Cheap flights from Chicago O'Hare Intl Airport to Sydney from $454
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 O'Hare Intl Airport to Sydney departing on 8/26. 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 O'Hare Intl Airport 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, March is the cheapest month to fly from Chicago O'Hare Intl Airport to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $857. If you are unable to visit Sydney during the month of March, then departing from Chicago O'Hare Intl Airport during the month May is also very affordable. Most momondo users find prices during this month for around $871.
What is the cheapest day to depart on your flight to Sydney?
The cheapest day to depart from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport 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 O'Hare Intl Airport when booking 25 weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,112 when searching 25 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Chicago O'Hare Intl Airport for as low as $865 on momondo.
Can stopping save me money on Chicago O'Hare Intl Airport to Sydney flights?
You could potentially save up to 33% on your flight if you consider stops on a Chicago O'Hare Intl Airport to Sydney flight.
How have Chicago O'Hare Intl Airport to Sydney flight prices changed over time?
As of June 2025, prices for Chicago O'Hare Intl Airport to Sydney flights are approximately 53% cheaper when compared to flights at the same time last year.
What is the cheapest airline that flies from Chicago O'Hare Intl to Sydney Kingsford Smith?
Fiji Airways, Alaska Airlines, and Qantas Airways are the most popular carriers operating from Chicago O'Hare Intl 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 O'Hare Intl Airport 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 O'Hare Intl Airport to Sydney
Cheap Chicago O'Hare Intl Airport to Sydney (ORD to SYD) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Sydney
How far is Chicago O'Hare Intl to Sydney Kingsford Smith by plane?
Sydney Kingsford Smith is 9224.8 mi away from Chicago O'Hare Intl. 21h 18m is a normal flight duration for this route.
When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport?
Prices for flights from Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport?
The number of operators available for flights from Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport is 8 as of June 2025.
How old do you have to be to fly from Chicago O'Hare Intl Airport 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 Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport.
What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?
The travel and health documents required for your trip to Sydney Kingsford Smith Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sydney Kingsford Smith Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Chicago O'Hare Intl Airport to Sydney?
Based on momondo bookings for flights between Chicago O'Hare Intl Airport and Sydney, the leading airline is American Airlines, making up 47% of the total bookings. Other popular airlines include Qantas Airways with 28%, United Airlines with 9%, and Air Canada with 9%.
Best airlines flying from Chicago O'Hare Intl Airport to Sydney
Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to Sydney with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $679 | Free Cancellation | Rating 8.3 882 reviews | |||
| PriceFrom $813 | Free Cancellation | Rating 7.5 854 reviews | |||
| PriceFrom $825 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $852 | Free Cancellation | Rating 8.0 7,950 reviews | |||
| PriceFrom $970 | Free Cancellation | Rating 8.1 194 reviews | |||
| PriceFrom $972 | Free Cancellation | Rating 7.1 9,531 reviews | |||
| PriceFrom $1,203 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $1,275 | Free Cancellation | Rating 8.0 483 reviews |
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Why should I use momondo to find a flight deal from Chicago to Sydney?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Chicago to Sydney. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Chicago to Sydney with flexible booking policies on momondo?
All flight searches from Chicago to Sydney on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from Chicago to Sydney?
Once all potential Chicago to Sydney flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
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.