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Adelaide

$732+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
May 8 — May 151
Fri 5/8
Fri 5/15
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 8, 2026.

This Alaska Airlines deal was found by Cheapflights users on 4/6. 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 8/207:20 am
ONT
-
ADL
2 stops36h 05m
Multiple Airlines
Wed 9/97:10 pm
ADL
-
ONT
2 stops42h 40m
Multiple Airlines
Deal found 4/6$1,218
This Alaska Airlines deal was found by Cheapflights users on 4/7. 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
Thu 10/152:25 pm
ADL
-
ONT
2 stops24h 33m
Multiple Airlines
Deal found 4/7$1,294
This United Airlines deal was found by Cheapflights users on 4/4. 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 5/46:59 pm
ONT
-
ADL
2 stops23h 41m
United Airlines
Mon 5/117:15 am
ADL
-
ONT
2 stops21h 37m
United Airlines
Deal found 4/4$1,586
This United Airlines deal was found by Cheapflights users on 4/8. 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 7/316:39 pm
ONT
-
ADL
2 stops23h 46m
United Airlines
Mon 8/106:40 am
ADL
-
ONT
2 stops22h 02m
United Airlines
Deal found 4/8$1,641
This United Airlines deal was found by Cheapflights users on 4/4. 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 36m
United Airlines
Mon 5/46:00 am
ADL
-
ONT
2 stops20h 11m
United Airlines
Deal found 4/4$1,647
This United Airlines deal was found by Cheapflights users on 4/7. 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 6/56:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Thu 7/96:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 4/7$1,684
This United Airlines deal was found by Cheapflights users on 4/3. 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 7/111:50 pm
ONT
-
ADL
2 stops28h 35m
United Airlines
Mon 7/206:40 am
ADL
-
ONT
2 stops22h 02m
United Airlines
Deal found 4/3$1,876
This United Airlines deal was found by Cheapflights users on 4/6. 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 11/71:33 pm
ONT
-
ADL
2 stops28h 57m
United Airlines
Wed 11/118:40 am
ADL
-
ONT
2 stops22h 10m
United Airlines
Deal found 4/6$1,894
This United Airlines deal was found by Cheapflights users on 4/5. 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 4/126:49 pm
ONT
-
ADL
2 stops23h 46m
United Airlines
Sun 4/196:00 am
ADL
-
ONT
2 stops22h 50m
United Airlines
Deal found 4/5$2,201
This Qatar Airways deal was found by Cheapflights users on 4/4. 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.
Wed 7/1512:04 pm
ONT
-
ADL
2 stops35h 16m
Qatar Airways
Sun 8/29:40 pm
ADL
-
ONT
2 stops39h 26m
Qatar Airways
Deal found 4/4$2,957
This Alaska Airlines deal was found by Cheapflights users on 4/8. 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.
Mon 9/287:20 am
ONT
-
ADL
2 stops22h 45m
Multiple Airlines
Fri 10/92:25 pm
ADL
-
ONT
2 stops24h 33m
Multiple Airlines
Deal found 4/8$7,390
This Alaska Airlines deal was found by Cheapflights users on 4/4. 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 6/39:40 am
ONT
-
ADL
2 stops56h 55m
Multiple Airlines
Mon 7/67:10 pm
ADL
-
ONT
2 stops43h 05m
Multiple Airlines
Deal found 4/4$7,407

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 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,586
(United Airlines)

One-way from

$732
(Alaska Airlines)

Popular in

June

Cheapest in

May

Average price

$1,236
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
High demand for flights, 0% potential price rise
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 8, 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

Thu 8/20

7:20 am-11:55 am

2 stops36h 05m

Adelaide

Wed 9/9

7:10 pm-9:20 pm

2 stops42h 40m

$1,218

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

$1,294

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 5/4

6:59 pm-11:10 am

2 stops23h 41m

Adelaide

Mon 5/11

7:15 am-12:22 pm

2 stops21h 37m

$1,586

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 7/31

6:39 pm-10:55 am

2 stops23h 46m

Adelaide

Mon 8/10

6:40 am-12:12 pm

2 stops22h 02m

$1,641
Quickest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 4/23

6:49 pm-10:55 am

2 stops23h 36m

Adelaide

Mon 5/4

6:00 am-9:41 am

2 stops20h 11m

$1,647

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 6/5

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Thu 7/9

6:05 am-12:12 pm

2 stops22h 37m

$1,684

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 5/7

6:59 pm-11:05 am

2 stops23h 36m

Adelaide

Thu 5/14

6:05 am-12:22 pm

2 stops22h 47m

$1,684

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 7/15

12:04 pm-3:50 pm

2 stops35h 16m

Adelaide

Sun 8/2

9:40 pm-8:36 pm

2 stops39h 26m

$2,957

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 9/28

7:20 am-10:35 pm

2 stops22h 45m

Adelaide

Fri 10/9

2:25 pm-9:28 pm

2 stops24h 33m

$7,390
Cheapest one-way

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 5/15

9:40 am-11:55 am

2 stops57h 45m

$732

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/6

Showing 1-10 of 17 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.

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 $681). Flying from Ontario to Adelaide in June is currently the most expensive (average of $1,080). 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 23h 41m. United Airlines provides one of the quickest options available for as low as $1,586. 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 $681). Flying from Ontario to Adelaide in June is currently the most expensive (average of $1,080). 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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