HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$482+ Cheap flights from Sydney (SYD) to Illinois

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 5/21. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
may. 6 — may. 131
mar. 5/6
mar. 5/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Sydney to Illinois 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 Sydney to Illinois

Keep the following information in mind while searching for Sydney to Illinois flight deals. Data was last updated mayo 1, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$997
(Trip.com)

One-way from

$532
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$996
Provider with most accurate pricing for Sydney Kingsford Smith-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sydney Kingsford Smith-Chicago (CHI) flights.
Search Deals
From Sydney Kingsford Smith to Illinois
Search Deals
One-way flight from Sydney Kingsford Smith to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($208 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 mayo 1, 2025.

This Trip.com deal was found by Cheapflights users on 4/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 6/51:15 pmSYD - ORD
2 stops24h 40mMultiple Airlines
lun. 6/236:10 amORD - SYD
2 stops38h 35mMultiple Airlines
Deal found 4/29$997
This FlightHub deal was found by Cheapflights users on 4/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/1111:50 amSYD - ORD
1 stop35h 50mANA
lun. 9/158:20 pmORD - SYD
2 stops31h 55mANA
Deal found 4/29$1,093
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 6/249:10 amSYD - ORD
2 stops24h 25mAmerican Airlines
mar. 7/294:39 pmORD - SYD
2 stops23h 26mAmerican Airlines
Deal found 4/29$1,195
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/189:25 amSYD - STL
2 stops23h 38mDelta
sáb. 11/86:00 amSTL - SYD
2 stops33h 35mDelta
Deal found 4/30$1,207
This BYOjet deal was found by Cheapflights users on 4/29. 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 BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/17:45 amSYD - ORD
2 stops29h 56mAir New Zealand
vie. 10/102:20 pmORD - SYD
2 stops26h 25mAir New Zealand
Deal found 4/29$1,214
This Aunt Betty deal was found by Cheapflights users on 4/28. 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 Aunt Betty is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 6/48:55 amSYD - ORD
1 stop39h 20mJapan Airlines
dom. 6/229:12 amORD - SYD
2 stops30h 08mJapan Airlines
Deal found 4/28$1,252
This Qantas Airways deal was found by Cheapflights users on 4/29. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/311:15 amSYD - ORD
1 stop25h 20mQantas Airways
vie. 12/124:45 pmORD - SYD
2 stops26h 00mQantas Airways
Deal found 4/29$1,260
This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/189:30 amSYD - STL
2 stops24h 23mUnited Airlines
sáb. 11/87:00 pmSTL - SYD
1 stop21h 15mUnited Airlines
Deal found 4/29$1,295
This Booking.com deal was found by Cheapflights users on 4/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/44:00 pmSYD - ORD
2 stops33h 57mAir Canada
jue. 12/111:00 pmORD - SYD
2 stops24h 55mAir Canada
Deal found 4/29$1,302
This Aunt Betty deal was found by Cheapflights users on 4/30. 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 Aunt Betty is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 6/1910:10 amSYD - ORD
1 stop43h 15mCathay Pacific
sáb. 6/284:00 pmORD - SYD
1 stop27h 50mCathay Pacific
Deal found 4/30$1,326
This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/111:20 amSYD - ORD
1 stop20h 17mUnited Airlines
mar. 12/912:49 pmORD - SYD
1 stop25h 11mUnited Airlines
Deal found 4/29$1,340
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/79:25 amSYD - MDW
2 stops23h 14mDelta
lun. 8/259:30 amMDW - SYD
2 stops30h 05mDelta
Deal found 4/30$1,349

Cheapflights Fare Finder

Customize 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 2,558,603 searches. Data last updated mayo 1, 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

