
Deal found 4/22$1,304
This Alaska Airlines deal was found by Cheapflights users on 4/22. 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.
Tue 5/269:40 am
ONT
-
ADL
2 stops44h 25m
Multiple Airlines
Wed 6/37:10 pm
ADL
-
ONT
2 stops43h 37m
Multiple Airlines
Deal found 4/22$1,316
This United Airlines deal was found by Cheapflights users on 4/21. 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 5/246:39 pm
ONT
-
ADL
2 stops24h 01m
United Airlines
Thu 6/46:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 4/21$1,350
This United Airlines deal was found by Cheapflights users on 4/23. 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 5/286:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Mon 6/18:00 pm
ADL
-
ONT
2 stops32h 42m
United Airlines
Deal found 4/23$1,354
This Alaska Airlines deal was found by Cheapflights users on 4/22. 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.
Thu 5/219:40 am
ONT
-
ADL
2 stops44h 25m
Multiple Airlines
Sat 6/62:25 pm
ADL
-
ONT
2 stops24h 22m
Multiple Airlines
Deal found 4/22$1,391
This United Airlines deal was found by Cheapflights users on 4/21. 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 5/226:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Fri 5/296:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 4/21$1,397
This United Airlines deal was found by Cheapflights users on 4/21. 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 5/231:40 pm
ONT
-
ADL
2 stops28h 45m
United Airlines
Thu 6/46:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 4/21$1,404
This United Airlines deal was found by Cheapflights users on 4/19. 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 12/235:00 am
ONT
-
ADL
2 stops58h 00m
United Airlines
Sat 1/3012:45 pm
ADL
-
ONT
2 stops47h 32m
United Airlines
Deal found 4/19$1,885
This United Airlines deal was found by Cheapflights users on 4/20. 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 5/276:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Sat 6/276:05 am
ADL
-
ONT
2 stops25h 54m
United Airlines
Deal found 4/20$2,093

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 April 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,241
(Alaska Airlines)

One-way from

$734
(Alaska Airlines)

Popular in

June

Cheapest in

May

Average price

$1,271
Provider with most accurate pricing for Ontario-Adelaide flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-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. 0% potential increase in price ($1 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 April 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 April 24, 2026.
Use the filters below to find and compare flights from Ontario to Adelaide that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 8/9

9:11 am-6:25 pm

2 stops64h 44m

Adelaide

Thu 8/13

11:50 am-9:45 pm

2 stops26h 25m

$1,241

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 5/19

9:40 am-10:35 pm

2 stops44h 25m

Adelaide

Tue 5/26

6:00 am-10:17 pm

2 stops32h 47m

$1,241

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 10/1

7:20 am-10:35 pm

2 stops22h 45m

Adelaide

Sat 10/17

2:25 pm-9:28 pm

2 stops24h 33m

$1,299

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 10/1

7:20 am-10:35 pm

2 stops22h 45m

Adelaide

Thu 10/15

2:25 pm-9:28 pm

2 stops24h 33m

$1,299

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 7/6

1:50 pm-10:55 am

2 stops28h 35m

Adelaide

Mon 7/20

6:40 am-12:12 pm

2 stops22h 02m

$1,304

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 7/29

9:11 am-4:25 pm

2 stops62h 44m

Adelaide

Wed 8/12

7:10 pm-9:45 pm

2 stops43h 05m

$1,316

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 5/24

6:39 pm-11:10 am

2 stops24h 01m

Adelaide

Thu 6/4

6:05 am-12:12 pm

2 stops22h 37m

$1,350

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 5/28

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Mon 6/1

8:00 pm-12:12 pm

2 stops32h 42m

$1,354

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 5/27

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Sat 6/27

6:05 am-3:29 pm

2 stops25h 54m

$2,093
Quickest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 5/23

6:39 pm-10:55 am

2 stops23h 46m

Adelaide

Sat 5/30

6:05 am-12:12 pm

2 stops22h 37m

$2,173

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/20

Showing 1-10 of 12 resultsSorted by cheapest first
1
2
  • Most accurate provider: When it comes to deals on Ontario-Adelaide flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Adelaide flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Adelaide flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Adelaide flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Adelaide flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

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.

  • 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.

Traveling to a place near Adelaide?

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

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