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Cheap flights from Illinois to Adelaide from $791

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 25/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ADL
28 Feb — 7 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Illinois to Adelaide

Enter your travel dates to find the best prices.

Cheapest flights from Illinois to Adelaide
Explore the most affordable flight options available from Illinois to Adelaide. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 January 2026.

Mon 4/515:40
ORD
-
ADL
2 stops29h 40m
Multiple Airlines
Thu 14/518:55
ADL
-
ORD
2 stops34h 20m
Multiple Airlines
Deal found 27/1$1,492
Mon 4/514:15
ORD
-
ADL
3 stops31h 05m
Air Canada
Thu 14/518:55
ADL
-
ORD
2 stops34h 20m
Air Canada
Deal found 27/1$1,511
Sun 15/315:35
ORD
-
ADL
2 stops30h 50m
Air Canada
Sun 22/321:45
ADL
-
ORD
2 stops37h 45m
Air Canada
Deal found 28/1$1,528
Sat 14/314:58
ORD
-
ADL
2 stops26h 57m
Qantas Airways
Sat 21/306:05
ADL
-
ORD
2 stops33h 20m
Qantas Airways
Deal found 28/1$1,636
Sat 14/318:25
ORD
-
ADL
3 stops57h 15m
Air Canada
Sat 21/318:55
ADL
-
ORD
2 stops35h 16m
Air Canada
Deal found 28/1$1,685
Sun 8/215:35
ORD
-
ADL
2 stops38h 25m
Air Canada
Thu 12/206:00
ADL
-
ORD
2 stops27h 08m
Air Canada
Deal found 26/1$1,742
Sat 14/316:35
ORD
-
ADL
1 stop24h 25m
United Airlines
Sat 21/314:15
ADL
-
ORD
1 stop21h 07m
United Airlines
Deal found 28/1$1,810
Thu 12/208:59
ORD
-
ADL
3 stops34h 46m
Multiple Airlines
Thu 19/213:15
ADL
-
ORD
3 stops35h 09m
Multiple Airlines
Deal found 27/1$1,816

Find flight deals from Illinois to Adelaide

Keep the following information in mind while searching for Illinois to Adelaide flight deals. Data was last updated 29 January 2026.

Round-trip from

$1,492

One-way from

$791

Popular in

September

Cheapest in

February

Average price

$1,662
4/5-14/5
  • 4/5-14/5
  • 4 total stops
  • 64h 00m total
  • Illinois to Adelaide
Search Deals
25/3
  • 25/3
  • 2 total stops
  • 48h 20m total
  • Illinois to Adelaide
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($374 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($68 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Illinois 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 647,157 searches. Data last updated 29 January 2026.
Use the filters below to find and compare flights from Illinois to Adelaide that are best for you.

Fly from

Illinois

Fly to

Adelaide

Route

Depart

Return

Price

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Mon 4/5

14:15-11:50

3 stops31h 05m

Adelaide

Thu 14/5

18:55-14:45

2 stops34h 20m

$1,511

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Sun 15/3

15:35-13:55

2 stops30h 50m

Adelaide

Sun 22/3

21:45-20:00

2 stops37h 45m

$1,528

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Sat 14/3

14:58-09:25

2 stops26h 57m

Adelaide

Sat 21/3

06:05-23:55

2 stops33h 20m

$1,636

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Sat 14/3

18:25-19:10

3 stops57h 15m

Adelaide

Sat 21/3

18:55-14:41

2 stops35h 16m

$1,685

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Sun 8/2

15:35-22:30

2 stops38h 25m

Adelaide

Thu 12/2

06:00-16:38

2 stops27h 08m

$1,742

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Sat 14/3

16:35-08:30

1 stop24h 25m

Adelaide

Sat 21/3

14:15-19:52

1 stop21h 07m

$1,810

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Thu 12/2

08:59-12:15

3 stops34h 46m

Adelaide

Thu 19/2

13:15-07:54

3 stops35h 09m

$1,816

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Wed 25/3

15:35-07:25

2 stops48h 20m

$791

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Sun 15/2

14:35-06:15

2 stops47h 10m

$915

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Sat 21/3

18:01-20:25

3 stops58h 54m

$1,048

Flights are sorted by cheapest return flights first.

Deals found on 27/1

Showing 1-10 of 12 results
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Best time to book a flight from Illinois to Adelaide

Have a flexible travel schedule? Discover the best time to fly to Adelaide from Illinois with our price prediction graph.
Estimated return 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 Illinois to Adelaide

How much does it cost for a return flight from Illinois to Adelaide?

Related info for your journey

Find useful and relevant information for your journey from Illinois to Adelaide. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Adelaide from Illinois?

    Adelaide (ADL) is the airport you will fly into if you book a flight from Illinois to Adelaide. It is only a 6.6 km journey from Adelaide (ADL) to Adelaide’s city centre.

  • How long is the flight from Illinois to Adelaide?

    A quick flight from Illinois to Adelaide can take about 26h 57m. Air Canada provides one of the quickest options available for as low as $1,636. Illinois and Adelaide are separated by a distance of 15937 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • Can I find deals for flights from Illinois to Adelaide that include hotel bookings?

    Yes. In addition to deals on Illinois to Adelaide flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Adelaide?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Adelaide.

  • Can I find deals for business class flights from Illinois to Adelaide?

    Yes. Cheapflights offers flight deals from Illinois 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

Travelling to a place near Adelaide?

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

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How does Cheapflights help users find flights from Illinois to Adelaide?

Deals for Illinois to Adelaide flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Illinois to Adelaide?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Adelaide from Illinois.

Can Cheapflights find flights from Illinois to Adelaide with no change fees?

Need flexible booking options for your flight to Adelaide from Illinois? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Illinois to Adelaide become cheaper?

Yes! Start tracking prices for Illinois to Adelaide flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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