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Cheap flights from Illinois to Sydney from $767

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 8/11. 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

Multiple Airlines Logo
06:15 - 07:00MDW-SYD
31h 45m2 stops
Multiple Airlines Logo
12:10 - 21:35SYD-MDW
26h 25m2 stops
$1,511Multiple Airlines
Find Deal
Sat, 8 Nov - Sat, 15 Nov
Qantas Airways Logo
06:39 - 09:00STL-SYD
34h 21m1 stop
Qantas Airways Logo
17:50 - 15:29SYD-STL
38h 39m2 stops
$1,518Qantas Airways
Find Deal
Wed, 29 Oct - Thu, 13 Nov
Alaska Airlines Logo
10:00 - 19:45ORD-SYD
40h 45m2 stops
Alaska Airlines Logo
21:40 - 16:30SYD-ORD
35h 50m2 stops
$1,610Alaska Airlines
Find Deal
Wed, 12 Nov - Tue, 18 Nov
Alaska Airlines Logo
10:05 - 19:45ORD-SYD
41h 40m2 stops
Alaska Airlines Logo
21:40 - 21:40SYD-ORD
40h 00m2 stops
$1,627Alaska Airlines
Find Deal
Tue, 21 Oct - Tue, 28 Oct
Hawaiian Airlines Logo
14:00 - 19:45ORD-SYD
36h 45m2 stops
Hawaiian Airlines Logo
21:40 - 13:04SYD-ORD
32h 24m2 stops
$1,671Hawaiian Airlines
Find Deal
Wed, 14 Jan - Mon, 26 Jan
Fiji Airways Logo
16:45 - 12:30ORD-SYD
26h 45m2 stops
Fiji Airways Logo
14:10 - 19:18SYD-ORD
22h 08m2 stops
$1,699Fiji Airways
Find Deal
Sat, 28 Feb - Sat, 7 Mar
Hawaiian Airlines Logo
14:00 - 19:45ORD-SYD
36h 45m2 stops
Hawaiian Airlines Logo
21:40 - 13:04SYD-ORD
32h 24m2 stops
$1,700Hawaiian Airlines
Find Deal
Sat, 24 Jan - Fri, 13 Feb
Air Canada Logo
09:00 - 08:35STL-SYD
31h 35m2 stops
Air Canada Logo
11:20 - 21:54SYD-STL
27h 34m2 stops
$1,816Air Canada
Find Deal
Sun, 26 Oct - Tue, 11 Nov
Air Canada Logo
16:05 - 09:35STL-SYD
48h 30m2 stops
Air Canada Logo
11:20 - 15:29SYD-STL
45h 09m2 stops
$1,837Air Canada
Find Deal
Sun, 9 Nov - Sun, 16 Nov
Fiji Airways Logo
16:45 - 21:50ORD-SYD
36h 05m2 stops
Fiji Airways Logo
14:10 - 19:18SYD-ORD
22h 08m2 stops
$1,855Fiji Airways
Find Deal
Sat, 7 Feb - Sat, 21 Feb

American Airlines flights from Illinois to Sydney

Our best American Airlines deals on Illinois to Sydney flight tickets
American Airlines
8 Nov
STL07:00Lambert-St Louis
31h 25m
1 stop
SYD07:25Sydney Kingsford Smith
15 Nov
SYD17:45Sydney Kingsford Smith
22h 57m
1 stop
STL23:42Lambert-St Louis
$2,050
Find similar
American Airlines
7 Nov
STL07:00Lambert-St Louis
33h 00m
1 stop
SYD09:00Sydney Kingsford Smith
14 Nov
SYD14:05Sydney Kingsford Smith
19h 22m
1 stop
STL16:27Lambert-St Louis
$2,055
Find similar
American Airlines
28 Sept
STL13:53Lambert-St Louis
25h 12m
2 stops
SYD06:05Sydney Kingsford Smith
5 Oct
SYD18:45Sydney Kingsford Smith
20h 14m
1 stop
STL22:59Lambert-St Louis
$2,056
Find similar

United Airlines flights from Illinois to Sydney

Our best United Airlines deals on Illinois to Sydney flight tickets
United Airlines
1 Nov
PIA13:20Greater Peoria
27h 45m
2 stops
SYD09:05Sydney Kingsford Smith
14 Nov
SYD11:20Sydney Kingsford Smith
27h 11m
2 stops
PIA21:31Greater Peoria
$1,880
Find similar
United Airlines
5 Nov
STL16:35Lambert-St Louis
21h 25m
1 stop
SYD07:00Sydney Kingsford Smith
23 Nov
SYD12:10Sydney Kingsford Smith
21h 17m
1 stop
STL16:27Lambert-St Louis
$1,967
Find similar
United Airlines
28 Sept
STL16:50Lambert-St Louis
23h 05m
2 stops
SYD06:55Sydney Kingsford Smith
5 Oct
SYD10:30Sydney Kingsford Smith
24h 27m
2 stops
STL18:57Lambert-St Louis
$1,974
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 26 September 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

MDW - SYD

MDWSYD

Chicago Midway

Sat 8/11

06:15-07:00

2 stops31h 45m

Sydney Kingsford Smith

Sat 15/11

12:10-21:35

2 stops26h 25m

$1,511

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 29/10

06:39-09:00

1 stop34h 21m

Sydney Kingsford Smith

Thu 13/11

17:50-15:29

2 stops38h 39m

$1,518

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 12/11

10:00-19:45

2 stops40h 45m

Sydney Kingsford Smith

Tue 18/11

21:40-16:30

2 stops35h 50m

$1,610

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 21/10

10:05-19:45

2 stops41h 40m

Sydney Kingsford Smith

Tue 28/10

21:40-21:40

2 stops40h 00m

$1,627

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 14/1

14:00-19:45

2 stops36h 45m

Sydney Kingsford Smith

Mon 26/1

21:40-13:04

2 stops32h 24m

$1,671

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 28/2

16:45-12:30

2 stops26h 45m

Sydney Kingsford Smith

Sat 7/3

14:10-19:18

2 stops22h 08m

$1,699

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 24/1

14:00-19:45

2 stops36h 45m

Sydney Kingsford Smith

Fri 13/2

21:40-13:04

2 stops32h 24m

$1,700

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 26/10

09:00-08:35

2 stops31h 35m

Sydney Kingsford Smith

Tue 11/11

11:20-21:54

2 stops27h 34m

$1,816

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 9/11

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Sun 16/11

11:20-15:29

2 stops45h 09m

$1,837

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 7/2

16:45-21:50

2 stops36h 05m

Sydney Kingsford Smith

Sat 21/2

14:10-19:18

2 stops22h 08m

$1,855

Flights are sorted by cheapest return 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?

The month of August is, on average, the cheapest month to fly to Sydney from Illinois, with most prices found around $1,295. 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 $1,320.

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 $1,797. The most expensive day to fly to Sydney is Tuesday, with ticket prices averaging around $2,467.

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 $2,102. 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 $3,213 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 $1,687 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 $1,308 on momondo.

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 15% 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

Direct flights

None
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
Air CanadaPriceFrom $1,265Free cancellationRating
7.1
10,000 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $1,330Free cancellationRating
7.5
908 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
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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