What is the cheapest airline that flies from Sydney Kingsford Smith to Illinois?

American Airlines, United Airlines, and Etihad Airways are the most popular carriers operating from Sydney Kingsford Smith to Illinois

When did momondo last update prices for flights from Sydney Kingsford Smith Airport to Illinois?

Prices for flights from Sydney Kingsford Smith Airport to Illinois are refreshed on a daily basis.

How many operators does momondo search for flights from Sydney Kingsford Smith Airport to Illinois?

As of July 2026, there are 2 operators available to choose from for flights from Sydney Kingsford Smith Airport to Illinois.

How old do you have to be to fly from Sydney Kingsford Smith Airport to Illinois?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Sydney Kingsford Smith Airport to Illinois.

What documentation or ID do you need to fly to Illinois?

The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$428 Cheap Flights from Sydney to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Sydney to Illinois

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:15 pm - 10:58 am

SYD

MDW

36h 43m

3 stops

7:25 am - 11:50 am

MDW

SYD

37h 25m

3 stops

$922Multiple Airlines

Wed, Sep 9 - Sun, Sep 13

1:15 pm - 5:59 am

SYD

ORD

31h 44m

2 stops

6:05 am - 11:50 am

ORD

SYD

38h 45m

3 stops

$986Multiple Airlines

Sun, Sep 6 - Sun, Sep 13

1:15 pm - 5:59 am

SYD

ORD

31h 44m

2 stops

1:02 pm - 11:50 am

ORD

SYD

31h 48m

3 stops

$989Multiple Airlines

Sun, Sep 6 - Sun, Sep 13

1:15 pm - 6:17 am

SYD

ORD

32h 02m

2 stops

9:20 am - 11:50 am

ORD

SYD

35h 30m

3 stops

$1,034Multiple Airlines

Wed, Aug 5 - Wed, Aug 19

10:10 am - 11:46 pm

SYD

STL

29h 36m

1 stop

12:58 pm - 6:55 am

STL

SYD

24h 57m

1 stop

$1,050American Airlines

Wed, Oct 14 - Sun, Nov 8

11:05 am - 6:20 pm

SYD

STL

23h 15m

2 stops

6:02 am - 9:00 am

STL

SYD

33h 58m

1 stop

$1,080American Airlines

Mon, Oct 12 - Thu, Nov 5

11:20 am - 9:21 pm

SYD

STL

26h 01m

2 stops

7:05 pm - 9:20 am

STL

SYD

21h 15m

1 stop

$1,101United Airlines

Wed, Oct 14 - Sun, Nov 8

6:50 pm - 11:46 pm

SYD

STL

20h 56m

1 stop

2:54 pm - 6:55 am

STL

SYD

23h 01m

1 stop

$1,115Qantas Airways

Mon, Oct 12 - Thu, Nov 5

10:20 am - 9:17 pm

SYD

STL

25h 57m

2 stops

4:40 pm - 7:00 am

STL

SYD

23h 20m

2 stops

$1,135United Airlines

Tue, Aug 25 - Sat, Aug 29

9:55 am - 11:05 pm

SYD

ORD

28h 10m

2 stops

4:30 pm - 8:45 am

ORD

SYD

25h 15m

2 stops

$1,177Air New Zealand

Tue, Sep 8 - Tue, Sep 22

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Air New Zealand flights from Sydney to Illinois

