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$639+ 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 10/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Aug 31 — Sep 71
Mon 8/31
Mon 9/7
1 adult, Economy
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Find cheap flights from Ontario to Adelaide with Cheapflights

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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 August 1, 2026.

This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 8/199:31 am
ONT
-
ADL
2 stops57h 54m
Multiple Airlines
Sun 8/2311:50 am
ADL
-
ONT
2 stops26h 50m
Multiple Airlines
Deal found 7/29$1,238
This United Airlines deal was found by Cheapflights users on 7/30. 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 9/137:13 pm
ONT
-
ADL
2 stops23h 27m
United Airlines
Sun 9/206:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 7/30$1,278
This United Airlines deal was found by Cheapflights users on 7/28. 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 8/307:13 pm
ONT
-
ADL
2 stops23h 27m
United Airlines
Sun 9/66:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 7/28$1,279
This United Airlines deal was found by Cheapflights users on 8/1. 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 12/54:03 pm
ONT
-
ADL
2 stops29h 47m
United Airlines
Fri 12/118:40 am
ADL
-
ONT
2 stops25h 17m
United Airlines
Deal found 8/1$1,379
This oojo deal was found by Cheapflights users on 7/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2811:13 am
ONT
-
ADL
2 stops35h 47m
Qatar Airways
Tue 11/1710:00 pm
ADL
-
ONT
2 stops38h 58m
Qatar Airways
Deal found 7/30$1,416
This oojo deal was found by Cheapflights users on 7/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1411:13 am
ONT
-
ADL
2 stops35h 17m
Qatar Airways
Wed 10/2110:00 pm
ADL
-
ONT
2 stops43h 12m
Qatar Airways
Deal found 7/28$1,596
This lol.travel deal was found by Cheapflights users on 7/31. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1612:08 pm
ONT
-
ADL
2 stops34h 22m
Qatar Airways
Thu 8/2010:00 pm
ADL
-
ONT
2 stops37h 17m
Qatar Airways
Deal found 7/31$1,916
This oojo deal was found by Cheapflights users on 7/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/18:25 am
ONT
-
ADL
2 stops62h 05m
Qatar Airways
Sat 10/1710:00 pm
ADL
-
ONT
2 stops40h 41m
Qatar Airways
Deal found 7/29$1,995
This oojo deal was found by Cheapflights users on 7/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/16:02 am
ONT
-
ADL
2 stops40h 28m
Qatar Airways
Sat 8/810:00 pm
ADL
-
ONT
2 stops39h 00m
Qatar Airways
Deal found 7/28$2,023
This Qatar Airways deal was found by Cheapflights users on 7/29. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/612:04 pm
ONT
-
ADL
2 stops34h 26m
Qatar Airways
Thu 8/2010:00 pm
ADL
-
ONT
2 stops37h 33m
Qatar Airways
Deal found 7/29$2,192
This United Airlines deal was found by Cheapflights users on 8/1. 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 12/216:27 pm
ONT
-
ADL
2 stops25h 13m
United Airlines
Fri 1/16:00 am
ADL
-
ONT
2 stops24h 45m
United Airlines
Deal found 8/1$3,377

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 August 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,238
(Alaska Airlines)

One-way from

$639
(Alaska Airlines)

Popular in

January

Cheapest in

October

Average price

$1,105
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. 8% potential increase in price ($107 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 August 1, 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

Wed 8/19

9:31 am-11:55 am

2 stops57h 54m

Adelaide

Sun 8/23

11:50 am-10:10 pm

2 stops26h 50m

$1,238

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 8/26

9:31 am-11:55 am

2 stops57h 54m

Adelaide

Wed 9/2

7:10 pm-10:10 pm

2 stops43h 30m

$1,238
Quickest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 9/13

7:13 pm-11:10 am

2 stops23h 27m

Adelaide

Sun 9/20

6:05 am-12:12 pm

2 stops22h 37m

$1,278

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 12/5

4:03 pm-4:20 pm

2 stops29h 47m

Adelaide

Fri 12/11

8:40 am-3:27 pm

2 stops25h 17m

$1,379

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 10/28

11:13 am-4:30 pm

2 stops35h 47m

Adelaide

Tue 11/17

10:00 pm-6:28 pm

2 stops38h 58m

$1,416

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 10/14

11:13 am-4:00 pm

2 stops35h 17m

Adelaide

Wed 10/21

10:00 pm-11:42 pm

2 stops43h 12m

$1,596

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 10/1

8:25 am-3:00 pm

2 stops62h 05m

Adelaide

Sat 10/17

10:00 pm-9:11 pm

2 stops40h 41m

$1,995
Cheapest one-way

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 10/19

7:00 am-6:25 pm

2 stops41h 55m

$639

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 9/8

1:56 pm-6:25 pm

2 stops35h 59m

$648

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 8/30

1:56 pm-11:50 am

2 stops29h 24m

$648

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 18 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.

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