HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Adelaide

$653+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
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 December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/16. 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 12/306:39 pmONT - ADL
2 stops25h 01mUnited Airlines
Wed 1/72:55 pmADL - ONT
1 stop26h 28mUnited Airlines
Deal found 12/16$1,383
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/3010:42 amONT - ADL
2 stops32h 58mUnited Airlines
Sat 1/102:55 pmADL - ONT
1 stop26h 28mUnited Airlines
Deal found 12/16$1,386
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/306:39 pmONT - ADL
2 stops25h 01mUnited Airlines
Fri 1/96:00 amADL - ONT
2 stops30h 13mUnited Airlines
Deal found 12/16$1,400
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/3110:42 amONT - ADL
2 stops52h 48mUnited Airlines
Sat 1/102:55 pmADL - ONT
2 stops40h 22mUnited Airlines
Deal found 12/16$1,407
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/3110:42 amONT - ADL
2 stops52h 48mUnited Airlines
Fri 1/96:00 amADL - ONT
3 stops48h 47mUnited Airlines
Deal found 12/16$1,416
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/306:39 pmONT - ADL
2 stops25h 01mUnited Airlines
Tue 1/69:30 amADL - ONT
2 stops54h 58mUnited Airlines
Deal found 12/16$1,818
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/306:39 pmONT - ADL
2 stops25h 01mUnited Airlines
Mon 1/57:15 amADL - ONT
2 stops28h 58mUnited Airlines
Deal found 12/16$2,085
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/306:39 pmONT - ADL
2 stops25h 01mUnited Airlines
Sun 1/46:00 amADL - ONT
2 stops34h 22mUnited Airlines
Deal found 12/16$2,222
This Qatar Airways deal was found by Cheapflights users on 12/16. 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 12/316:00 amONT - ADL
2 stops40h 35mQatar Airways
Wed 1/75:50 pmADL - ONT
3 stops48h 36mQatar Airways
Deal found 12/16$4,396

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,128
(Alaska Airlines)

One-way from

$653
(United Airlines)

Popular in

January

Cheapest in

July

Average price

$1,398
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. 12% potential increase in price ($171 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 18, 2025.
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

Wed 2/11

8:13 am-10:55 am

2 stops56h 12m

Adelaide

Fri 5/15

12:40 pm-9:27 pm

2 stops25h 17m

$1,128

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 2/12

8:41 am-10:55 am

2 stops55h 44m

Adelaide

Thu 5/14

7:10 pm-9:27 pm

2 stops42h 47m

$1,128

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 2/11

8:13 am-1:45 pm

2 stops59h 02m

Adelaide

Sat 5/16

8:50 am-9:27 pm

2 stops29h 07m

$1,128

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 2/11

8:13 am-8:15 am

2 stops53h 32m

Adelaide

Thu 5/14

7:10 pm-9:27 pm

2 stops42h 47m

$1,128

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 2/11

8:13 am-4:25 pm

2 stops61h 42m

Adelaide

Sun 5/17

8:50 am-9:27 pm

2 stops29h 07m

$1,128

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 2/12

8:41 am-4:25 pm

2 stops61h 14m

Adelaide

Sat 5/16

12:40 pm-9:27 pm

2 stops25h 17m

$1,128

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 2/26

6:37 pm-9:30 am

1 stop20h 23m

$653

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Sat 2/7

6:10 am-9:30 am

2 stops32h 50m

$653

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 1/29

6:39 pm-9:30 am

1 stop20h 21m

$678

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Thu 1/1

10:42 am-9:30 am

1 stop28h 18m

$682

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 11 results
1
2

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 $686). Flying from Ontario to Adelaide in June is currently the most expensive (average of $1,122). 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.

  • 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 $686). Flying from Ontario to Adelaide in June is currently the most expensive (average of $1,122). 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

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.