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Cheap flights from Illinois to Sydney from $674
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 30/8. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
23 Jul — 30 Jul1
Return
1 adult
Economy
Cheap flight deals from Illinois to Sydney
Keep the following information in mind while searching for Illinois to Sydney flight deals. Data was last updated 18 July 2025.
Find flight deals from Illinois to Sydney
Cheapest flights from Illinois to SydneyExplore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 July 2025.
Explore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 July 2025.
Mon 1/907:19ORD - SYD
2 stops32h 36mUnited Airlines
Mon 8/910:20SYD - ORD
2 stops25h 00mUnited Airlines
Deal found 18/7$1,552
Mon 27/1006:15MDW - SYD
2 stops33h 10mMultiple Airlines
Sun 9/1114:20SYD - MDW
2 stops26h 05mMultiple Airlines
Deal found 17/7$1,641
Sat 30/814:07ORD - SYD
2 stops33h 33mMultiple Airlines
Sat 6/917:45SYD - ORD
1 stop33h 04mMultiple Airlines
Deal found 15/7$1,658
Wed 5/1106:15STL - SYD
2 stops47h 10mQantas Airways
Sun 23/1114:20SYD - STL
1 stop20h 57mQantas Airways
Deal found 18/7$1,664
Sun 31/813:30STL - SYD
2 stops26h 50mAir Canada
Sun 7/909:20SYD - STL
2 stops49h 37mAir Canada
Deal found 17/7$1,681
Wed 29/1016:55STL - SYD
2 stops23h 40mMultiple Airlines
Sat 15/1111:20SYD - STL
2 stops45h 09mMultiple Airlines
Deal found 17/7$1,743
Thu 18/915:55PIA - SYD
2 stops24h 05mUnited Airlines
Mon 22/909:30SYD - PIA
2 stops44h 48mUnited Airlines
Deal found 18/7$1,745
Mon 24/1116:25ORD - SYD
1 stop34h 50mANA
Sun 7/1221:45SYD - ORD
1 stop26h 35mANA
Deal found 18/7$1,796
Mon 1/919:41STL - SYD
1 stop20h 14mAmerican Airlines
Mon 8/909:10SYD - STL
1 stop28h 49mAmerican Airlines
Deal found 17/7$1,797
Mon 1/917:49STL - SYD
1 stop22h 06mUnited Airlines
Mon 8/910:20SYD - STL
1 stop21h 33mUnited Airlines
Deal found 18/7$1,822
Sat 6/918:30ORD - SYD
2 stops26h 15mFiji Airways
Tue 16/906:00SYD - ORD
2 stops30h 24mFiji Airways
Deal found 16/7$1,891
Mon 25/811:54EVV - SYD
2 stops28h 01mAmerican Airlines
Tue 2/912:10SYD - EVV
2 stops25h 39mAmerican Airlines
Deal found 17/7$2,082
Cheapflights Fare Finder
Customise your flight search to find flights from Illinois to Sydney 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 18 July 2025.
Use the filters below to find and compare flights from Illinois to Sydney that are best for you.
