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Cheap flights from Illinois to Sydney from $620

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 9/4. 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

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Find the cheapest flights from Illinois to Sydney

Cheap return flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
18:50 - 20:50
STL
-
SYD
34h 00m
2 stops
Qantas Airways Logo
11:20 - 23:58
SYD
-
STL
28h 38m
1 stop
$1,287Qantas Airways
Mon, 9 Mar - Mon, 16 Mar
Qantas Airways Logo
18:50 - 20:50
STL
-
SYD
34h 00m
2 stops
Qantas Airways Logo
18:50 - 23:58
SYD
-
STL
21h 08m
1 stop
$1,298Qantas Airways
Mon, 23 Mar - Mon, 30 Mar
Multiple Airlines Logo
19:29 - 07:30
ORD
-
SYD
44h 01m
1 stop
Multiple Airlines Logo
13:15 - 05:39
SYD
-
ORD
31h 24m
2 stops
$1,348Multiple Airlines
Tue, 31 Mar - Mon, 13 Apr
Multiple Airlines Logo
19:29 - 07:30
ORD
-
SYD
44h 01m
1 stop
Multiple Airlines Logo
13:15 - 05:39
SYD
-
ORD
31h 24m
2 stops
$1,354Multiple Airlines
Tue, 31 Mar - Mon, 13 Apr
Air Canada Logo
16:05 - 09:35
STL
-
SYD
48h 30m
2 stops
Air Canada Logo
10:20 - 15:29
SYD
-
STL
45h 09m
2 stops
$1,633Air Canada
Wed, 4 Mar - Tue, 10 Mar
Air Canada Logo
13:00 - 07:20
STL
-
SYD
27h 20m
2 stops
Air Canada Logo
09:20 - 20:05
SYD
-
STL
49h 45m
2 stops
$1,643Air Canada
Mon, 4 May - Mon, 18 May
United Airlines Logo
08:50 - 07:00
PIA
-
SYD
31h 10m
2 stops
United Airlines Logo
09:30 - 21:16
SYD
-
PIA
26h 46m
2 stops
$1,812United Airlines
Sat, 11 Jul - Fri, 14 Aug
United Airlines Logo
10:42 - 06:55
PIA
-
SYD
29h 13m
2 stops
United Airlines Logo
10:20 - 00:14
SYD
-
PIA
28h 54m
2 stops
$1,886United Airlines
Sat, 11 Jul - Fri, 14 Aug
Delta Logo
14:05 - 07:30
MDW
-
SYD
25h 25m
2 stops
Delta Logo
09:40 - 17:22
SYD
-
MDW
23h 42m
2 stops
$1,976Delta
Tue, 10 Mar - Sun, 15 Mar
Delta Logo
14:00 - 06:50
MDW
-
SYD
25h 50m
2 stops
Delta Logo
09:15 - 18:05
SYD
-
MDW
23h 50m
2 stops
$1,978Delta
Wed, 5 Aug - Wed, 26 Aug

Delta flights from Illinois to Sydney

Our best Delta deals on Illinois to Sydney flight tickets
Delta
10 Mar
MDW14:05Chicago Midway
25h 25m
2 stops
SYD07:30Sydney Kingsford Smith
15 Mar
SYD09:40Sydney Kingsford Smith
23h 42m
2 stops
MDW17:22Chicago Midway
$1,976
Delta
5 Aug
MDW14:00Chicago Midway
25h 50m
2 stops
SYD06:50Sydney Kingsford Smith
26 Aug
SYD09:15Sydney Kingsford Smith
23h 50m
2 stops
MDW18:05Chicago Midway
$1,978
Delta
22 Feb
MDW12:45Chicago Midway
25h 05m
2 stops
SYD06:50Sydney Kingsford Smith
6 Mar
SYD10:40Sydney Kingsford Smith
24h 05m
2 stops
MDW17:45Chicago Midway
$2,047

Qantas Airways flights from Illinois to Sydney

Our best Qantas Airways deals on Illinois to Sydney flight tickets
Qantas Airways
11 Feb
STL07:04Lambert-St Louis
32h 56m
1 stop
SYD09:00Sydney Kingsford Smith
20 Feb
SYD07:05Sydney Kingsford Smith
33h 54m
2 stops
STL23:59Lambert-St Louis
$1,271
Qantas Airways
9 Mar
STL18:50Lambert-St Louis
34h 00m
2 stops
SYD20:50Sydney Kingsford Smith
16 Mar
SYD11:20Sydney Kingsford Smith
28h 38m
1 stop
STL23:58Lambert-St Louis
$1,287
Qantas Airways
23 Mar
STL18:50Lambert-St Louis
34h 00m
2 stops
SYD20:50Sydney Kingsford Smith
30 Mar
SYD18:50Sydney Kingsford Smith
21h 08m
1 stop
STL23:58Lambert-St Louis
$1,298

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 8 February 2026.
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

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/3

18:50-20:50

2 stops34h 00m

Sydney Kingsford Smith

Mon 16/3

11:20-23:58

1 stop28h 38m

$1,287

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 23/3

18:50-20:50

2 stops34h 00m

Sydney Kingsford Smith

Mon 30/3

18:50-23:58

1 stop21h 08m

$1,298

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 31/3

19:29-07:30

1 stop44h 01m

Sydney Kingsford Smith

Mon 13/4

13:15-05:39

2 stops31h 24m

$1,348

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 31/3

19:29-07:30

1 stop44h 01m

Sydney Kingsford Smith

Mon 13/4

13:15-05:39

2 stops31h 24m

$1,354

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/3

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Tue 10/3

10:20-15:29

2 stops45h 09m

$1,633

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:00-07:20

2 stops27h 20m

Sydney Kingsford Smith

Mon 18/5

09:20-20:05

2 stops49h 45m

$1,643

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Sat 11/7

08:50-07:00

2 stops31h 10m

Sydney Kingsford Smith

Fri 14/8

09:30-21:16

2 stops26h 46m

$1,812

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Sat 11/7

10:42-06:55

2 stops29h 13m

Sydney Kingsford Smith

Fri 14/8

10:20-00:14

2 stops28h 54m

$1,886

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Tue 10/3

14:05-07:30

2 stops25h 25m

Sydney Kingsford Smith

Sun 15/3

09:40-17:22

2 stops23h 42m

$1,976

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Wed 5/8

14:00-06:50

2 stops25h 50m

Sydney Kingsford Smith

Wed 26/8

09:15-18:05

2 stops23h 50m

$1,978

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 October is, on average, the cheapest month to fly to Sydney from Illinois, with most prices found around $1,376. If you aren’t able to travel to Sydney during the month of October, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $1,563.

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 $1,802 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 $1,499 on momondo.

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 19% 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 11m

Direct flights

None
The fastest flight from Illinois to Sydney takes 21h 11m
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 $1,216Free cancellationRating
7.5
988 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
Coogee
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.

An easier way to manage your Sydney trip

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