Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Illinois to Sydney from $784

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 21/2. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Illinois to Sydney

Cheap return flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
18:40 - 20:50
ORD
-
SYD
33h 10m2 stops
Qantas Airways Logo
11:20 - 16:38
SYD
-
ORD
22h 18m1 stop
$1,313Qantas Airways
Mon, 9 Feb - Mon, 2 Mar
Qantas Airways Logo
15:10 - 20:50
ORD
-
SYD
36h 40m2 stops
Qantas Airways Logo
11:20 - 14:04
SYD
-
ORD
19h 44m1 stop
$1,314Qantas Airways
Mon, 9 Feb - Mon, 2 Mar
Multiple Airlines Logo
09:45 - 07:25
MDW
-
SYD
28h 40m2 stops
Multiple Airlines Logo
11:20 - 22:19
SYD
-
MDW
27h 59m2 stops
$1,778Multiple Airlines
Mon, 26 Jan - Mon, 9 Feb
Multiple Airlines Logo
06:15 - 07:25
MDW
-
SYD
32h 10m2 stops
Multiple Airlines Logo
11:20 - 11:27
SYD
-
MDW
41h 07m2 stops
$1,785Multiple Airlines
Wed, 11 Feb - Wed, 18 Feb
Delta Logo
13:10 - 07:25
MDW
-
SYD
26h 15m2 stops
Delta Logo
10:15 - 18:40
SYD
-
MDW
24h 25m2 stops
$2,188Delta
Sun, 15 Mar - Sun, 29 Mar
Delta Logo
14:05 - 07:25
MDW
-
SYD
25h 20m2 stops
Delta Logo
09:15 - 22:31
SYD
-
MDW
28h 16m2 stops
$2,189Delta
Wed, 25 Mar - Sun, 5 Apr
United Airlines Logo
08:50 - 07:55
PIA
-
SYD
31h 05m2 stops
United Airlines Logo
10:20 - 16:44
SYD
-
PIA
21h 24m2 stops
$2,191United Airlines
Fri, 3 Apr - Tue, 7 Apr
United Airlines Logo
13:24 - 09:05
PIA
-
SYD
26h 41m2 stops
United Airlines Logo
11:50 - 16:50
SYD
-
PIA
22h 00m2 stops
$2,192United Airlines
Mon, 9 Feb - Mon, 16 Feb
American Airlines Logo
07:00 - 06:55
PIA
-
SYD
30h 55m1 stop
American Airlines Logo
14:05 - 22:50
SYD
-
PIA
25h 45m1 stop
$2,383American Airlines
Mon, 9 Feb - Mon, 16 Feb
American Airlines Logo
11:10 - 09:00
PIA
-
SYD
28h 50m2 stops
American Airlines Logo
14:05 - 16:36
SYD
-
PIA
19h 31m1 stop
$2,387American Airlines
Mon, 9 Feb - Mon, 16 Feb

Delta flights from Illinois to Sydney

Our best Delta deals on Illinois to Sydney flight tickets
Delta
15 Mar
MDW13:10Chicago Midway
26h 15m
2 stops
SYD07:25Sydney Kingsford Smith
29 Mar
SYD10:15Sydney Kingsford Smith
24h 25m
2 stops
MDW18:40Chicago Midway
$2,188
Find similar
Delta
25 Mar
MDW14:05Chicago Midway
25h 20m
2 stops
SYD07:25Sydney Kingsford Smith
5 Apr
SYD09:15Sydney Kingsford Smith
28h 16m
2 stops
MDW22:31Chicago Midway
$2,189
Find similar
Delta
1 Mar
MDW13:28Chicago Midway
24h 22m
2 stops
SYD06:50Sydney Kingsford Smith
14 Mar
SYD13:15Sydney Kingsford Smith
25h 16m
2 stops
MDW22:31Chicago Midway
$2,262
Find similar

Qantas Airways flights from Illinois to Sydney

Our best Qantas Airways deals on Illinois to Sydney flight tickets
Qantas Airways
9 Feb
ORD18:40Chicago O'Hare Intl
33h 10m
2 stops
SYD20:50Sydney Kingsford Smith
2 Mar
SYD11:20Sydney Kingsford Smith
22h 18m
1 stop
ORD16:38Chicago O'Hare Intl
$1,313
Find similar
Qantas Airways
9 Feb
ORD15:10Chicago O'Hare Intl
36h 40m
2 stops
SYD20:50Sydney Kingsford Smith
2 Mar
SYD11:20Sydney Kingsford Smith
19h 44m
1 stop
ORD14:04Chicago O'Hare Intl
$1,314
Find similar
Qantas Airways
10 Feb
STL07:04Lambert-St Louis
32h 56m
1 stop
SYD09:00Sydney Kingsford Smith
17 Feb
SYD07:05Sydney Kingsford Smith
33h 43m
2 stops
STL23:48Lambert-St Louis
$1,368
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 27 December 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

Mon 9/2

18:40-20:50

2 stops33h 10m

Sydney Kingsford Smith

Mon 2/3

11:20-16:38

1 stop22h 18m

$1,313

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 9/2

15:10-20:50

2 stops36h 40m

Sydney Kingsford Smith

Mon 2/3

11:20-14:04

1 stop19h 44m

$1,314

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Mon 26/1

09:45-07:25

2 stops28h 40m

Sydney Kingsford Smith

Mon 9/2

11:20-22:19

2 stops27h 59m

$1,778

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Wed 11/2

06:15-07:25

2 stops32h 10m

Sydney Kingsford Smith

Wed 18/2

11:20-11:27

2 stops41h 07m

$1,785

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Sun 15/3

13:10-07:25

2 stops26h 15m

Sydney Kingsford Smith

Sun 29/3

10:15-18:40

2 stops24h 25m

$2,188

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Wed 25/3

14:05-07:25

2 stops25h 20m

Sydney Kingsford Smith

Sun 5/4

09:15-22:31

2 stops28h 16m

$2,189

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Fri 3/4

08:50-07:55

2 stops31h 05m

Sydney Kingsford Smith

Tue 7/4

10:20-16:44

2 stops21h 24m

$2,191

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Mon 9/2

13:24-09:05

2 stops26h 41m

Sydney Kingsford Smith

Mon 16/2

11:50-16:50

2 stops22h 00m

$2,192

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Mon 9/2

07:00-06:55

1 stop30h 55m

Sydney Kingsford Smith

Mon 16/2

14:05-22:50

1 stop25h 45m

$2,383

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Mon 9/2

11:10-09:00

2 stops28h 50m

Sydney Kingsford Smith

Mon 16/2

14:05-16:36

1 stop19h 31m

$2,387

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 $1,271. If you aren’t able to travel to Sydney during the month of August, then flying in June is also cheap. Prices for this month can be found on momondo for an average of $1,286.

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 $1,759. The most expensive day to fly to Sydney is Tuesday, with ticket prices averaging around $2,416.

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 $2,058. 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 $3,146 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 $1,597 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 $1,268 on momondo.

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 37% 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

21h 20m

Direct flights

None
The fastest flight from Illinois to Sydney takes 21h 20m
There are no direct flights from Illinois to Sydney. There are no popular flight routes from Illinois to Sydney.
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
Qantas AirwaysPriceFrom $1,302Free cancellationRating
7.5
956 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
Penrith
Katoomba
Lithgow
Leura
Manly
Bondi Beach
Coogee
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.

An easier way to manage your Sydney trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 26/1
Mon 2/2
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Australia