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Cheap flights from Illinois to Sydney from $642

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 8/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Illinois to Sydney

Cheap round-trip flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
7:00 am - 9:00 am
STL
-
SYD
33h 00m
1 stop
Qantas Airways Logo
7:15 pm - 12:37 pm
SYD
-
STL
34h 22m
2 stops
$1,021Qantas Airways
Sat, Nov 7 - Thu, Nov 19
Air New Zealand Logo
7:23 pm - 6:55 am
STL
-
SYD
20h 32m
1 stop
Air New Zealand Logo
10:20 am - 6:39 pm
SYD
-
STL
23h 19m
1 stop
$1,160Air New Zealand
Wed, Jul 22 - Sun, Aug 30
United Airlines Logo
7:23 pm - 6:55 am
STL
-
SYD
20h 32m
1 stop
United Airlines Logo
10:20 am - 6:17 pm
SYD
-
STL
22h 57m
1 stop
$1,161United Airlines
Wed, Jul 22 - Sun, Aug 2
United Airlines Logo
9:15 am - 7:00 am
STL
-
SYD
30h 45m
2 stops
United Airlines Logo
10:20 am - 6:39 pm
SYD
-
STL
23h 19m
1 stop
$1,166United Airlines
Tue, Jul 21 - Sun, Aug 30
ANA Logo
5:45 pm - 7:10 pm
ORD
-
SYD
34h 25m
1 stop
ANA Logo
11:45 am - 4:45 am
SYD
-
ORD
32h 00m
2 stops
$1,277ANA
Wed, Aug 5 - Sun, Aug 30
Multiple Airlines Logo
9:13 pm - 7:30 am
ORD
-
SYD
43h 17m
1 stop
Multiple Airlines Logo
1:15 pm - 6:19 am
SYD
-
ORD
32h 04m
2 stops
$1,312Multiple Airlines
Sat, Aug 1 - Tue, Aug 18
ANA Logo
5:45 pm - 7:10 pm
ORD
-
SYD
34h 25m
1 stop
ANA Logo
11:45 am - 8:33 pm
SYD
-
ORD
47h 48m
2 stops
$1,323ANA
Wed, Aug 5 - Sun, Aug 30
Air Canada Logo
3:40 pm - 7:20 am
ORD
-
SYD
24h 40m
1 stop
Air Canada Logo
9:20 am - 2:41 pm
SYD
-
ORD
20h 21m
1 stop
$1,337Air Canada
Mon, Jun 22 - Wed, Jul 8
Air Canada Logo
3:40 pm - 7:20 am
ORD
-
SYD
24h 40m
1 stop
Air Canada Logo
9:20 am - 2:41 pm
SYD
-
ORD
20h 21m
1 stop
$1,343Air Canada
Mon, Jun 22 - Wed, Jul 8
Multiple Airlines Logo
9:13 pm - 7:30 am
ORD
-
SYD
43h 17m
1 stop
Multiple Airlines Logo
1:15 pm - 6:19 am
SYD
-
ORD
32h 04m
2 stops
$1,347Multiple Airlines
Sun, Aug 9 - Sun, Aug 23

ANA flights from Illinois to Sydney

Our best ANA deals on Illinois to Sydney flight tickets
ANA
Aug 5
ORD5:45 pmChicago O'Hare Intl
34h 25m
1 stop
SYD7:10 pmSydney Kingsford Smith
Aug 30
SYD11:45 amSydney Kingsford Smith
32h 00m
2 stops
ORD4:45 amChicago O'Hare Intl
$1,277
ANA
Aug 5
ORD5:45 pmChicago O'Hare Intl
34h 25m
1 stop
SYD7:10 pmSydney Kingsford Smith
Aug 30
SYD11:45 amSydney Kingsford Smith
47h 48m
2 stops
ORD8:33 pmChicago O'Hare Intl
$1,323
ANA
Aug 10
ORD8:18 pmChicago O'Hare Intl
31h 52m
2 stops
SYD7:10 pmSydney Kingsford Smith
Aug 23
SYD11:45 amSydney Kingsford Smith
47h 41m
2 stops
ORD8:26 pmChicago O'Hare Intl
$1,328

