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Cheap flights from Illinois to Sydney from $624

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 8/9. 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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Cheap return flights

Air Canada Logo
15:40 - 08:35ORD-SYD
24h 55m1 stop
Air Canada Logo
11:20 - 14:41SYD-ORD
20h 21m1 stop
$1,279Air Canada
Find Deal
Tue, 28 Oct - Wed, 19 Nov
Air Canada Logo
07:15 - 09:35ORD-SYD
33h 20m3 stops
Air Canada Logo
11:20 - 08:00SYD-ORD
37h 40m2 stops
$1,290Air Canada
Find Deal
Sun, 9 Nov - Wed, 19 Nov
Logo
13:35 - 09:35STL-SYD
27h 00m2 stops
Logo
11:20 - 15:29SYD-STL
45h 09m2 stops
$1,385
Find Deal
Tue, 11 Nov - Tue, 25 Nov
Logo
06:30 - 11:45ORD-SYD
38h 15m2 stops
Logo
13:15 - 22:43SYD-ORD
24h 28m2 stops
$1,486
Find Deal
Mon, 8 Sep - Thu, 25 Sep
Qantas Airways Logo
16:07 - 06:55STL-SYD
21h 48m1 stop
Qantas Airways Logo
07:20 - 16:07SYD-STL
25h 47m2 stops
$1,672Qantas Airways
Find Deal
Fri, 28 Nov - Sun, 14 Dec
Qantas Airways Logo
16:07 - 06:55STL-SYD
21h 48m1 stop
Qantas Airways Logo
06:05 - 16:07SYD-STL
27h 02m2 stops
$1,673Qantas Airways
Find Deal
Fri, 28 Nov - Sun, 14 Dec
ANA Logo
16:25 - 20:15ORD-SYD
34h 50m1 stop
ANA Logo
21:45 - 07:20SYD-ORD
26h 35m1 stop
$1,765ANA
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Mon, 2 Feb - Sun, 15 Feb
United Airlines Logo
06:00 - 06:55ORD-SYD
33h 55m3 stops
United Airlines Logo
10:20 - 22:47SYD-ORD
27h 27m2 stops
$1,770United Airlines
Find Deal
Wed, 24 Sep - Wed, 1 Oct
ANA Logo
16:25 - 20:15ORD-SYD
34h 50m1 stop
ANA Logo
12:25 - 05:03SYD-ORD
33h 38m2 stops
$1,779ANA
Find Deal
Mon, 2 Feb - Sun, 15 Feb
United Airlines Logo
16:17 - 07:00STL-SYD
21h 43m1 stop
United Airlines Logo
11:50 - 22:06SYD-STL
27h 16m1 stop
$2,085United Airlines
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Wed, 4 Feb - Sun, 15 Feb

Air Canada flights from Illinois to Sydney

Our best Air Canada deals on Illinois to Sydney flight tickets
Air Canada
28 Oct
ORD15:40Chicago O'Hare Intl
24h 55m
1 stop
SYD08:35Sydney Kingsford Smith
19 Nov
SYD11:20Sydney Kingsford Smith
20h 21m
1 stop
ORD14:41Chicago O'Hare Intl
$1,279
Find similar
Air Canada
9 Nov
ORD07:15Chicago O'Hare Intl
33h 20m
3 stops
SYD09:35Sydney Kingsford Smith
19 Nov
SYD11:20Sydney Kingsford Smith
37h 40m
2 stops
ORD08:00Chicago O'Hare Intl
$1,290
Find similar
Air Canada
30 Oct
ORD13:10Chicago O'Hare Intl
27h 25m
1 stop
SYD08:35Sydney Kingsford Smith
11 Nov
SYD11:20Sydney Kingsford Smith
37h 40m
2 stops
ORD08:00Chicago O'Hare Intl
$1,376
Find similar

