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 24h 42m and 26h 04m, respectively.

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

Delta, Qantas Airways, and Air New Zealand 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 July 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.

$693 Cheap Flights from Illinois to Sydney in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Sydney

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

09:20 - 11:50

ORD

SYD

35h 30m

3 stops

13:15 - 05:59

SYD

ORD

31h 44m

2 stops

$1,431Multiple Airlines

Wed, 12 Aug - Wed, 19 Aug

09:20 - 11:50

ORD

SYD

35h 30m

3 stops

13:15 - 05:59

SYD

ORD

31h 44m

2 stops

$1,470Multiple Airlines

Thu, 13 Aug - Thu, 20 Aug

09:20 - 11:50

ORD

SYD

35h 30m

3 stops

13:15 - 00:49

SYD

ORD

50h 34m

3 stops

$1,520Multiple Airlines

Wed, 12 Aug - Wed, 19 Aug

15:32 - 06:55

STL

SYD

24h 23m

1 stop

12:00 - 18:05

SYD

STL

21h 05m

1 stop

$1,659Qantas Airways

Mon, 17 Aug - Mon, 24 Aug

06:00 - 07:30

STL

SYD

34h 30m

1 stop

09:10 - 22:59

SYD

STL

28h 49m

1 stop

$1,667Qantas Airways

Mon, 10 Aug - Mon, 17 Aug

08:42 - 06:55

STL

SYD

31h 13m

1 stop

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,701Air New Zealand

Wed, 12 Aug - Wed, 19 Aug

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 20:46

SYD

STL

25h 26m

2 stops

$1,703Air New Zealand

Mon, 10 Aug - Mon, 17 Aug

16:48 - 07:00

STL

SYD

23h 12m

2 stops

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,716United Airlines

Mon, 10 Aug - Mon, 17 Aug

13:38 - 07:00

STL

SYD

26h 22m

2 stops

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,722United Airlines

Mon, 10 Aug - Mon, 17 Aug

16:43 - 09:45

PIA

SYD

26h 02m

2 stops

12:00 - 23:19

SYD

PIA

26h 19m

1 stop

$1,821American Airlines

Wed, 26 Aug - Mon, 7 Sep

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Qantas Airways flights from Illinois to Sydney

Our best Qantas Airways deals on Illinois to Sydney flight tickets

Qantas Airways

17 Aug

STL15:32Lambert-St Louis

24h 23m

1 stop

SYD06:55Sydney Kingsford Smith

24 Aug

SYD12:00Sydney Kingsford Smith

21h 05m

1 stop

STL18:05Lambert-St Louis

$1,659

Qantas Airways

10 Aug

STL06:00Lambert-St Louis

34h 30m

1 stop

SYD07:30Sydney Kingsford Smith

17 Aug

SYD09:10Sydney Kingsford Smith

28h 49m

1 stop

STL22:59Lambert-St Louis

$1,667

Qantas Airways

22 Aug

STL17:11Lambert-St Louis

22h 44m

1 stop

SYD06:55Sydney Kingsford Smith

8 Sept

SYD17:50Sydney Kingsford Smith

20h 09m

1 stop

STL22:59Lambert-St Louis

$1,728

Delta flights from Illinois to Sydney

Our best Delta deals on Illinois to Sydney flight tickets

Delta

8 Aug

STL17:00Lambert-St Louis

46h 50m

2 stops

SYD06:50Sydney Kingsford Smith

19 Aug

SYD09:15Sydney Kingsford Smith

24h 40m

2 stops

STL18:55Lambert-St Louis

$1,744

Delta

8 Aug

STL17:00Lambert-St Louis

46h 50m

2 stops

SYD06:50Sydney Kingsford Smith

16 Aug

SYD09:15Sydney Kingsford Smith

54h 26m

2 stops

STL00:41Lambert-St Louis

$1,767

Delta

8 Aug

STL17:00Lambert-St Louis

46h 50m

2 stops

SYD06:50Sydney Kingsford Smith

20 Aug

SYD09:15Sydney Kingsford Smith

24h 40m

2 stops

STL18:55Lambert-St Louis

$1,816

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 12/8

09:20-11:50

3 stops35h 30m

Sydney Kingsford Smith

Wed 19/8

13:15-05:59

2 stops31h 44m

$1,431

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 13/8

09:20-11:50

3 stops35h 30m

Sydney Kingsford Smith

Thu 20/8

13:15-05:59

2 stops31h 44m

$1,470

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 12/8

09:20-11:50

3 stops35h 30m

Sydney Kingsford Smith

Wed 19/8

13:15-00:49

3 stops50h 34m

$1,520

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 17/8

15:32-06:55

1 stop24h 23m

Sydney Kingsford Smith

Mon 24/8

12:00-18:05

1 stop21h 05m

$1,659

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

06:00-07:30

1 stop34h 30m

Sydney Kingsford Smith

Mon 17/8

09:10-22:59

1 stop28h 49m

$1,667

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Wed 19/8

10:20-18:39

1 stop23h 19m

$1,701

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Mon 17/8

10:20-20:46

2 stops25h 26m

$1,703

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

16:48-07:00

2 stops23h 12m

Sydney Kingsford Smith

Mon 17/8

10:20-18:39

1 stop23h 19m

$1,716

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

13:38-07:00

2 stops26h 22m

Sydney Kingsford Smith

Mon 17/8

10:20-18:39

1 stop23h 19m

$1,722

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Wed 26/8

16:43-09:45

2 stops26h 02m

Sydney Kingsford Smith

Mon 7/9

12:00-23:19

1 stop26h 19m

$1,821

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 May is, on average, the cheapest month to fly to Sydney from Illinois, with most prices found around $206. If you aren’t able to travel to Sydney during the month of May, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $211.

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 $2,044 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 $1,670 on momondo.

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.

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 July 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 $2,127	Free cancellation	Rating 7.5 1,056 reviews		Search Qantas Airways flights

Parramatta

Wollongong

Terrigal

Penrith

Katoomba

Manly

Coogee

Leura

Lithgow

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.