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

Delta, Etihad Airways, and Qantas Airways are the most popular carriers operating from Illinois to Sydney Kingsford Smith

What airlines fly to Sydney?

Qantas Airways, Air Canada and American Airlines are the top three most popular airlines that fly to Sydney from Illinois according to our data. Qantas Airways is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 8 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.

How long does it take to fly to Sydney?

Flight times from Illinois to Sydney vary, but if you’re flying out of Chicago and flying into Sydney (one of the most popular routes), then the duration is 24h 03m on average. Another popular route from Illinois to Sydney is flying from Peoria to Sydney, which will take roughly 26h 42m. Keep in mind that layovers or delays could extend your travel time.

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

Prices for flights from Illinois to Sydney Kingsford Smith Airport are updated daily.

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

There are 8 operators available for flights from Illinois to Sydney Kingsford Smith Airport as of July 2026.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Sydney Kingsford Smith Airport.

What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

The required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$479 Cheap Flights from Illinois to Sydney in 2026

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Find the cheapest flights from Illinois to Sydney

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:20 am - 11:50 am

ORD

SYD

35h 30m

3 stops

1:15 pm - 5:59 am

SYD

ORD

31h 44m

2 stops

$989Multiple Airlines

Wed, Aug 12 - Wed, Aug 19

9:20 am - 11:50 am

ORD

SYD

35h 30m

3 stops

1:15 pm - 5:59 am

SYD

ORD

31h 44m

2 stops

$1,016Multiple Airlines

Thu, Aug 13 - Thu, Aug 20

9:20 am - 11:50 am

ORD

SYD

35h 30m

3 stops

1:15 pm - 12:49 am

SYD

ORD

50h 34m

3 stops

$1,050Multiple Airlines

Wed, Aug 12 - Wed, Aug 19

3:32 pm - 6:55 am

STL

SYD

24h 23m

1 stop

12:00 pm - 6:05 pm

SYD

STL

21h 05m

1 stop

$1,146Qantas Airways

Mon, Aug 17 - Mon, Aug 24

6:00 am - 7:30 am

STL

SYD

34h 30m

1 stop

9:10 am - 10:59 pm

SYD

STL

28h 49m

1 stop

$1,152Qantas Airways

Mon, Aug 10 - Mon, Aug 17

8:42 am - 6:55 am

STL

SYD

31h 13m

1 stop

10:20 am - 6:39 pm

SYD

STL

23h 19m

1 stop

$1,175Air New Zealand

Wed, Aug 12 - Wed, Aug 19

4:48 pm - 7:00 am

STL

SYD

23h 12m

2 stops

9:30 am - 7:16 pm

SYD

STL

24h 46m

2 stops

$1,177Air New Zealand

Mon, Aug 10 - Mon, Aug 17

4:48 pm - 7:00 am

STL

SYD

23h 12m

2 stops

10:20 am - 6:39 pm

SYD

STL

23h 19m

1 stop

$1,186United Airlines

Mon, Aug 10 - Mon, Aug 17

1:38 pm - 7:00 am

STL

SYD

26h 22m

2 stops

9:30 am - 4:34 pm

SYD

STL

22h 04m

2 stops

$1,190United Airlines

Mon, Aug 10 - Mon, Aug 17

4:43 pm - 9:45 am

PIA

SYD

26h 02m

2 stops

12:00 pm - 11:19 pm

SYD

PIA

26h 19m

1 stop

$1,258American Airlines

Wed, Aug 26 - Mon, Sep 7

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Qantas Airways flights from Illinois to Sydney