Fly from
Illinois
Fly to
Sydney
Route
Depart
Return
Price
ChicagoSydney
ORD - SYD
ORDSYD
Chicago O'Hare Intl
Mon 1/9
07:19-06:55
2 stops32h 36m
Sydney Kingsford Smith
Mon 8/9
10:20-20:20
2 stops25h 00m
$1,552
ChicagoSydney
MDW - SYD
MDWSYD
Chicago Midway
Mon 27/10
06:15-07:25
2 stops33h 10m
Sydney Kingsford Smith
Sun 9/11
14:20-23:25
2 stops26h 05m
$1,641
ChicagoSydney
ORD - SYD
ORDSYD
Chicago O'Hare Intl
Sat 30/8
14:07-14:40
2 stops33h 33m
Sydney Kingsford Smith
Sat 6/9
17:45-11:49
1 stop33h 04m
$1,658
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Wed 5/11
06:15-22:25
2 stops47h 10m
Sydney Kingsford Smith
Sun 23/11
14:20-18:17
1 stop20h 57m
$1,664
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Sun 31/8
13:30-07:20
2 stops26h 50m
Sydney Kingsford Smith
Sun 7/9
09:20-19:57
2 stops49h 37m
$1,681
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Wed 29/10
16:55-08:35
2 stops23h 40m
Sydney Kingsford Smith
Sat 15/11
11:20-15:29
2 stops45h 09m
$1,743
PeoriaSydney
PIA - SYD
PIASYD
Greater Peoria
Thu 18/9
15:55-07:00
2 stops24h 05m
Sydney Kingsford Smith
Mon 22/9
09:30-15:18
2 stops44h 48m
$1,745
ChicagoSydney
ORD - SYD
ORDSYD
Chicago O'Hare Intl
Mon 24/11
16:25-20:15
1 stop34h 50m
Sydney Kingsford Smith
Sun 7/12
21:45-07:20
1 stop26h 35m
$1,796
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Mon 1/9
19:41-06:55
1 stop20h 14m
Sydney Kingsford Smith
Mon 8/9
09:10-22:59
1 stop28h 49m
$1,797
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Mon 1/9
17:49-06:55
1 stop22h 06m
Sydney Kingsford Smith
Mon 8/9
10:20-16:53
1 stop21h 33m
$1,822
Showing 1-10 of 28 results
Best time to book a flight from Illinois to Sydney
Have a flexible travel schedule? Discover the best time to fly to Sydney 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 Sydney
What is the cheapest month to book a flight from Illinois to Sydney?
Currently, May is the cheapest month in which you can book a flight from Illinois to Sydney (average of $129). Flying from Illinois to Sydney in October is currently the most expensive (average of $171). 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 IL to SYD?
Find hourly flight availability from Illinois to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 July 2025.
When flying from Illinois to Sydney, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Reviews of airlines servicing Sydney
Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated 18 July 2025.
Get a feel of what it's like to fly with ANA, Fiji Airways, andDelta from Illinois to Sydney by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.4
Food
7.7
Boarding
8.5
Comfort
8.2
Entertainment
7.9
Crew
8.7
Reviews
1 / 20
2.0
MediocreAnonymous,July 2025
MNL - NRT
Overall
8.4
Food
7.7
Boarding
8.5
Comfort
8.2
Entertainment
7.9
Crew
8.7
Reviews
1 / 20
2.0
MediocreAnonymous,July 2025
MNL - NRT
Overall
8.4
Food
7.7
Boarding
8.5
Comfort
8.2
Entertainment
7.9
Crew
8.7
Reviews
1 / 20
2.0
MediocreAnonymous,July 2025
MNL - NRT
Overall
8.4
Food
7.7
Boarding
8.5
Comfort
8.2
Entertainment
7.9
Crew
8.7
Reviews
1 / 20
2.0
MediocreAnonymous,July 2025
MNL - NRT
Overall
8.4
Food
7.7
Boarding
8.5
Comfort
8.2
Entertainment
7.9
Crew
8.7
Reviews
1 / 20
2.0
MediocreAnonymous,July 2025
MNL - NRT
Overall
8.4
Food
7.7
Boarding
8.5
Comfort
8.2
Entertainment
7.9
Crew
8.7
Reviews
1 / 20
2.0
MediocreAnonymous,July 2025
MNL - NRT
Related info for your journey
Find useful and relevant information for your journey from Illinois to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Travelling to a place near Sydney?
Book flights to Sydney if you plan to visit one of these locationsParramatta
Wollongong
Katoomba
Penrith
Manly
Coogee
Cronulla
Terrigal
Lithgow
Randwick
Bondi Beach
Leura
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Alternative routes for Illinois to Sydney
See prices for flight routes from nearby airports that may be better suited for you.
Top 2 airlines flying from Illinois to Sydney
Discover the top 2 airlines that operate flights from Illinois to Sydney. 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 18 July 2025.
Fly with Cheapflights
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How does Cheapflights help users find flights from Illinois to Sydney?
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Why should you use Cheapflights to find cheap flight tickets from Illinois to Sydney?
Millions of users choose and trust Cheapflights to book the best flight deals from Illinois to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.
Can Cheapflights find flights from Illinois to Sydney with no change fees?
Yes! Cheapflights helps users easily find flights from Illinois to Sydney with no change fees.
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