jue. 6/5

1:15 pm-10:55 pm

2 stops24h 40m

Chicago O'Hare Intl

lun. 6/23

6:10 am-11:45 am

2 stops38h 35m

$997

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

jue. 9/11

11:50 am-8:40 am

1 stop35h 50m

Chicago O'Hare Intl

lun. 9/15

8:20 pm-7:15 pm

2 stops31h 55m

$1,093

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

mar. 6/24

9:10 am-6:35 pm

2 stops24h 25m

Chicago O'Hare Intl

mar. 7/29

4:39 pm-7:05 am

2 stops23h 26m

$1,195

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

lun. 8/18

9:25 am-6:03 pm

2 stops23h 38m

Lambert-St Louis

sáb. 11/8

6:00 am-8:35 am

2 stops33h 35m

$1,207

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

mié. 10/1

7:45 am-10:41 pm

2 stops29h 56m

Chicago O'Hare Intl

vie. 10/10

2:20 pm-8:45 am

2 stops26h 25m

$1,214

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

mié. 6/4

8:55 am-9:15 am

1 stop39h 20m

Chicago O'Hare Intl

dom. 6/22

9:12 am-6:20 am

2 stops30h 08m

$1,252

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

lun. 8/18

9:30 am-6:53 pm

2 stops24h 23m

Lambert-St Louis

sáb. 11/8

7:00 pm-9:15 am

1 stop21h 15m

$1,295

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

jue. 9/11

9:20 am-7:59 am

2 stops37h 39m

Chicago O'Hare Intl

lun. 9/15

8:25 pm-7:20 am

2 stops43h 55m

$1,309

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

jue. 6/19

10:10 am-2:25 pm

1 stop43h 15m

Chicago O'Hare Intl

sáb. 6/28

4:00 pm-10:50 am

1 stop27h 50m

$1,326

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

lun. 8/4

9:30 am-2:42 pm

1 stop20h 12m

Chicago O'Hare Intl

lun. 8/25

4:10 pm-7:00 am

1 stop23h 50m

$1,340

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 37 results
1
2
3
4

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 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 Sydney to Illinois

What is the cheapest month to book a flight from Sydney to Illinois?

Currently, August is the cheapest month in which you can book a flight from Sydney to Illinois (average of $245). Flying from Sydney to Illinois in March is currently the most expensive (average of $321). 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.

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 mayo 1, 2025.

When flying from Sydney to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 mayo 1, 2025.
Peruse reviews from past customers who have flown with Air Tahiti Nui, Japan Airlines and ANA from Sydney to Illinois 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.
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Boarding

8.7

Entertainment

7.3

Food

7.8

Crew

9.1

Overall

8.8

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
8.8
Very good
62 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Boarding

8.7

Entertainment

7.3

Food

7.8

Crew

9.1

Overall

8.8

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
1,464 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Boarding

8.7

Entertainment

7.3

Food

7.8

Crew

9.1

Overall

8.8

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
852 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Boarding

8.7

Entertainment

7.3

Food

7.8

Crew

9.1

Overall

8.8

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.
Singapore Airlines
8.1
Very good
1,292 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Boarding

8.7

Entertainment

7.3

Food

7.8

Crew

9.1

Overall

8.8

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.
Emirates
8.0
Very good
3,215 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Comfort

8.1

Boarding

8.7

Entertainment

7.3

Food

7.8

Crew

9.1

Overall

8.8

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?

    Sydney Kingsford Smith (SYD), located 4.6 mi from the city center, is the airport you fly out of when you book flights from Sydney to Illinois.

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

    $694 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Cathay Pacific and Air Canada, with prices starting from $830 and $840, respectively.

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

    The most popular flight routes from Sydney to Illinois are Sydney Kingsford Smith - Chicago O'Hare Intl, Sydney Kingsford Smith - Chicago Midway and 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 vacation 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.

  • What is the cheapest month to book a flight from Sydney to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Sydney to Illinois (average of $245). Flying from Sydney to Illinois in March is currently the most expensive (average of $321). 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

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.

Alternative routes for Sydney to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Sydney to Los Angeles flights
Sydney to San Francisco flights
Sydney to John F Kennedy Intl flights
Sydney to Newark flights
Sydney to LaGuardia flights
Sydney to Honolulu flights
Sydney to Dallas/Fort Worth flights
Sydney to Ontario flights
Sydney to Santa Ana flights
Sydney to Boston flights
Sydney to Hobby flights
Sydney to Seattle flights
Sydney to O'Hare Intl flights
Sydney to Miami flights
Sydney to Dulles Intl flights
Sydney to George Bush Intcntl flights
Sydney to Las Vegas flights
Sydney to San Jose flights
Sydney to Orlando flights
Sydney to Kansas City flights
Sydney to Baltimore flights
Sydney to Reagan-National flights
Sydney to Sky Harbor Intl flights
Sydney to Oakland flights
Sydney to Midway flights
Sydney to Denver flights
Sydney to Sacramento flights
Sydney to Detroit flights
Sydney to Atlanta flights
Sydney to San Diego flights
Sydney to Nashville flights
Sydney to Tampa flights
Coolangatta to Los Angeles flights
Sydney to Portland flights
Sydney to New Orleans flights
Sydney to Minneapolis flights
Sydney to Jacksonville flights
Sydney to Long Beach flights
Sydney to Salt Lake City flights
Sydney to Raleigh flights
Sydney to Kahului flights
Sydney to Melbourne flights
Sydney to St. Louis flights
Sydney to Fort Lauderdale flights
Sydney to Cincinnati flights
Sydney to Austin flights
Sydney to Philadelphia flights

Top 2 airlines flying from Sydney to Illinois

Discover the top 2 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 2,558,603 searches. Data last updated mayo 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$631Average$762FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$884Average$1,296FlexibilityNo cancel feeOn-time71%

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.