Cheap flights from Chicago to Sydney from $432
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 9/16. 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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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?
In general, August is the cheapest month to fly from Chicago to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $863. If you are unable to visit Sydney during the month of August, then departing from Chicago during the month April is also very affordable. Most momondo users find prices during this month for around $867.
What is the cheapest day to depart on your flight to Sydney?
The cheapest day to depart from Chicago to Sydney is on a Saturday when prices can be found for as low as $1,166. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,391.
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 morning. momondo users have found flights departing from Chicago to Sydney in the morning for as low as $1,224. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly in the evening, with an average ticket price of $1,412. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.
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 $1,110 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Chicago for as low as $931 on momondo.
Can stopping save me money on Chicago to Sydney flights?
You could potentially save up to 2% 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 July 2025, prices for Chicago to Sydney flights are approximately 56% cheaper when compared to flights at the same time last year.
What is the cheapest airline that flies from Chicago to Sydney Kingsford Smith?
Alaska Airlines, ANA, and Qantas Airways are the most popular carriers operating from Chicago to Sydney Kingsford Smith
What airlines fly to Sydney?
American Airlines, Qantas Airways and United Airlines are the top three most popular airlines that fly to Sydney from Chicago according to our data. American Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 8 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.
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?
There are 9237.5 mi between Chicago and Sydney Kingsford Smith. By plane, this route typically takes 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 July 2025, there are 8 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 a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Chicago 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.
What is the most popular airline from Chicago to Sydney?
Based on momondo bookings for flights between Chicago and Sydney, the leading airline is American Airlines, making up 46% of the total bookings. Other popular airlines include Qantas Airways with 29%, United Airlines with 10%, and Air Canada with 7%.
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 $679 | Free Cancellation | Rating 8.4 892 reviews | |||
| PriceFrom $813 | Free Cancellation | Rating 7.5 870 reviews | |||
| PriceFrom $825 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $849 | Free Cancellation | Rating 8.0 202 reviews | |||
| PriceFrom $852 | Free Cancellation | Rating 8.0 7,983 reviews | |||
| PriceFrom $970 | Free Cancellation | Rating 7.1 9,669 reviews | |||
| PriceFrom $1,203 | Free Cancellation | Rating 7.4 8,861 reviews | |||
| PriceFrom $1,330 | Free Cancellation | Rating 8.0 486 reviews |
Traveling 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?
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 Chicago to Sydney for 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 for Chicago to Sydney flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from Chicago to Sydney right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Chicago to Sydney flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.