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

Qantas Airways and Air Canada 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 April 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.

$533 Cheap Flights from Sydney to Illinois in 2026

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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.

9:20 am - 12:06 pm

SYD

STL

41h 46m

2 stops

4:48 pm - 7:20 am

STL

SYD

23h 32m

2 stops

$1,028Multiple Airlines

Wed, May 20 - Thu, May 28

9:20 am - 12:06 pm

SYD

STL

41h 46m

2 stops

4:48 pm - 7:20 am

STL

SYD

23h 32m

2 stops

$1,065Multiple Airlines

Wed, May 20 - Thu, May 28

9:20 am - 12:06 pm

SYD

STL

41h 46m

2 stops

4:48 pm - 7:20 am

STL

SYD

23h 32m

2 stops

$1,066Multiple Airlines

Wed, May 20 - Thu, May 28

9:20 am - 12:06 pm

SYD

STL

41h 46m

2 stops

12:10 pm - 7:20 am

STL

SYD

52h 10m

2 stops

$1,069Air Canada

Mon, May 25 - Wed, Aug 5

9:20 am - 8:25 pm

SYD

STL

26h 05m

2 stops

1:05 pm - 7:20 am

STL

SYD

51h 15m

3 stops

$1,070Air Canada

Wed, May 20 - Thu, May 28

1:15 pm - 11:13 pm

SYD

ORD

48h 58m

3 stops

8:30 am - 10:10 pm

ORD

SYD

46h 40m

3 stops

$1,076Multiple Airlines

Mon, May 4 - Fri, May 8

9:20 am - 4:33 pm

SYD

STL

22h 13m

2 stops

4:48 pm - 7:20 am

STL

SYD

23h 32m

2 stops

$1,093Air Canada

Fri, May 22 - Fri, May 29

9:15 am - 6:33 pm

SYD

MDW

24h 18m

2 stops

1:00 pm - 6:50 am

MDW

SYD

26h 50m

2 stops

$1,694Delta

Thu, Jun 4 - Wed, Aug 12

9:15 am - 9:09 pm

SYD

MDW

26h 54m

2 stops

2:00 pm - 6:50 am

MDW

SYD

25h 50m

2 stops

$1,695Delta

Thu, Jun 4 - Wed, Aug 12

9:15 am - 9:09 pm

SYD

MDW

26h 54m

2 stops

2:00 pm - 6:50 am

MDW

SYD

25h 50m

2 stops

$1,699Delta

Thu, Jun 4 - Wed, Aug 12

ANA flights from Sydney to Illinois

Our best ANA deals on Sydney to Illinois flight tickets

ANA

Sep 2

SYD11:45 amSydney Kingsford Smith

42h 10m

1 stop

ORD2:55 pmChicago O'Hare Intl

Sep 9

ORD7:50 pmChicago O'Hare Intl

32h 20m

2 stops

SYD7:10 pmSydney Kingsford Smith

$1,179

ANA

Jun 5

SYD11:45 amSydney Kingsford Smith

48h 19m

2 stops

ORD9:04 pmChicago O'Hare Intl

Aug 12

ORD5:45 pmChicago O'Hare Intl

24h 40m

1 stop

SYD9:25 amSydney Kingsford Smith

$1,234

ANA

Jun 5

SYD11:45 amSydney Kingsford Smith

48h 19m

2 stops

ORD9:04 pmChicago O'Hare Intl

Aug 12

ORD5:45 pmChicago O'Hare Intl

24h 40m

1 stop

SYD9:25 amSydney Kingsford Smith

$1,236

Qantas Airways flights from Sydney to Illinois

Our best Qantas Airways deals on Sydney to Illinois flight tickets

Qantas Airways

May 25

SYD12:00 pmSydney Kingsford Smith

19h 33m

1 stop

STL4:33 pmLambert-St Louis

Aug 5

STL8:00 amLambert-St Louis

32h 05m

2 stops

SYD7:05 amSydney Kingsford Smith

$1,221

Qantas Airways

May 25

SYD12:00 pmSydney Kingsford Smith

19h 33m

1 stop

STL4:33 pmLambert-St Louis

Aug 5

STL6:00 amLambert-St Louis

34h 05m

1 stop

SYD7:05 amSydney Kingsford Smith

$1,227

Qantas Airways

May 22

SYD12:00 pmSydney Kingsford Smith

19h 33m

1 stop

STL4:33 pmLambert-St Louis

May 31

STL6:35 amLambert-St Louis

33h 30m

1 stop

SYD7:05 amSydney Kingsford Smith

$1,277

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/20

9:20 am-12:06 pm

2 stops41h 46m

Lambert-St Louis

Thu 5/28

4:48 pm-7:20 am

2 stops23h 32m

$1,028

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/20

9:20 am-12:06 pm

2 stops41h 46m

Lambert-St Louis

Thu 5/28

4:48 pm-7:20 am

2 stops23h 32m

$1,065

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/20

9:20 am-12:06 pm

2 stops41h 46m

Lambert-St Louis

Thu 5/28

4:48 pm-7:20 am

2 stops23h 32m

$1,066

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 5/25

9:20 am-12:06 pm

2 stops41h 46m

Lambert-St Louis

Wed 8/5

12:10 pm-7:20 am

2 stops52h 10m

$1,069

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/20

9:20 am-8:25 pm

2 stops26h 05m

Lambert-St Louis

Thu 5/28

1:05 pm-7:20 am

3 stops51h 15m

$1,070

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 5/4

1:15 pm-11:13 pm

3 stops48h 58m

Chicago O'Hare Intl

Fri 5/8

8:30 am-10:10 pm

3 stops46h 40m

$1,076

Quickest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 5/22

9:20 am-4:33 pm

2 stops22h 13m

Lambert-St Louis

Fri 5/29

4:48 pm-7:20 am

2 stops23h 32m

$1,093

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Thu 6/4

9:15 am-6:33 pm

2 stops24h 18m

Chicago Midway

Wed 8/12

1:00 pm-6:50 am

2 stops26h 50m

$1,694

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Thu 6/4

9:15 am-9:09 pm

2 stops26h 54m

Chicago Midway

Wed 8/12

2:00 pm-6:50 am

2 stops25h 50m

$1,695

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Thu 6/4

9:15 am-9:09 pm

2 stops26h 54m

Chicago Midway

Wed 8/12

2:00 pm-6:50 am

2 stops25h 50m

$1,699

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 August. Flight prices, which tend to average around $1,050, 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 August, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $1,119.

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 $1,332 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 $987 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	21h 39m
Direct flights	None

The fastest flight from Sydney to Illinois takes 21h 39m

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 April 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
United Airlines	PriceFrom $795	Free Cancellation	Rating 7.4 9,649 reviews		Search United Airlines flights
Qantas Airways	PriceFrom $970	Free Cancellation	Rating 7.5 1,027 reviews		Search Qantas Airways 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.