Cheap flights from Illinois to Sydney from $539
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 10/31. 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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Fly from
Fly to
Route
Depart
Return
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Fri 3/5
6:29 am-9:50 am
2 stops34h 21m
Sydney Kingsford Smith
Tue 3/16
11:30 am-5:55 pm
1 stop46h 25m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Sun 2/28
5:00 am-9:50 am
2 stops35h 50m
Sydney Kingsford Smith
Thu 3/11
11:30 am-4:55 pm
1 stop46h 25m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Tue 11/3
9:21 am-8:35 am
2 stops30h 14m
Sydney Kingsford Smith
Tue 11/10
9:55 am-8:35 pm
2 stops27h 40m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Sun 2/7
12:45 pm-8:35 am
2 stops26h 50m
Sydney Kingsford Smith
Sun 2/21
11:50 am-6:25 am
2 stops35h 35m
MolineSydney
MLI Moline Quad-City - SYD Sydney Kingsford Smith
MLISYD
Moline Quad-City
Sat 11/7
8:13 am-9:20 am
2 stops32h 07m
Sydney Kingsford Smith
Sat 11/14
11:50 am-5:52 pm
2 stops23h 02m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Tue 3/23
3:40 pm-8:35 am
1 stop24h 55m
Sydney Kingsford Smith
Tue 4/6
9:20 am-2:35 pm
1 stop20h 15m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Tue 2/9
8:58 am-9:35 am
1 stop31h 37m
Sydney Kingsford Smith
Mon 2/15
11:20 am-2:32 pm
1 stop20h 12m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Sun 4/4
5:45 pm-9:25 am
1 stop24h 40m
Sydney Kingsford Smith
Mon 4/12
8:55 pm-8:40 am
1 stop26h 45m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Mon 3/15
5:25 pm-10:30 am
1 stop25h 05m
Sydney Kingsford Smith
Wed 4/14
8:55 pm-8:40 am
1 stop26h 45m
PeoriaSydney
PIA Greater Peoria - SYD Sydney Kingsford Smith
PIASYD
Greater Peoria
Sun 11/29
6:25 am-9:05 am
2 stops33h 40m
Sydney Kingsford Smith
Thu 12/17
11:50 am-9:10 pm
2 stops26h 20m
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?
In general, February is the cheapest month to fly from Illinois to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,230. If you are unable to visit Sydney during the month of February, then departing from Illinois during the month June is also very affordable. Most momondo users find prices during this month for around $1,278.
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 $1,422 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Illinois for as low as $1,055 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
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 are updated daily.
How many operators does momondo search for flights from Illinois to Sydney Kingsford Smith Airport?
There are 8 operators available for flights from Illinois to Sydney Kingsford Smith Airport as of October 2026.
How old do you have to be to fly from Illinois to Sydney Kingsford Smith Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. 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 license 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 | ||
|---|---|---|---|---|---|
| PriceFrom $237 | Free Cancellation | Rating 7.8 8,652 reviews | |||
| PriceFrom $716 | Free Cancellation | Rating 8.0 259 reviews | |||
| PriceFrom $837 | Free Cancellation | Rating 7.5 1,106 reviews | |||
| PriceFrom $837 | Free Cancellation | Rating 7.0 12,149 reviews | |||
| PriceFrom $870 | Free Cancellation | Rating 7.4 10,330 reviews | |||
| PriceFrom $1,120 | Free Cancellation | Rating 7.1 11,748 reviews | |||
| PriceFrom $1,193 | Free Cancellation | Rating 8.3 1,321 reviews | |||
| PriceFrom $1,294 | Free Cancellation | Rating 8.0 671 reviews |
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Why should I use momondo to find a flight deal from Illinois to Sydney?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to Sydney for you.
Can I find flights from Illinois to Sydney with flexible booking policies on momondo?
All flight searches from Illinois to Sydney on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from Illinois to Sydney?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Illinois to Sydney.
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.