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

Air Canada, Fiji Airways, and ANA are the most popular carriers operating from Illinois to Sydney Kingsford Smith

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 23h 58m on average. Another popular route from Illinois to Sydney is flying from Peoria to Sydney, which will take roughly 24h 05m. Keep in mind that layovers or delays could extend your travel time.

What airlines fly to Sydney?

American Airlines, Qantas Airways and United Airlines are the top three most popular airlines that fly to Sydney from Illinois according to our data. American Airlines is the first choice among our users, with 53% 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.

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 August 2025.

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.

$391 Cheap Flights from Illinois to Sydney in 2025

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Find the cheapest flights from Illinois to Sydney

Round-trip

One-way

Last minute

Cheap round-trip flights

3:40 pm - 7:20 amORD-SYD

24h 40m1 stop

9:20 am - 3:00 pmSYD-ORD

20h 40m1 stop

$834Air Canada

Find Deal

Sun, Aug 31 - Sun, Sep 14

10:38 am - 9:35 amORD-SYD

29h 57m2 stops

11:20 am - 8:05 amSYD-ORD

37h 45m2 stops

$835Air Canada

Find Deal

Tue, Nov 18 - Tue, Feb 24

6:20 am - 12:45 pmORD-SYD

38h 25m2 stops

2:00 pm - 11:59 pmSYD-ORD

25h 59m2 stops

$962

Find Deal

Mon, Oct 20 - Sun, Nov 2

1:30 pm - 9:35 amSTL-SYD

27h 05m2 stops

11:20 am - 3:29 pmSYD-STL

45h 09m2 stops

$1,006

Find Deal

Sun, Feb 1 - Sun, Feb 15

5:54 pm - 12:15 pmSTL-SYD

25h 21m2 stops

2:20 pm - 4:06 pmSYD-STL

18h 46m1 stop

$1,082Qantas Airways

Find Deal

Sun, Feb 1 - Sun, Feb 15

4:07 pm - 6:55 amSTL-SYD

21h 48m1 stop

7:20 am - 11:40 amSYD-STL

21h 20m2 stops

$1,090Qantas Airways

Find Deal

Fri, Nov 28 - Sun, Dec 14

11:20 am - 10:30 amSTL-SYD

30h 10m2 stops

9:55 am - 4:27 pmSYD-STL

47h 32m2 stops

$1,225Air New Zealand

Find Deal

Mon, Nov 24 - Mon, Dec 8

8:20 am - 9:45 pmSTL-SYD

44h 25m2 stops

9:55 am - 9:59 pmSYD-STL

29h 04m2 stops

$1,237Air New Zealand

Find Deal

Wed, Nov 5 - Sun, Nov 23

5:52 pm - 6:10 amSTL-SYD

45h 18m2 stops

9:50 pm - 11:09 pmSYD-STL

40h 19m2 stops

$1,295Cathay Pacific

Find Deal

Sat, Aug 23 - Mon, Sep 1

3:56 pm - 10:50 amSTL-SYD

51h 54m2 stops

9:50 pm - 8:25 pmSYD-STL

37h 35m2 stops

$1,299Cathay Pacific

Find Deal

Sun, Sep 14 - Sat, Sep 27

Air New Zealand flights from Illinois to Sydney

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

Air New Zealand

Nov 24

STL11:20 amLambert-St Louis

30h 10m

2 stops

SYD10:30 amSydney Kingsford Smith

Dec 8

SYD9:55 amSydney Kingsford Smith

47h 32m

2 stops

STL4:27 pmLambert-St Louis

$1,225

Find similar

Air New Zealand

Nov 5

STL8:20 amLambert-St Louis

44h 25m

2 stops

SYD9:45 pmSydney Kingsford Smith

Nov 23

SYD9:55 amSydney Kingsford Smith

29h 04m

2 stops

STL9:59 pmLambert-St Louis

$1,237

Find similar

Air New Zealand

Nov 28

STL6:15 amLambert-St Louis

37h 25m

2 stops

SYD12:40 pmSydney Kingsford Smith

Dec 14

SYD9:55 amSydney Kingsford Smith

29h 03m

2 stops

STL9:58 pmLambert-St Louis

$1,260

Find similar

Cathay Pacific flights from Illinois to Sydney

Our best Cathay Pacific deals on Illinois to Sydney flight tickets

Cathay Pacific

Aug 23

STL5:52 pmLambert-St Louis

45h 18m

2 stops

SYD6:10 amSydney Kingsford Smith

Sep 1

SYD9:50 pmSydney Kingsford Smith

40h 19m

2 stops

STL11:09 pmLambert-St Louis

$1,295

Find similar

Cathay Pacific

Sep 14

STL3:56 pmLambert-St Louis

51h 54m

2 stops

SYD10:50 amSydney Kingsford Smith

Sep 27

SYD9:50 pmSydney Kingsford Smith

37h 35m

2 stops

STL8:25 pmLambert-St Louis

$1,299

Find similar

Cathay Pacific

Aug 23

STL6:00 amLambert-St Louis

37h 50m

2 stops

SYD10:50 amSydney Kingsford Smith

Sep 1

SYD7:40 amSydney Kingsford Smith

54h 29m

2 stops

STL11:09 pmLambert-St Louis

$1,303

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 8/31

3:40 pm-7:20 am

1 stop24h 40m

Sydney Kingsford Smith

Sun 9/14

9:20 am-3:00 pm

1 stop20h 40m

$834

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 11/18

10:38 am-9:35 am

2 stops29h 57m

Sydney Kingsford Smith

Tue 2/24

11:20 am-8:05 am

2 stops37h 45m

$835

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 10/20

6:20 am-12:45 pm

2 stops38h 25m

Sydney Kingsford Smith

Sun 11/2

2:00 pm-11:59 pm

2 stops25h 59m

$962

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 2/1

1:30 pm-9:35 am

2 stops27h 05m

Sydney Kingsford Smith

Sun 2/15

11:20 am-3:29 pm

2 stops45h 09m

$1,006

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 2/1

5:54 pm-12:15 pm

2 stops25h 21m

Sydney Kingsford Smith

Sun 2/15

2:20 pm-4:06 pm

1 stop18h 46m

$1,082

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 11/28

4:07 pm-6:55 am

1 stop21h 48m

Sydney Kingsford Smith

Sun 12/14

7:20 am-11:40 am

2 stops21h 20m

$1,090

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 11/24

11:20 am-10:30 am

2 stops30h 10m

Sydney Kingsford Smith

Mon 12/8

9:55 am-4:27 pm

2 stops47h 32m

$1,225

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/5

8:20 am-9:45 pm

2 stops44h 25m

Sydney Kingsford Smith

Sun 11/23

9:55 am-9:59 pm

2 stops29h 04m

$1,237

