Cheap flights from Illinois to Sydney from $775
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 31/10. 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 5/3
06:29-09:50
2 stops34h 21m
Sydney Kingsford Smith
Tue 16/3
11:30-17:55
1 stop46h 25m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Sun 28/2
05:00-09:50
2 stops35h 50m
Sydney Kingsford Smith
Thu 11/3
11:30-16:55
1 stop46h 25m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Fri 5/3
06:29-09:50
2 stops34h 21m
Sydney Kingsford Smith
Tue 16/3
11:30-17:55
1 stop46h 25m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Tue 3/11
09:21-08:35
2 stops30h 14m
Sydney Kingsford Smith
Tue 10/11
09:55-20:35
2 stops27h 40m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Sun 7/2
12:45-08:35
2 stops26h 50m
Sydney Kingsford Smith
Sun 21/2
11:50-06:25
2 stops35h 35m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Sun 24/1
13:55-08:35
2 stops25h 40m
Sydney Kingsford Smith
Sun 7/2
11:50-18:25
2 stops23h 35m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Fri 5/3
22:45-09:50
1 stop42h 05m
Sydney Kingsford Smith
Mon 15/3
11:30-05:02
2 stops33h 32m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Fri 5/3
06:29-09:50
2 stops34h 21m
Sydney Kingsford Smith
Tue 16/3
11:30-05:02
2 stops33h 32m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Mon 19/10
10:30-07:30
1 stop29h 00m
Sydney Kingsford Smith
Wed 4/11
14:05-20:00
1 stop22h 55m
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Tue 29/12
21:18-09:00
1 stop42h 42m
Sydney Kingsford Smith
Tue 2/2
11:20-18:28
1 stop24h 08m
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 February is, on average, the cheapest month to fly to Sydney from Illinois, with most prices found around $1,768. If you aren’t able to travel to Sydney during the month of February, then flying in June is also cheap. Prices for this month can be found on momondo for an average of $1,837.
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 $2,044 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 $1,517 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 refresh daily.
How many operators does momondo search for flights from Illinois to Sydney Kingsford Smith Airport?
The number of operators available for flights from Illinois to Sydney Kingsford Smith Airport is 1 as of October 2026.
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 | ||
|---|---|---|---|---|---|
| PriceFrom $2,275 | Free cancellation | Rating 7.5 1,104 reviews |
Travelling to a place near Sydney?
Book flights to Sydney if you plan to visit one of these locationsWhy 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.