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Cheap flights from Sydney to Illinois from $772

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
18 Jun — 25 Jun1
1 adult

Cheap flight deals from Sydney to Illinois

Keep the following information in mind while searching for Sydney to Illinois flight deals. Data was last updated 13 June 2025.

Round-trip from

$1,606

One-way from

$772

Popular in

December

Cheapest in

March

Average price

$1,669
14/8-4/9
  • 14/8-4/9
  • 4 total stops
  • 63h 26m total
  • Sydney to Illinois
Search Deals
23/8
  • 23/8
  • 2 total stops
  • 24h 21m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($588 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($123 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

Find flight deals from Sydney to Illinois

Cheapest flights from Sydney to Illinois
Explore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 June 2025.

Tue 21/1010:20SYD - STL
2 stops44h 58mMultiple Airlines
Tue 11/1116:43STL - SYD
2 stops23h 52mMultiple Airlines
Deal found 12/6$1,601
Thu 14/813:15SYD - ORD
2 stops24h 31mMultiple Airlines
Thu 4/906:20ORD - SYD
2 stops38h 55mMultiple Airlines
Deal found 12/6$1,606
Mon 21/709:25SYD - MDW
2 stops23h 37mDelta
Sun 17/810:11MDW - SYD
2 stops29h 24mDelta
Deal found 12/6$1,678
Mon 21/709:25SYD - ORD
2 stops25h 02mDelta
Sun 17/815:50ORD - SYD
2 stops23h 45mDelta
Deal found 12/6$1,678
Mon 18/817:45SYD - STL
2 stops45h 31mAmerican Airlines
Sat 8/1113:55STL - SYD
1 stop24h 00mAmerican Airlines
Deal found 12/6$1,679
Fri 13/620:55SYD - ORD
1 stop26h 45mANA
Thu 31/709:05ORD - SYD
2 stops43h 10mANA
Deal found 12/6$1,686
Mon 18/809:25SYD - STL
2 stops28h 49mDelta
Sat 8/1112:10STL - SYD
2 stops27h 25mDelta
Deal found 12/6$1,706
Mon 18/810:20SYD - STL
1 stop21h 25mUnited Airlines
Sat 8/1111:10STL - SYD
1 stop26h 50mUnited Airlines
Deal found 11/6$1,733
Mon 4/809:10SYD - ORD
1 stop23h 32mAmerican Airlines
Mon 25/806:00ORD - SYD
1 stop34h 05mAmerican Airlines
Deal found 12/6$1,733
Tue 21/1010:10SYD - STL
1 stop28h 43mQantas Airways
Tue 11/1106:15STL - SYD
1 stop33h 45mQantas Airways
Deal found 12/6$1,735
Wed 23/708:55SYD - ORD
2 stops29h 48mJapan Airlines
Tue 19/801:30ORD - SYD
1 stop37h 50mJapan Airlines
Deal found 12/6$1,868
Thu 17/709:10SYD - ORD
1 stop21h 34mBritish Airways
Mon 28/722:17ORD - SYD
1 stop41h 48mBritish Airways
Deal found 9/6$1,891

Cheapflights Fare Finder

Customise your flight search to find flights from Sydney to Illinois 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 13 June 2025.
Use the filters below to find and compare flights from Sydney to Illinois that are best for you.