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/23

5:52 pm-6:10 am

2 stops45h 18m

Sydney Kingsford Smith

Mon 9/1

9:50 pm-11:09 pm

2 stops40h 19m

$1,295

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 9/14

3:56 pm-10:50 am

2 stops51h 54m

Sydney Kingsford Smith

Sat 9/27

9:50 pm-8:25 pm

2 stops37h 35m

$1,299

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, August 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 $857. If you are unable to visit Sydney during the month of August, then departing from Illinois during the month May is also very affordable. Most momondo users find prices during this month for around $867.

What is the cheapest day to depart on your flight to Sydney?

The cheapest day to depart from Illinois to Sydney is on a Saturday when prices can be found for as low as $1,166. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,391.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the morning. momondo users have found flights departing from Illinois to Sydney in the morning for as low as $1,224. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly in the evening, with an average ticket price of $1,412. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight 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 $1,102 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 $911 on momondo.

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 2% 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

Best Price Found	$391
Fastest flight time	20h 13m
Direct flights	None
Airports in Sydney	1 airport

The best one-way flight to Sydney from Illinois in the past 72 hours is $391. The best round-trip flight deal from Illinois to Sydney found on momondo in the last 72 hours is $834.

The fastest flight from Illinois to Sydney takes 20h 13m

There are no direct flights from Illinois to Sydney. Popular non-direct routes for this connection are Chicago O'Hare Intl Airport - Sydney Kingsford Smith Airport and Lambert-St Louis Airport - Sydney Kingsford Smith Airport.

There is 1 airport near Sydney: Sydney Kingsford Smith (SYD)

Search flight deals

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 August 2025.
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
ANA	PriceFrom $679	Free Cancellation	Rating 8.4 924 reviews	Search ANA flights
Qantas Airways	PriceFrom $812	Free Cancellation	Rating 7.5 887 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $823	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $849	Free Cancellation	Rating 8.0 202 reviews	Search Fiji Airways flights
Delta	PriceFrom $851	Free Cancellation	Rating 8.0 7,985 reviews	Search Delta flights
United Airlines	PriceFrom $876	Free Cancellation	Rating 7.4 8,917 reviews	Search United Airlines flights
Air Canada	PriceFrom $1,013	Free Cancellation	Rating 7.1 9,893 reviews	Search Air Canada flights
Air New Zealand	PriceFrom $1,275	Free Cancellation	Rating 7.9 502 reviews	Search Air New Zealand flights

Parramatta

Bondi Beach

Katoomba

Wollongong

Randwick

Coogee

Cronulla

Penrith

Manly

Lithgow

Charlestown

Swansea

Leura

Terrigal

Why use momondo?

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 $391

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 9/18. 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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Big names and deals

Filter for what you want

Filter for what you want

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Find the cheapest flights from Illinois to Sydney

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Air New Zealand flights from Illinois to Sydney

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

Cathay Pacific flights from Illinois to Sydney

Our best Cathay Pacific deals on Illinois to Sydney flight tickets

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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

What is the cheapest month to fly to Sydney?

What is the cheapest day to depart on your flight to Sydney?

The cheapest day to depart from Illinois to Sydney is on a Saturday when prices can be found for as low as $1,166. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,391.

What is the cheapest time of day to depart on your flight to Sydney?

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

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 2% on your flight if you consider stops on a Illinois to Sydney flight.

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

Air Canada, Fiji Airways, and ANA are the most popular carriers operating 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

Best Price Found

Fastest flight time

Direct flights

Airports in Sydney

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

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

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

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

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?

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

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

How can momondo help me find flights 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?

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

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Australia

Airports servicing New South Wales