HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Adelaide

$818+ 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 1/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
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

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 agosto 14, 2025.

Round-trip from

$1,517
(United Airlines)

One-way from

$818
(United Airlines)

Popular in

December

Cheapest in

July

Average price

$1,078
From Ontario to Adelaide
Search Deals
One-way flight from Ontario to Adelaide
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($150 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find 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 agosto 14, 2025.

This United Airlines deal was found by Cheapflights users on 8/12. 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.
lun. 9/226:50 pmONT - ADL
2 stops23h 35mUnited Airlines
mar. 9/306:00 amADL - ONT
2 stops22h 43mUnited Airlines
Deal found 8/12$1,517
This United Airlines deal was found by Cheapflights users on 8/12. 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.
jue. 12/256:39 pmONT - ADL
1 stop20h 21mUnited Airlines
lun. 1/52:55 pmADL - ONT
1 stop21h 18mUnited Airlines
Deal found 8/12$1,562
This United Airlines deal was found by Cheapflights users on 8/12. 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.
jue. 9/116:50 pmONT - ADL
2 stops23h 45mUnited Airlines
jue. 9/186:05 amADL - ONT
2 stops22h 38mUnited Airlines
Deal found 8/12$1,604
This United Airlines deal was found by Cheapflights users on 8/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/126:50 pmONT - ADL
2 stops23h 35mUnited Airlines
vie. 9/196:00 amADL - ONT
2 stops22h 43mUnited Airlines
Deal found 8/13$1,617
This United Airlines deal was found by Cheapflights users on 8/11. 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.
sáb. 9/206:50 pmONT - ADL
2 stops23h 35mUnited Airlines
sáb. 10/46:00 amADL - ONT
2 stops22h 43mUnited Airlines
Deal found 8/11$1,642
This United Airlines deal was found by Cheapflights users on 8/12. 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.
mié. 11/126:05 amONT - ADL
2 stops34h 20mUnited Airlines
lun. 11/246:10 amADL - ONT
2 stops24h 57mUnited Airlines
Deal found 8/12$1,669
This United Airlines deal was found by Cheapflights users on 8/12. 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.
mié. 8/136:39 pmONT - ADL
2 stops23h 46mUnited Airlines
mié. 8/206:00 amADL - ONT
2 stops22h 43mUnited Airlines
Deal found 8/12$1,672
This United Airlines deal was found by Cheapflights users on 8/12. 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.
lun. 9/226:50 pmONT - ADL
2 stops23h 35mUnited Airlines
vie. 10/36:50 pmADL - ONT
2 stops33h 53mUnited Airlines
Deal found 8/12$1,722
This United Airlines deal was found by Cheapflights users on 8/12. 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.
lun. 9/156:50 pmONT - ADL
2 stops23h 45mUnited Airlines
sáb. 9/206:00 amADL - ONT
2 stops22h 43mUnited Airlines
Deal found 8/12$1,750
This United Airlines deal was found by Cheapflights users on 8/12. 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.
jue. 12/2510:42 amONT - ADL
1 stop28h 18mUnited Airlines
sáb. 1/32:55 pmADL - ONT
1 stop21h 18mUnited Airlines
Deal found 8/12$1,863
This United Airlines deal was found by Cheapflights users on 8/11. 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.
mar. 8/196:50 pmONT - ADL
2 stops23h 45mUnited Airlines
sáb. 8/234:30 pmADL - ONT
2 stops36h 13mUnited Airlines
Deal found 8/11$1,866
This United Airlines deal was found by Cheapflights users on 8/12. 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.
mar. 12/2311:59 pmONT - ADL
2 stops63h 01mUnited Airlines
lun. 1/52:55 pmADL - ONT
1 stop26h 16mUnited Airlines
Deal found 8/12$1,923

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 agosto 14, 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

dom. 9/28

6:36 pm-10:55 am

2 stops23h 49m

Adelaide

dom. 10/5

6:00 am-12:13 pm

2 stops23h 43m

$1,517

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

lun. 9/22

6:50 pm-10:55 am

2 stops23h 35m

Adelaide

mar. 9/30

6:00 am-12:13 pm

2 stops22h 43m

$1,517

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

jue. 12/25

6:39 pm-9:30 am

1 stop20h 21m

Adelaide

lun. 1/5

2:55 pm-5:43 pm

1 stop21h 18m

$1,562

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

jue. 9/11

6:50 pm-11:05 am

2 stops23h 45m

Adelaide

jue. 9/18

6:05 am-12:13 pm

2 stops22h 38m

$1,604

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

vie. 9/12

6:50 pm-10:55 am

2 stops23h 35m

Adelaide

vie. 9/19

6:00 am-12:13 pm

2 stops22h 43m

$1,617

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

sáb. 9/20

6:50 pm-10:55 am

2 stops23h 35m

Adelaide

sáb. 10/4

6:00 am-12:13 pm

2 stops22h 43m

$1,642

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

mié. 11/12

6:05 am-10:55 am

2 stops34h 20m

Adelaide

lun. 11/24

6:10 am-12:37 pm

2 stops24h 57m

$1,669

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

lun. 9/22

6:50 pm-10:55 am

2 stops23h 35m

Adelaide

vie. 10/3

6:50 pm-12:13 pm

2 stops33h 53m

$1,722

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

lun. 9/15

6:50 pm-11:05 am

2 stops23h 45m

Adelaide

sáb. 9/20

6:00 am-12:13 pm

2 stops22h 43m

$1,750

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

jue. 12/25

10:42 am-9:30 am

1 stop28h 18m

Adelaide

sáb. 1/3

2:55 pm-5:43 pm

1 stop21h 18m

$1,863

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 20 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, August is the cheapest month in which you can book a flight from Ontario to Adelaide (average of $1,214). Flying from Ontario to Adelaide in December is currently the most expensive (average of $2,057). 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, August is the cheapest month in which you can book a flight from Ontario to Adelaide (average of $1,214). Flying from Ontario to Adelaide in December is currently the most expensive (average of $2,057). 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.