Air Canada flights from Illinois to Sydney

Our best Air Canada deals on Illinois to Sydney flight tickets
Air Canada
May 17
STL7:05 amLambert-St Louis
33h 15m
2 stops
SYD7:20 amSydney Kingsford Smith
May 24
SYD9:20 amSydney Kingsford Smith
22h 13m
2 stops
STL4:33 pmLambert-St Louis
$1,213
Air Canada
Jul 20
STL4:48 pmLambert-St Louis
23h 32m
2 stops
SYD7:20 amSydney Kingsford Smith
Jul 26
SYD9:20 amSydney Kingsford Smith
48h 22m
2 stops
STL6:42 pmLambert-St Louis
$1,299
Air Canada
Jul 20
STL4:48 pmLambert-St Louis
23h 32m
2 stops
SYD7:20 amSydney Kingsford Smith
Jul 28
SYD9:20 amSydney Kingsford Smith
26h 02m
2 stops
STL8:22 pmLambert-St Louis
$1,304

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Sydney that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated May 12, 2026.
Use the filters below to find and compare flights from Illinois to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 11/7

7:00 am-9:00 am

1 stop33h 00m

Sydney Kingsford Smith

Thu 11/19

7:15 pm-12:37 pm

2 stops34h 22m

$1,021

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 7/22

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Sun 8/30

10:20 am-6:39 pm

1 stop23h 19m

$1,160
Quickest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 7/22

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Sun 8/2

10:20 am-6:17 pm

1 stop22h 57m

$1,161

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 7/21

9:15 am-7:00 am

2 stops30h 45m

Sydney Kingsford Smith

Sun 8/30

10:20 am-6:39 pm

1 stop23h 19m

$1,166

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 8/5

5:45 pm-7:10 pm

1 stop34h 25m

Sydney Kingsford Smith

Sun 8/30

11:45 am-4:45 am

2 stops32h 00m

$1,277

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 8/1

9:13 pm-7:30 am

1 stop43h 17m

Sydney Kingsford Smith

Tue 8/18

1:15 pm-6:19 am

2 stops32h 04m

$1,312

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 8/5

5:45 pm-7:10 pm

1 stop34h 25m

Sydney Kingsford Smith

Sun 8/30

11:45 am-8:33 pm

2 stops47h 48m

$1,323

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 6/22

3:40 pm-7:20 am

1 stop24h 40m

Sydney Kingsford Smith

Wed 7/8

9:20 am-2:41 pm

1 stop20h 21m

$1,337

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 6/22

3:40 pm-7:20 am

1 stop24h 40m

Sydney Kingsford Smith

Wed 7/8

9:20 am-2:41 pm

1 stop20h 21m

$1,343

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 8/9

9:13 pm-7:30 am

1 stop43h 17m

Sydney Kingsford Smith

Sun 8/23

1:15 pm-6:19 am

2 stops32h 04m

$1,347

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Sydney from

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?

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 $138. 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 $142.

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 $1,388 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 $1,126 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

20h 32m

Direct flights

None
The fastest flight from Illinois to Sydney takes 20h 32m
There are no direct flights from Illinois to Sydney. There are no popular flight routes from Illinois to Sydney.
Search flight deals

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?

  • 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 AirlinesPriceFrom $198Free CancellationRating
7.1
11,665 reviews
Search American Airlines flights
Fiji AirwaysPriceFrom $716Free CancellationRating
8.1
241 reviews
Search Fiji Airways flights
Qantas AirwaysPriceFrom $836Free CancellationRating
7.5
1,037 reviews
Search Qantas Airways flights
United AirlinesPriceFrom $870Free CancellationRating
7.4
9,704 reviews
Search United Airlines flights
Air CanadaPriceFrom $898Free CancellationRating
7.1
11,026 reviews
Search Air Canada flights
ANAPriceFrom $1,193Free CancellationRating
8.3
1,208 reviews
Search ANA flights
Air New ZealandPriceFrom $1,282Free CancellationRating
8.0
642 reviews
Search Air New Zealand flights

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Bondi Beach
Katoomba
Wollongong
Penrith
Leura
Randwick
Lithgow
Manly
Coogee
Cronulla
Terrigal
Charlestown
Swansea

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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