Our best Air New Zealand deals on Sydney to Illinois flight tickets

Air New Zealand

Sep 8

SYD9:55 amSydney Kingsford Smith

28h 10m

2 stops

ORD11:05 pmChicago O'Hare Intl

Sep 22

ORD4:30 pmChicago O'Hare Intl

25h 15m

2 stops

SYD8:45 amSydney Kingsford Smith

$1,177

Air New Zealand

Sep 9

SYD11:55 amSydney Kingsford Smith

28h 04m

2 stops

ORD12:59 amChicago O'Hare Intl

Sep 19

ORD1:00 pmChicago O'Hare Intl

28h 45m

2 stops

SYD8:45 amSydney Kingsford Smith

$1,216

Air New Zealand

Aug 20

SYD9:55 amSydney Kingsford Smith

28h 31m

2 stops

ORD11:26 pmChicago O'Hare Intl

Aug 26

ORD2:35 pmChicago O'Hare Intl

29h 05m

2 stops

SYD10:40 amSydney Kingsford Smith

$1,243

Qantas Airways flights from Sydney to Illinois

Our best Qantas Airways deals on Sydney to Illinois flight tickets

Qantas Airways

Oct 12

SYD6:50 pmSydney Kingsford Smith

20h 56m

1 stop

STL11:46 pmLambert-St Louis

Nov 5

STL2:54 pmLambert-St Louis

23h 01m

1 stop

SYD6:55 amSydney Kingsford Smith

$1,115

Qantas Airways

Sep 6

SYD9:10 amSydney Kingsford Smith

28h 49m

1 stop

STL10:59 pmLambert-St Louis

Sep 13

STL6:00 amLambert-St Louis

34h 05m

1 stop

SYD7:05 amSydney Kingsford Smith

$1,143

Qantas Airways

Aug 25

SYD9:10 amSydney Kingsford Smith

28h 49m

1 stop

STL10:59 pmLambert-St Louis

Aug 29

STL6:00 amLambert-St Louis

34h 05m

1 stop

SYD7:05 amSydney Kingsford Smith

$1,165

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Wed 9/9

1:15 pm-10:58 am

3 stops36h 43m

Chicago Midway

Sun 9/13

7:25 am-11:50 am

3 stops37h 25m

$922

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 9/6

1:15 pm-5:59 am

2 stops31h 44m

Chicago O'Hare Intl

Sun 9/13

6:05 am-11:50 am

3 stops38h 45m

$986

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 9/6

1:15 pm-5:59 am

2 stops31h 44m

Chicago O'Hare Intl

Sun 9/13

1:02 pm-11:50 am

3 stops31h 48m

$989

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 8/5

1:15 pm-6:17 am

2 stops32h 02m

Chicago O'Hare Intl

Wed 8/19

9:20 am-11:50 am

3 stops35h 30m

$1,034

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/14

10:10 am-11:46 pm

1 stop29h 36m

Lambert-St Louis

Sun 11/8

12:58 pm-6:55 am

1 stop24h 57m

$1,050

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 10/12

11:05 am-6:20 pm

2 stops23h 15m

Lambert-St Louis

Thu 11/5

6:02 am-9:00 am

1 stop33h 58m

$1,080

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/14

11:20 am-9:21 pm

2 stops26h 01m

Lambert-St Louis

Sun 11/8

7:05 pm-9:20 am

1 stop21h 15m

$1,101

Quickest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 10/12

6:50 pm-11:46 pm

1 stop20h 56m

Lambert-St Louis

Thu 11/5

2:54 pm-6:55 am

1 stop23h 01m

$1,115

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 8/25

10:20 am-9:17 pm

2 stops25h 57m

Lambert-St Louis

Sat 8/29

4:40 pm-7:00 am

2 stops23h 20m

$1,135

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 9/8

9:55 am-11:05 pm

2 stops28h 10m

Chicago O'Hare Intl

Tue 9/22

4:30 pm-8:45 am

2 stops25h 15m

$1,177

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Sydney to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Sydney is in September. Flight prices, which tend to average around $1,054, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $1,068.

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

You are more likely to see cheaper flights to Illinois from Sydney when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $1,370 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Sydney for as low as $1,027 on momondo.

Can stopping save me money on Sydney to Illinois flights?

You could potentially save up to 9% on your flight if you consider stops on a Sydney to Illinois flight.

Cheap Sydney to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Sydney to Illinois

Fastest flight time	22h 24m
Direct flights	None

The fastest flight from Sydney to Illinois takes 22h 24m

There are no direct flights from Sydney to Illinois. There are no popular flight routes from Sydney to Illinois.

Search flight deals

Frequently asked questions about flying from Sydney to Illinois

When did momondo last update prices for flights from Sydney Kingsford Smith Airport to Illinois?
Prices for flights from Sydney Kingsford Smith Airport to Illinois are refreshed on a daily basis.
How many operators does momondo search for flights from Sydney Kingsford Smith Airport to Illinois?
As of July 2026, there are 2 operators available to choose from for flights from Sydney Kingsford Smith Airport to Illinois.
How old do you have to be to fly from Sydney Kingsford Smith Airport to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Sydney Kingsford Smith Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Sydney to Illinois

Compare and see reviews for airlines that fly from Sydney to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Qantas Airways	PriceFrom $970	Free Cancellation	Rating 7.5 1,067 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,113	Free Cancellation	Rating 7.4 10,034 reviews		Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Sydney to Illinois?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Sydney to Illinois for you.

Can I find flights from Sydney to Illinois with flexible booking policies on momondo?

Flights from Sydney to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Sydney to Illinois?

Once you have performed a search for Sydney to Illinois flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Sydney to Illinois right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Sydney to Illinois flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.