How long does it take to fly to Sydney?

If you’re flying from a popular airport in Illinois, such as Chicago or Peoria, and flying into Sydney, then you can expect flight times to average 26h 22m and 26h 34m, respectively.

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

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

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 refresh daily.

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

The number of operators available for flights from Illinois to Sydney Kingsford Smith Airport is 1 as of May 2026.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. 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 licence 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.

$832 Cheap Flights from Illinois to Sydney in 2026

1 adult

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Find the cheapest flights from Illinois to Sydney

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

18:13 - 20:50

STL

SYD

33h 37m

2 stops

11:15 - 23:42

SYD

STL

29h 27m

1 stop

$1,320Qantas Airways

Sun, 1 Nov - Sat, 14 Nov

07:00 - 09:00

STL

SYD

33h 00m

1 stop

17:50 - 12:37

SYD

STL

35h 47m

2 stops

$1,530Qantas Airways

Sat, 7 Nov - Thu, 12 Nov

21:07 - 07:30

ORD

SYD

43h 23m

1 stop

13:15 - 06:19

SYD

ORD

32h 04m

2 stops

$1,576Multiple Airlines

Sat, 22 Aug - Wed, 2 Sep

17:45 - 19:10

ORD

SYD

34h 25m

1 stop

11:45 - 14:55

SYD

ORD

42h 10m

1 stop

$1,616ANA

Sat, 22 Aug - Tue, 1 Sep

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,619Air New Zealand

Wed, 22 Jul - Sun, 30 Aug

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,620United Airlines

Wed, 22 Jul - Sun, 2 Aug

13:38 - 07:00

STL

SYD

26h 22m

2 stops

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,626Air New Zealand

Sun, 7 Jun - Sun, 14 Jun

06:00 - 07:00

STL

SYD

34h 00m

2 stops

10:20 - 21:26

SYD

STL

26h 06m

2 stops

$1,627United Airlines

Tue, 21 Jul - Wed, 29 Jul

21:07 - 07:30

ORD

SYD

43h 23m

1 stop

13:15 - 06:19

SYD

ORD

32h 04m

2 stops

$1,701Multiple Airlines

Tue, 18 Aug - Wed, 2 Sep

17:45 - 19:10

ORD

SYD

34h 25m

1 stop

11:45 - 04:45

SYD

ORD

32h 00m

2 stops

$1,733ANA

Tue, 1 Sep - Tue, 8 Sep

ANA flights from Illinois to Sydney

Our best ANA deals on Illinois to Sydney flight tickets

ANA

22 Aug

ORD19:50Chicago O'Hare Intl

32h 20m

2 stops

SYD19:10Sydney Kingsford Smith

1 Sept

SYD11:45Sydney Kingsford Smith

42h 10m

1 stop

ORD14:55Chicago O'Hare Intl

$1,616

ANA

1 Sept

ORD17:45Chicago O'Hare Intl

34h 25m

1 stop

SYD19:10Sydney Kingsford Smith

8 Sept

SYD11:45Sydney Kingsford Smith

32h 00m

2 stops

ORD04:45Chicago O'Hare Intl

$1,733

ANA

10 Sept

ORD17:45Chicago O'Hare Intl

34h 25m

1 stop

SYD19:10Sydney Kingsford Smith

8 Oct

SYD12:45Sydney Kingsford Smith

42h 10m

1 stop

ORD14:55Chicago O'Hare Intl

$1,752

Air Canada flights from Illinois to Sydney

Our best Air Canada deals on Illinois to Sydney flight tickets

Air Canada

22 July

STL08:55Lambert-St Louis

31h 25m

2 stops

SYD07:20Sydney Kingsford Smith

29 July

SYD09:20Sydney Kingsford Smith

24h 22m

2 stops

STL18:42Lambert-St Louis

$1,669

Air Canada

22 July

STL08:55Lambert-St Louis

31h 25m

2 stops

SYD07:20Sydney Kingsford Smith

29 July

SYD09:20Sydney Kingsford Smith

48h 22m

3 stops

STL18:42Lambert-St Louis

$1,682

Air Canada

17 May

STL07:05Lambert-St Louis

33h 15m

2 stops

SYD07:20Sydney Kingsford Smith

24 May

SYD09:20Sydney Kingsford Smith

22h 13m

2 stops

STL16:33Lambert-St Louis

$1,693

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/11

18:13-20:50

2 stops33h 37m

Sydney Kingsford Smith

Sat 14/11

11:15-23:42

1 stop29h 27m

$1,320

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/11

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Thu 12/11

17:50-12:37

2 stops35h 47m

$1,530

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 22/8

21:07-07:30

1 stop43h 23m

Sydney Kingsford Smith

Wed 2/9

13:15-06:19

2 stops32h 04m

$1,576

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 22/8

17:45-19:10

1 stop34h 25m

Sydney Kingsford Smith

Tue 1/9

11:45-14:55

1 stop42h 10m

$1,616

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Sun 30/8

10:20-18:39

1 stop23h 19m

$1,619

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Sun 2/8

10:20-18:17

1 stop22h 57m

$1,620

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 7/6

13:38-07:00

2 stops26h 22m

Sydney Kingsford Smith

Sun 14/6

10:20-18:17

1 stop22h 57m

$1,626

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 21/7

06:00-07:00

2 stops34h 00m

Sydney Kingsford Smith

Wed 29/7

10:20-21:26

2 stops26h 06m

$1,627

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 18/8

21:07-07:30

1 stop43h 23m

Sydney Kingsford Smith

Wed 2/9

13:15-06:19

2 stops32h 04m

$1,701

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 1/9

17:45-19:10

1 stop34h 25m

Sydney Kingsford Smith

Tue 8/9

11:45-04:45

2 stops32h 00m

$1,733

Flights are sorted by cheapest return 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?

The month of August is, on average, the cheapest month to fly to Sydney from Illinois, with most prices found around $193. If you aren’t able to travel to Sydney during the month of August, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $198.

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 $1,937 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Illinois for as low as $1,572 on momondo.

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 27% 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 refresh daily.
How many operators does momondo search for flights from Illinois to Sydney Kingsford Smith Airport?
The number of operators available for flights from Illinois to Sydney Kingsford Smith Airport is 1 as of May 2026.
How old do you have to be to fly from Illinois to Sydney Kingsford Smith Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. 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 licence 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
Qantas Airways	PriceFrom $2,051	Free cancellation	Rating 7.5 1,037 reviews		Search Qantas Airways flights

Parramatta

Wollongong

Terrigal

Penrith

Katoomba

Lithgow

Manly

Coogee

Leura

Bondi Beach

Cronulla

Randwick

Charlestown

Newport

Swansea

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to Sydney. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Illinois to Sydney flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Sydney from Illinois. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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.