Fly from

Sydney

Fly to

Illinois

Route

Depart

Return

Price

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 14/8

13:15-22:46

2 stops24h 31m

Chicago O'Hare Intl

Thu 4/9

06:20-12:15

2 stops38h 55m

$1,606

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Mon 21/7

09:25-18:02

2 stops23h 37m

Chicago Midway

Sun 17/8

10:11-06:35

2 stops29h 24m

$1,678

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 21/7

09:25-19:27

2 stops25h 02m

Chicago O'Hare Intl

Sun 17/8

15:50-06:35

2 stops23h 45m

$1,678

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

17:45-00:16

2 stops45h 31m

Lambert-St Louis

Sat 8/11

13:55-06:55

1 stop24h 00m

$1,679

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

09:25-23:14

2 stops28h 49m

Lambert-St Louis

Sat 8/11

12:10-08:35

2 stops27h 25m

$1,706

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 4/8

20:55-08:40

1 stop26h 45m

Chicago O'Hare Intl

Mon 25/8

20:20-19:15

2 stops31h 55m

$1,712

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

09:30-16:31

2 stops22h 01m

Lambert-St Louis

Sat 8/11

16:35-07:00

1 stop21h 25m

$1,733

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 4/8

09:10-17:42

1 stop23h 32m

Chicago O'Hare Intl

Mon 25/8

06:00-07:05

1 stop34h 05m

$1,733

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 23/7

08:55-23:43

2 stops29h 48m

Chicago O'Hare Intl

Tue 19/8

01:30-06:20

1 stop37h 50m

$1,868

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 18/7

17:45-23:30

1 stop20h 45m

Lambert-St Louis

Thu 31/7

06:14-07:05

1 stop33h 51m

$1,963

Flights are sorted by cheapest return flights first.

Deals found on 11/6

Showing 1-10 of 29 results
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Best time to book a flight from Sydney to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Sydney 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 Sydney to Illinois

What is the cheapest time of day to fly from SYD to IL?

Find hourly flight availability from Sydney to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 13 June 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Sydney to Illinois as you normally would.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 inches per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated 13 June 2025.
To help decide which airline to fly from Sydney to Illinois, see what other customers have to say about Air Tahiti Nui, Korean Air and Japan Airlines. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Overall

8.7

Entertainment

7.3

Food

7.8

Boarding

8.7

Comfort

8.1

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Air Tahiti Nui
8.7
Very Good
64 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Overall

8.7

Entertainment

7.3

Food

7.8

Boarding

8.7

Comfort

8.1

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Korean Air
8.4
Very Good
1,091 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Overall

8.7

Entertainment

7.3

Food

7.8

Boarding

8.7

Comfort

8.1

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Japan Airlines
8.3
Very Good
1,490 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Overall

8.7

Entertainment

7.3

Food

7.8

Boarding

8.7

Comfort

8.1

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
ANA
8.3
Very Good
882 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Overall

8.7

Entertainment

7.3

Food

7.8

Boarding

8.7

Comfort

8.1

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Delta
8.0
Very Good
7,950 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Overall

8.7

Entertainment

7.3

Food

7.8

Boarding

8.7

Comfort

8.1

Crew

9.0

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

Related info for your journey

Find useful and relevant information for your journey from Sydney to Illinois. 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 from for flights from Sydney to Illinois?

    If you book a flight to Illinois from Sydney, you will be flying from Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 7.5 km from the centre of Sydney.

  • What are the cheapest airlines to fly from Sydney to Illinois one-way?

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $1,174. However, be on the lookout for offers from Delta and Air Tahiti Nui, as they are both options that can get you from Sydney to Illinois for a low price.

  • What are the most popular routes from Sydney to Illinois?

    The most popular route from Sydney to Illinois is Sydney Kingsford Smith - Chicago O'Hare Intl. You may also consider Sydney Kingsford Smith - Chicago Midway or Sydney Kingsford Smith - Lambert-St Louis.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Sydney to Illinois 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

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Alternative routes for Sydney to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Sydney to Illinois

Discover the top 6 airlines that operate flights from Sydney to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 13 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,016Average$1,277FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
American AirlinesCheapest$1,197Average$1,602FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapest$1,277Average$1,717FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
ANACheapest$1,612Average$1,810FlexibilityNo cancel feeOn-time80%
Search ANA flights
United AirlinesCheapest$1,695Average$2,469FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AustraliaCheapest$1,769Average$2,797FlexibilityNo cancel feeOn-time80%
Search Virgin Australia flights

Fly with Cheapflights

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

When you search for this flight from Sydney to Illinois, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Sydney to Illinois.

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

Yes! Cheapflights helps users easily find flights from Sydney to Illinois with no change fees.

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Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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