Our best Qantas Airways deals on Illinois to Sydney flight tickets

Qantas Airways

Aug 17

STL3:32 pmLambert-St Louis

24h 23m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 24

SYD12:00 pmSydney Kingsford Smith

21h 05m

1 stop

STL6:05 pmLambert-St Louis

$1,146

Qantas Airways

Aug 10

STL6:00 amLambert-St Louis

34h 30m

1 stop

SYD7:30 amSydney Kingsford Smith

Aug 17

SYD9:10 amSydney Kingsford Smith

28h 49m

1 stop

STL10:59 pmLambert-St Louis

$1,152

Qantas Airways

Aug 22

STL5:11 pmLambert-St Louis

22h 44m

1 stop

SYD6:55 amSydney Kingsford Smith

Sep 8

SYD5:50 pmSydney Kingsford Smith

20h 09m

1 stop

STL10:59 pmLambert-St Louis

$1,194

Delta flights from Illinois to Sydney

Our best Delta deals on Illinois to Sydney flight tickets

Delta

Aug 10

STL3:39 pmLambert-St Louis

24h 11m

2 stops

SYD6:50 amSydney Kingsford Smith

Aug 17

SYD9:15 amSydney Kingsford Smith

29h 11m

2 stops

STL11:26 pmLambert-St Louis

$1,190

Delta

Aug 8

STL5:00 pmLambert-St Louis

46h 50m

2 stops

SYD6:50 amSydney Kingsford Smith

Aug 19

SYD9:15 amSydney Kingsford Smith

24h 40m

2 stops

STL6:55 pmLambert-St Louis

$1,205

Delta

Aug 8

STL5:00 pmLambert-St Louis

46h 50m

2 stops

SYD6:50 amSydney Kingsford Smith

Aug 16

SYD9:15 amSydney Kingsford Smith

54h 26m

2 stops

STL12:41 amLambert-St Louis

$1,221

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 8/12

9:20 am-11:50 am

3 stops35h 30m

Sydney Kingsford Smith

Wed 8/19

1:15 pm-5:59 am

2 stops31h 44m

$989

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 8/13

9:20 am-11:50 am

3 stops35h 30m

Sydney Kingsford Smith

Thu 8/20

1:15 pm-5:59 am

2 stops31h 44m

$1,016

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 8/12

9:20 am-11:50 am

3 stops35h 30m

Sydney Kingsford Smith

Wed 8/19

1:15 pm-12:49 am

3 stops50h 34m

$1,050

Quickest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/17

3:32 pm-6:55 am

1 stop24h 23m

Sydney Kingsford Smith

Mon 8/24

12:00 pm-6:05 pm

1 stop21h 05m

$1,146

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/10

6:00 am-7:30 am

1 stop34h 30m

Sydney Kingsford Smith

Mon 8/17

9:10 am-10:59 pm

1 stop28h 49m

$1,152

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/12

8:42 am-6:55 am

1 stop31h 13m

Sydney Kingsford Smith

Wed 8/19

10:20 am-6:39 pm

1 stop23h 19m

$1,175

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/10

4:48 pm-7:00 am

2 stops23h 12m

Sydney Kingsford Smith

Mon 8/17

9:30 am-7:16 pm

2 stops24h 46m

$1,177

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/10

4:48 pm-7:00 am

2 stops23h 12m

Sydney Kingsford Smith

Mon 8/17

10:20 am-6:39 pm

1 stop23h 19m

$1,186

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/10

1:38 pm-7:00 am

2 stops26h 22m

Sydney Kingsford Smith

Mon 8/17

9:30 am-4:34 pm

2 stops22h 04m

$1,190

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Wed 8/26

4:43 pm-9:45 am

2 stops26h 02m

Sydney Kingsford Smith

Mon 9/7

12:00 pm-11:19 pm

1 stop26h 19m

$1,258

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 Illinois to Sydney

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

Other information

What is the cheapest month to fly to Sydney?

In general, May is the cheapest month to fly from Illinois to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $142. If you are unable to visit Sydney during the month of May, then departing from Illinois during the month March is also very affordable. Most momondo users find prices during this month for around $146.

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

You are more likely to see cheaper flights to Sydney from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,412 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Illinois for as low as $1,154 on momondo.

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 19% on your flight if you consider stops on a Illinois to Sydney flight.

Cheap Illinois to Sydney flight deals and tips

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

Fastest flight time	21h 10m
Direct flights	None

The fastest flight from Illinois to Sydney takes 21h 10m

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

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Frequently asked questions about flying from Illinois to Sydney

When did momondo last update prices for flights from Illinois to Sydney Kingsford Smith Airport?
Prices for flights from Illinois to Sydney Kingsford Smith Airport are updated daily.
How many operators does momondo search for flights from Illinois to Sydney Kingsford Smith Airport?
There are 8 operators available for flights from Illinois to Sydney Kingsford Smith Airport as of July 2026.
How old do you have to be to fly from Illinois to Sydney Kingsford Smith Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Sydney Kingsford Smith Airport.
What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?
The required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Illinois to Sydney

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

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $198	Free Cancellation	Rating 7.1 11,766 reviews	Search American Airlines flights
Delta	PriceFrom $261	Free Cancellation	Rating 7.8 8,451 reviews	Search Delta flights
Fiji Airways	PriceFrom $716	Free Cancellation	Rating 8.1 246 reviews	Search Fiji Airways flights
Qantas Airways	PriceFrom $836	Free Cancellation	Rating 7.5 1,056 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $870	Free Cancellation	Rating 7.4 9,929 reviews	Search United Airlines flights
Air Canada	PriceFrom $898	Free Cancellation	Rating 7.1 11,291 reviews	Search Air Canada flights
ANA	PriceFrom $1,193	Free Cancellation	Rating 8.3 1,260 reviews	Search ANA flights
Air New Zealand	PriceFrom $1,308	Free Cancellation	Rating 8.0 649 reviews	Search Air New Zealand flights

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

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 Illinois to Sydney for you.

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

All flight searches from Illinois to Sydney on momondo can be filtered to show those which offer flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Illinois to Sydney.

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

If you are simply researching potential flights to Sydney, momondo offers a useful price alert feature which will track prices for flights to Sydney from Illinois and alert you when they change.

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Cheap flights from Illinois to Sydney from $479

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Sydney departing on 8/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Qantas Airways flights from Illinois to Sydney

Our best Qantas Airways deals on Illinois to Sydney flight tickets

Delta flights from Illinois to Sydney

Our best Delta deals on Illinois to Sydney flight tickets

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How to get the cheapest flight ticket from Illinois to Sydney

What is the cheapest month to fly to Sydney?

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

Can stopping save me money on Illinois to Sydney flights?

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

What airlines fly to Sydney?

How long does it take to fly to Sydney?

Cheap Illinois to Sydney flight deals and tips

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

Fastest flight time

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Frequently asked questions about flying from Illinois to Sydney

Best airlines flying from Illinois to Sydney

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

Traveling to a place near Sydney?

Why use momondo?

An easier way to manage your Sydney trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

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