Cheap flights from Chicago to Sydney from $691
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to Sydney departing on 15/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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.Find the cheapest flights from Chicago to Sydney
Cheap return flights
Cheap one-way flights
Cheap last-minute flights
Delta flights from Chicago to Sydney
Our best Delta deals on Chicago to Sydney flight tickets
Korean Air flights from Chicago to Sydney
Our best Korean Air deals on Chicago to Sydney flight tickets
See travel insights to Sydney from
How to get the cheapest flight ticket from Chicago 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 typical price of a round-trip flight between Chicago and Sydney?
What is the cheapest month to fly to Sydney?
The month of August is, on average, the cheapest month to fly to Sydney from Chicago, with most prices found around $1,315. If you aren’t able to travel to Sydney during the month of August, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $1,326.
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 $1,805. The most expensive day to fly to Sydney is Tuesday, with ticket prices averaging around $2,479.
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 Chicago to Sydney in the afternoon for as low as $2,112. 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 $3,228 on average. Flights to Sydney from Chicago 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 Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,700 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 Chicago for as low as $1,424 on momondo.
Can stopping save me money on Chicago to Sydney flights?
You could potentially save up to 6% on your flight if you consider stops on a Chicago to Sydney flight.
How have Chicago to Sydney flight prices changed over time?
As of June 2025, prices for Chicago to Sydney flights are approximately 55% cheaper when compared to flights at the same time last year.
When to book flights from Chicago to Sydney
Cheap Chicago to Sydney (CHI to SYD) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Chicago to Sydney
How far is Chicago to Sydney Kingsford Smith by plane?
Chicago and Sydney Kingsford Smith are 14866.2 km apart from one another. A reasonable flight in good conditions will take 21h 53m.
When did momondo last update prices for flights from Chicago to Sydney Kingsford Smith Airport?
Prices for flights from Chicago to Sydney Kingsford Smith Airport were last updated today.
How many operators does momondo search for flights from Chicago to Sydney Kingsford Smith Airport?
As of June 2025, there are 2 operators available to choose from for flights from Chicago to Sydney Kingsford Smith Airport.
How old do you have to be to fly from Chicago to Sydney Kingsford Smith Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Chicago to Sydney Kingsford Smith Airport.
What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?
The necessary travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Chicago to Sydney?
momondo data reveals that the most frequently booked airline on the route from Chicago to Sydney is Qantas Airways, representing 84% of all bookings. The subsequent popular airline is United Airlines at 16%.
Best airlines flying from Chicago to Sydney
Compare and see reviews for airlines that fly from Chicago to Sydney with momondo
| Airline | Rating | Free cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $1,305 | Free cancellation | Rating 7.5 866 reviews | |||
| PriceFrom $1,670 | Free cancellation | Rating 7.1 9,646 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 Chicago to Sydney?
It is quick and easy to find Chicago to Sydney flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Sydney that suits you.
Can I find flights from Chicago to Sydney with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to Sydney from Chicago with this policy.
How can momondo help me find flights from Chicago to Sydney?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Sydney from Chicago.
I’m not ready to book a flight from Chicago 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 Chicago and alert you when they change.