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Cheap flights from Sydney to Illinois from $734

SYD — ORD
10 Dec — 17 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Sydney to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from Sydney to Illinois

Thu 12/1114:00 -
3 stops27h 21m
Wed 25/1107:49 -
3 stops35h 46m
Deal found 6/11$1,663
Thu 12/1122:20 -
1 stop31h 10m
Wed 25/1114:10 -
1 stop26h 25m
Deal found 6/11$1,786
Thu 19/1108:45 -
1 stop44h 45m
Wed 2/1214:10 -
1 stop26h 25m
Deal found 6/11$1,793
Thu 19/1111:55 -
2 stops27h 34m
Wed 2/1214:29 -
2 stops27h 06m
Deal found 6/11$1,880
Thu 24/1216:00 -
2 stops33h 00m
Thu 31/1215:30 -
1 stop25h 05m
Deal found 9/11$2,018
Mon 16/1111:05 -
1 stop42h 25m
Thu 3/1214:10 -
1 stop29h 50m
Deal found 7/11$2,069
Thu 19/1122:20 -
1 stop31h 10m
Wed 2/1207:00 -
2 stops30h 25m
Deal found 6/11$2,079
Thu 26/1111:15 -
2 stops30h 38m
Thu 3/1207:00 -
2 stops30h 25m
Deal found 9/11$2,209

Find flight deals from Sydney to Illinois

Round-trip from

$1,410

One-way from

$734

Popular in

May

Cheapest in

October

Average price

$1,760
Air Canada
  • Air Canada
  • 21/1-28/1
  • 3 total stops
  • 46h 52m total
  • Sydney to Illinois
Search Deals
5/3-31/12
  • 5/3-31/12
  • 2 total stops
  • 34h 05m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($228 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($73 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2026
Search Deals

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Sydney to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Sat 20/3

22:20-13:30

1 stop31h 10m

Chicago O'Hare Intl

Wed 31/12

00:00-16:00

Nonstop0h 00m

$1,094

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Sat 20/3

19:45-13:30

2 stops33h 45m

Chicago O'Hare Intl

Wed 31/12

00:00-16:00

Nonstop0h 00m

$1,354

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Thu 21/1

11:20-08:07

2 stops37h 47m

Chicago O'Hare Intl

Thu 28/1

08:40-09:35

2 stops31h 55m

$1,425
Fastest return journey

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Fri 4/12

21:40-05:37

3 stops24h 57m

Chicago O'Hare Intl

Wed 31/12

00:00-16:00

Nonstop0h 00m

$1,431

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Thu 15/4

20:10-15:05

1 stop33h 55m

Chicago O'Hare Intl

Wed 31/12

00:00-16:00

Nonstop0h 00m

$1,437

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Thu 26/11

15:50-14:30

1 stop39h 40m

Chicago O'Hare Intl

Wed 31/12

00:00-16:00

Nonstop0h 00m

$1,444

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Thu 26/11

21:40-14:21

2 stops33h 41m

Chicago O'Hare Intl

Wed 31/12

00:00-16:00

Nonstop0h 00m

$1,465

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Thu 10/12

21:40-05:37

3 stops24h 57m

Chicago O'Hare Intl

Wed 31/12

00:00-16:00

Nonstop0h 00m

$1,663

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Thu 17/12

07:35-14:30

3 stops47h 55m

Chicago O'Hare Intl

Wed 31/12

00:00-16:00

Nonstop0h 00m

$1,822

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Mon 16/11

11:45-12:30

2 stops41h 45m

Chicago O'Hare Intl

Thu 3/12

14:10-13:00

1 stop29h 50m

$2,174

Flights are sorted by cheapest return flights first.

Deals found on 9/11

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

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

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, October is the cheapest month in which you can book a flight from Sydney to Illinois (average of $1,540). Flying from Sydney to Illinois in December is currently the most expensive (average of $2,302). 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.

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

Airfare is below average for this route at the moment.
Sydney to Illinois flights typically cost between $1,433 and $2,167 in January.
The cheapest return price found within the last 5 days was $1,410 on Air Canada (21 Jan–28 Jan).

How far ahead should I book a flight from Sydney to Illinois?

To ensure you get the cheapest price possible for a flight from Sydney to Illinois, you should look to book at least 81 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from Sydney to Illinois, such as Air New Zealand,Qantas Airways, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air New Zealand
8.0
Very Good
683 reviews
Check prices

Boarding

8.2

Food

7.5

Overall

8.0

Crew

8.5

Entertainment

7.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2026

FLL - IAH

All good. Problem was delay caused by weather in Houston creating anxiety about my AirNZ connection. Nothing that United could do about that, and in fairness th captain kept us very well informed
Air New Zealand
8.0
Very Good
683 reviews
Air New Zealand
8.0
Very Good
683 reviews
Check prices

Boarding

8.2

Food

7.5

Overall

8.0

Crew

8.5

Entertainment

7.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2026

FLL - IAH

All good. Problem was delay caused by weather in Houston creating anxiety about my AirNZ connection. Nothing that United could do about that, and in fairness th captain kept us very well informed
Qantas Airways
7.5
Good
1,123 reviews
Air New Zealand
8.0
Very Good
683 reviews
Check prices

Boarding

8.2

Food

7.5

Overall

8.0

Crew

8.5

Entertainment

7.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2026

FLL - IAH

All good. Problem was delay caused by weather in Houston creating anxiety about my AirNZ connection. Nothing that United could do about that, and in fairness th captain kept us very well informed
United Airlines
7.3
Good
10,471 reviews
Air New Zealand
8.0
Very Good
683 reviews
Check prices

Boarding

8.2

Food

7.5

Overall

8.0

Crew

8.5

Entertainment

7.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2026

FLL - IAH

All good. Problem was delay caused by weather in Houston creating anxiety about my AirNZ connection. Nothing that United could do about that, and in fairness th captain kept us very well informed
Air Canada
7.1
Good
11,880 reviews
Air New Zealand
8.0
Very Good
683 reviews
Check prices

Boarding

8.2

Food

7.5

Overall

8.0

Crew

8.5

Entertainment

7.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2026

FLL - IAH

All good. Problem was delay caused by weather in Houston creating anxiety about my AirNZ connection. Nothing that United could do about that, and in fairness th captain kept us very well informed
American Airlines
7.0
Good
12,224 reviews
Air New Zealand
8.0
Very Good
683 reviews
Check prices

Boarding

8.2

Food

7.5

Overall

8.0

Crew

8.5

Entertainment

7.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2026

FLL - IAH

All good. Problem was delay caused by weather in Houston creating anxiety about my AirNZ connection. Nothing that United could do about that, and in fairness th captain kept us very well informed

Related info for your journey

  • 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.

  • How long is the flight from Sydney to Illinois?

    Departing from Sydney to Illinois will take you 37h 45m. The distance between Sydney and Illinois is about 14851 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

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

  • 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.

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

    Currently, October is the cheapest month in which you can book a flight from Sydney to Illinois (average of $1,540). Flying from Sydney to Illinois in December is currently the most expensive (average of $2,302). 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

Top 6 airlines flying from Sydney to Illinois

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$969Average$1,602FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapest$971Average$1,371FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$1,071Average$1,859FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air New ZealandCheapest$1,370Average$1,881FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
United AirlinesCheapest$1,432Average$1,915FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Qantas AirwaysCheapest$1,552Average$1,947FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights

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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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