Qantas Airways flights from Illinois to Sydney

Our best Qantas Airways deals on Illinois to Sydney flight tickets
Qantas Airways
28 Nov
STL16:07Lambert-St Louis
21h 48m
1 stop
SYD06:55Sydney Kingsford Smith
14 Dec
SYD07:20Sydney Kingsford Smith
25h 47m
2 stops
STL16:07Lambert-St Louis
$1,672
Find similar
Qantas Airways
28 Nov
STL16:07Lambert-St Louis
21h 48m
1 stop
SYD06:55Sydney Kingsford Smith
14 Dec
SYD06:05Sydney Kingsford Smith
27h 02m
2 stops
STL16:07Lambert-St Louis
$1,673
Find similar
Qantas Airways
3 Nov
STL07:00Lambert-St Louis
34h 55m
2 stops
SYD10:55Sydney Kingsford Smith
10 Nov
SYD14:20Sydney Kingsford Smith
22h 10m
1 stop
STL19:30Lambert-St Louis
$1,691
Find similar

momondo Fare Finder

 
Customise 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 78,305 searches. Data last updated 11 August 2025.
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

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 28/10

15:40-08:35

1 stop24h 55m

Sydney Kingsford Smith

Wed 19/11

11:20-14:41

1 stop20h 21m

$1,279

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 9/11

07:15-09:35

3 stops33h 20m

Sydney Kingsford Smith

Wed 19/11

11:20-08:00

2 stops37h 40m

$1,290

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 11/11

13:35-09:35

2 stops27h 00m

Sydney Kingsford Smith

Tue 25/11

11:20-15:29

2 stops45h 09m

$1,385

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 8/9

06:30-11:45

2 stops38h 15m

Sydney Kingsford Smith

Thu 25/9

13:15-22:43

2 stops24h 28m

$1,486

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

16:07-06:55

1 stop21h 48m

Sydney Kingsford Smith

Sun 14/12

07:20-16:07

2 stops25h 47m

$1,672

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

16:07-06:55

1 stop21h 48m

Sydney Kingsford Smith

Sun 14/12

06:05-16:07

2 stops27h 02m

$1,673

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 2/2

16:25-20:15

1 stop34h 50m

Sydney Kingsford Smith

Sun 15/2

21:45-07:20

1 stop26h 35m

$1,765

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 24/9

06:00-06:55

3 stops33h 55m

Sydney Kingsford Smith

Wed 1/10

10:20-22:47

2 stops27h 27m

$1,770

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 2/2

16:25-20:15

1 stop34h 50m

Sydney Kingsford Smith

Sun 15/2

12:25-05:03

2 stops33h 38m

$1,779

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/2

16:17-07:00

1 stop21h 43m

Sydney Kingsford Smith

Sun 15/2

11:50-22:06

1 stop27h 16m

$2,085

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

The month of August is, on average, the cheapest month to fly to Sydney from Illinois, with most prices found around $1,313. 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 $1,328.

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

Our data shows that Sunday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $1,808. The most expensive day to fly to Sydney is Tuesday, with ticket prices averaging around $2,484.

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 afternoon. momondo users have found flights departing from Illinois to Sydney in the afternoon for as low as $2,116. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying at midday when prices are $3,234 on average. Flights to Sydney from Illinois at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 $1,678 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 $1,327 on momondo.

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 11% 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

$624

Fastest flight time

19h 56m

Direct flights

None

Airports in Sydney

1 airport
The best one-way flight to Sydney from Illinois in the past 72 hours is $624. The best return flight deal from Illinois to Sydney found on momondo in the last 72 hours is $1,279.
The fastest flight from Illinois to Sydney takes 19h 56m
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, Lambert-St Louis Airport - Sydney Kingsford Smith Airport and Chicago Midway 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 refresh 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?

    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
Air CanadaPriceFrom $1,274Free cancellationRating
7.1
9,915 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $1,308Free cancellationRating
7.5
893 reviews
Search Qantas Airways flights

Travelling to a place near Sydney?

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

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