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

United Airlines and Delta 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 June 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.

$559 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.

9:10 am - 8:23 am

SYD

STL

38h 13m

2 stops

5:42 am - 6:55 am

STL

SYD

34h 13m

1 stop

$996American Airlines

Fri, Aug 7 - Tue, Aug 11

9:10 am - 11:59 pm

SYD

STL

29h 49m

1 stop

3:35 pm - 7:05 am

STL

SYD

24h 30m

2 stops

$998American Airlines

Thu, Jul 30 - Sun, Aug 9

9:10 am - 11:59 pm

SYD

STL

29h 49m

1 stop

6:00 am - 7:05 am

STL

SYD

34h 05m

1 stop

$1,003Qantas Airways

Thu, Jul 30 - Sun, Aug 9

9:20 am - 6:42 pm

SYD

STL

48h 22m

3 stops

12:10 pm - 7:20 am

STL

SYD

52h 10m

2 stops

$1,007Air Canada

Thu, Jul 30 - Sun, Aug 9

9:20 am - 6:42 pm

SYD

STL

48h 22m

3 stops

12:10 pm - 7:20 am

STL

SYD

52h 10m

3 stops

$1,015Air Canada

Thu, Jul 30 - Sun, Aug 9

9:10 am - 10:59 pm

SYD

STL

28h 49m

1 stop

6:30 am - 7:05 am

STL

SYD

33h 35m

1 stop

$1,045Qantas Airways

Wed, Aug 26 - Wed, Sep 9

1:15 pm - 6:17 am

SYD

ORD

32h 02m

2 stops

9:28 am - 10:10 pm

ORD

SYD

45h 42m

3 stops

$1,067Multiple Airlines

Sat, Jul 25 - Sat, Aug 1

10:40 am - 5:21 pm

SYD

ORD

23h 41m

1 stop

2:55 pm - 8:30 am

ORD

SYD

24h 35m

1 stop

$1,069Delta

Sun, Nov 15 - Sun, Nov 22

9:15 am - 11:59 pm

SYD

ORD

29h 44m

2 stops

11:30 am - 7:50 am

ORD

SYD

28h 20m

2 stops

$1,074Delta

Thu, Oct 1 - Fri, Oct 16

9:10 am - 6:17 am

SYD

ORD

36h 07m

1 stop

9:28 am - 7:05 am

ORD

SYD

30h 37m

2 stops

$1,224Multiple Airlines

Sat, Jul 25 - Sat, Aug 1

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American Airlines flights from Sydney to Illinois

Our best American Airlines deals on Sydney to Illinois flight tickets

American Airlines

Aug 7

SYD9:10 amSydney Kingsford Smith

38h 13m

2 stops

STL8:23 amLambert-St Louis

Aug 11

STL5:42 amLambert-St Louis

34h 13m

1 stop

SYD6:55 amSydney Kingsford Smith

$996

American Airlines

Jul 30

SYD9:10 amSydney Kingsford Smith

29h 49m

1 stop

STL11:59 pmLambert-St Louis

Aug 9

STL3:35 pmLambert-St Louis

24h 30m

2 stops

SYD7:05 amSydney Kingsford Smith

$998

American Airlines

Aug 26

SYD9:10 amSydney Kingsford Smith

23h 55m

2 stops

STL6:05 pmLambert-St Louis

Sep 9

STL3:34 pmLambert-St Louis

24h 31m

2 stops

SYD7:05 amSydney Kingsford Smith

$999

Air Canada flights from Sydney to Illinois

Our best Air Canada deals on Sydney to Illinois flight tickets

Air Canada

Jul 30

SYD9:20 amSydney Kingsford Smith

48h 22m

3 stops

STL6:42 pmLambert-St Louis

Aug 9

STL12:10 pmLambert-St Louis

52h 10m

2 stops

SYD7:20 amSydney Kingsford Smith

$1,007

Air Canada

Jul 30

SYD9:20 amSydney Kingsford Smith

48h 22m

3 stops

STL6:42 pmLambert-St Louis

Aug 9

STL12:10 pmLambert-St Louis

52h 10m

3 stops

SYD7:20 amSydney Kingsford Smith

$1,015

Air Canada

Jul 30

SYD9:20 amSydney Kingsford Smith

48h 22m

2 stops

STL6:42 pmLambert-St Louis

Aug 3

STL12:10 pmLambert-St Louis

52h 10m

2 stops

SYD7:20 amSydney Kingsford Smith

$1,067

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 8/7

9:10 am-8:23 am

2 stops38h 13m

Lambert-St Louis

Tue 8/11

5:42 am-6:55 am

1 stop34h 13m

$996

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/30

9:10 am-11:59 pm

1 stop29h 49m

Lambert-St Louis

Sun 8/9

3:35 pm-7:05 am

2 stops24h 30m

$998

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/30

9:10 am-11:59 pm

1 stop29h 49m

Lambert-St Louis

Sun 8/9

6:00 am-7:05 am

1 stop34h 05m

$1,003

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/30

9:20 am-6:42 pm

3 stops48h 22m

Lambert-St Louis

Sun 8/9

12:10 pm-7:20 am

2 stops52h 10m

$1,007

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/30

9:20 am-6:42 pm

3 stops48h 22m

Lambert-St Louis

Sun 8/9

12:10 pm-7:20 am

3 stops52h 10m

$1,015

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/26

9:10 am-10:59 pm

1 stop28h 49m

Lambert-St Louis

Wed 9/9

6:30 am-7:05 am

1 stop33h 35m

$1,045

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 7/25

1:15 pm-6:17 am

2 stops32h 02m

Chicago O'Hare Intl

Sat 8/1

9:28 am-10:10 pm

3 stops45h 42m

$1,067

Quickest round-trip

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 11/15

10:40 am-5:21 pm

1 stop23h 41m

Chicago O'Hare Intl

Sun 11/22

2:55 pm-8:30 am

1 stop24h 35m

$1,069

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 10/1

9:15 am-11:59 pm

2 stops29h 44m

Chicago O'Hare Intl

Fri 10/16

11:30 am-7:50 am

2 stops28h 20m

$1,074

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 7/25

9:10 am-6:17 am

1 stop36h 07m

Chicago O'Hare Intl

Sat 8/1

9:28 am-7:05 am

2 stops30h 37m

$1,224

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 December. Flight prices, which tend to average around $468, 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 December, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $627.

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 $1,040 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	19h 32m
Direct flights	None

The fastest flight from Sydney to Illinois takes 19h 32m

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 June 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 1,046 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,113	Free Cancellation	Rating 7.4 9,813 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.