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$825+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ADL
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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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 June 30, 2025.

Round-trip from

$1,709
(United Airlines)

One-way from

$825
(United Airlines)

Popular in

October

Cheapest in

April

Average price

$1,258
From Ontario to Adelaide
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One-way flight from Ontario to Adelaide
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Highest demand for flights based on searches. 2% potential increase in price ($38 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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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 June 30, 2025.

This United Airlines deal was found by Cheapflights users on 6/27. 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 8/196:50 pmONT - ADL
2 stops23h 45mUnited Airlines
Sat 8/236:05 amADL - ONT
2 stops30h 58mUnited Airlines
Deal found 6/27$1,709
This oojo deal was found by Cheapflights users on 6/29. 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.
Tue 7/152:37 pmONT - ADL
2 stops56h 43mQatar Airways
Mon 7/219:40 pmADL - ONT
2 stops43h 05mQatar Airways
Deal found 6/29$3,041

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 June 30, 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

Tue 8/19

6:50 pm-11:05 am

2 stops23h 45m

Adelaide

Sat 8/23

6:05 am-8:33 pm

2 stops30h 58m

$1,709

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Tue 7/15

2:37 pm-3:50 pm

2 stops56h 43m

Adelaide

Mon 7/21

9:40 pm-12:15 am

2 stops43h 05m

$3,041

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Mon 8/11

1:19 pm-11:05 am

2 stops29h 16m

$825

OntarioAdelaide

ONT - ADL

ONTADL

Ontario

Wed 8/13

6:00 am-6:40 am

3 stops56h 10m

$1,336

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

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.

Reviews of airlines servicing Adelaide

Get insights into the airlines that provide service to Adelaide. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Adelaide. Reviews last updated June 30, 2025.
Peruse reviews from past customers who have flown with Qatar Airways, United Airlines, and American Airlines from Ontario to Adelaide to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qatar Airways
7.4
Good
3,596 reviews

Comfort

7.4

Boarding

7.5

Entertainment

7.4

Crew

7.9

Overall

7.4

Food

7.3

Reviews

1 / 20
10.0
Excellent

fa,May 2025

PHL - DOH

The best,the staff was experienced,cheerful, professional,I will use from now on more frequently American airlines
Qatar Airways
7.4
Good
3,596 reviews
Qatar Airways
7.4
Good
3,596 reviews

Comfort

7.4

Boarding

7.5

Entertainment

7.4

Crew

7.9

Overall

7.4

Food

7.3

Reviews

1 / 20
10.0
Excellent

fa,May 2025

PHL - DOH

The best,the staff was experienced,cheerful, professional,I will use from now on more frequently American airlines
United Airlines
7.4
Good
8,852 reviews
Qatar Airways
7.4
Good
3,596 reviews

Comfort

7.4

Boarding

7.5

Entertainment

7.4

Crew

7.9

Overall

7.4

Food

7.3

Reviews

1 / 20
10.0
Excellent

fa,May 2025

PHL - DOH

The best,the staff was experienced,cheerful, professional,I will use from now on more frequently American airlines
American Airlines
7.2
Good
10,000 reviews
Qatar Airways
7.4
Good
3,596 reviews

Comfort

7.4

Boarding

7.5

Entertainment

7.4

Crew

7.9

Overall

7.4

Food

7.3

Reviews

1 / 20
10.0
Excellent

fa,May 2025

PHL - DOH

The best,the staff was experienced,cheerful, professional,I will use from now on more frequently American airlines

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.

  • What are the cheapest airlines to fly from Ontario to Adelaide one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $825. Users have also found prices from $1,336 and $2,621 on Qatar Airways and American Airlines, respectively.

  • 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 Ontario?

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

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