HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Adelaide

$712+ 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Jun 12 — Jun 191
Fri 6/12
Fri 6/19
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Adelaide with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 May 13, 2026.

This Alaska Airlines deal was found by Cheapflights users on 5/13. 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.
Sat 9/127:20 am
ONT
-
ADL
2 stops22h 45m
Multiple Airlines
Sat 9/1912:40 pm
ADL
-
ONT
2 stops25h 10m
Multiple Airlines
Deal found 5/13$1,226
This United Airlines deal was found by Cheapflights users on 5/12. 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.
Mon 6/226:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Mon 7/276:40 am
ADL
-
ONT
2 stops22h 02m
United Airlines
Deal found 5/12$1,291
This United Airlines deal was found by Cheapflights users on 5/12. 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 5/136:59 pm
ONT
-
ADL
2 stops23h 26m
United Airlines
Sun 5/176:05 am
ADL
-
ONT
2 stops22h 47m
United Airlines
Deal found 5/12$1,298
This United Airlines deal was found by Cheapflights users on 5/11. 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.
Mon 5/116:59 pm
ONT
-
ADL
2 stops23h 26m
United Airlines
Mon 5/186:00 am
ADL
-
ONT
2 stops22h 52m
United Airlines
Deal found 5/11$1,305
This United Airlines deal was found by Cheapflights users on 5/9. 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.
Sun 7/56:39 pm
ONT
-
ADL
2 stops23h 56m
United Airlines
Thu 7/166:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 5/9$1,341
This United Airlines deal was found by Cheapflights users on 5/8. 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.
Thu 10/296:53 pm
ONT
-
ADL
2 stops25h 47m
United Airlines
Sat 11/148:40 am
ADL
-
ONT
2 stops22h 10m
United Airlines
Deal found 5/8$1,391
This United Airlines deal was found by Cheapflights users on 5/12. 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.
Fri 12/111:33 pm
ONT
-
ADL
2 stops28h 57m
United Airlines
Fri 12/257:15 am
ADL
-
ONT
2 stops23h 35m
United Airlines
Deal found 5/12$1,867
This United Airlines deal was found by Cheapflights users on 5/12. 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.
Fri 6/196:39 pm
ONT
-
ADL
2 stops24h 01m
United Airlines
Fri 6/266:40 am
ADL
-
ONT
2 stops22h 02m
United Airlines
Deal found 5/12$1,869
This Qatar Airways deal was found by Cheapflights users on 5/9. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/510:47 am
ONT
-
ADL
2 stops35h 48m
Qatar Airways
Fri 11/2010:00 pm
ADL
-
ONT
2 stops38h 52m
Qatar Airways
Deal found 5/9$1,997
This Qatar Airways deal was found by Cheapflights users on 5/11. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1612:04 pm
ONT
-
ADL
2 stops34h 56m
Qatar Airways
Fri 8/1410:00 pm
ADL
-
ONT
2 stops39h 42m
Qatar Airways
Deal found 5/11$2,622
This Qatar Airways deal was found by Cheapflights users on 5/12. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2410:50 am
ONT
-
ADL
2 stops35h 45m
Qatar Airways
Fri 1/1510:00 pm
ADL
-
ONT
2 stops39h 15m
Qatar Airways
Deal found 5/12$2,628
This United Airlines deal was found by Cheapflights users on 5/8. 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.
Wed 6/36:39 pm
ONT
-
ADL
2 stops23h 46m
United Airlines
Fri 6/266:05 am
ADL
-
ONT
2 stops22h 37m
United Airlines
Deal found 5/8$11,112

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 May 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,226
(Alaska Airlines)

One-way from

$712
(Alaska Airlines)

Popular in

January

Cheapest in

October

Average price

$1,224
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. 9% potential increase in price ($130 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 May 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 May 13, 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 10/22

7:00 am-10:35 pm

2 stops22h 05m

Adelaide

Sat 11/7

2:30 pm-9:32 pm

2 stops25h 32m

$1,226

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 9/12

7:20 am-10:35 pm

2 stops22h 45m

Adelaide

Sat 9/19

12:40 pm-9:20 pm

2 stops25h 10m

$1,226
Quickest round-trip

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 6/22

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Mon 7/27

6:40 am-12:12 pm

2 stops22h 02m

$1,291

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 7/5

6:39 pm-11:05 am

2 stops23h 56m

Adelaide

Thu 7/16

6:05 am-12:12 pm

2 stops22h 37m

$1,341

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 10/29

6:53 pm-2:10 pm

2 stops25h 47m

Adelaide

Sat 11/14

8:40 am-12:20 pm

2 stops22h 10m

$1,391

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Fri 6/19

6:39 pm-11:10 am

2 stops24h 01m

Adelaide

Fri 6/26

6:40 am-12:12 pm

2 stops22h 02m

$1,869

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 11/5

10:47 am-5:05 pm

2 stops35h 48m

Adelaide

Fri 11/20

10:00 pm-6:22 pm

2 stops38h 52m

$1,997

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 7/16

12:04 pm-3:30 pm

2 stops34h 56m

Adelaide

Fri 8/14

10:00 pm-9:12 pm

2 stops39h 42m

$2,622
Cheapest one-way

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 8/20

7:20 am-6:25 pm

2 stops42h 35m

$712
Quickest one-way

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sun 7/19

6:39 pm-11:10 am

2 stops24h 01m

$4,908

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/9

Sorted by cheapest first
  • 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.

  • How long is the flight from Ontario to Adelaide?

    A quick flight from Ontario to Adelaide can take about 23h 56m. United Airlines provides one of the quickest options available for as low as $1,291. 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.

See more FAQs

Traveling to a place near Adelaide?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.