$473 Find Cheap Flights from Australia to Illinois

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KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results for flights to Illinois
These are the airlines KAYAK users have selected most often from within our search results for flights to Illinois
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KAYAK's insights & trends for flights to Illinois

Get data-powered insights and trends for flights to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Australia to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Australia to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Australia to Illinois is February, when tickets cost $979 (return) on average. On the other hand, the most expensive months are December and September, when the average cost of round-trip tickets is $1,822 and $1,358 respectively.

How far in advance should I book a flight from Australia to Illinois?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Australia to Illinois, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 20 weeks before departure.


Good to know

Low seasonMarch
High seasonJuly
Cheapest flight$473
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly with an average 3% increase in price.
Flight from Sydney to Chicago O'Hare Airport

FAQs for booking flights from Australia to Illinois

  • How does KAYAK find such low prices on flights from Australia to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Australia to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Australia to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Australia to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Australia to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Australia to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Australia to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Australia to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest day to fly to Illinois?

    Based on KAYAK data, the cheapest day to fly to Illinois is Monday where round-trip tickets can be as cheap as $1,071. On the other hand, the most expensive day to fly is Friday, where round-trip prices are $1,613 on average.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally at night, when round-trip flights cost $1,141 on average. Morning departures are around 1% more expensive than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $1,365.

Top 5 airlines serving from Australia to Illinois

 
See real verified KAYAK customer reviews for airlines flying to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Australia to Illinois. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Australia to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.6
FinnairOverall score based on 1282 reviews
6.7Food
7.6Boarding
6.9Entertainment
7.4Comfort
8.1Crew
Airline reviews

The staff were all particularly great. The plane was clean and fresh. The bassinet worked great. It was all very nice.

10.0 ExcellentDaniel, May 2025DFW - HEL
Read more Finnair reviews

The staff were all particularly great. The plane was clean and fresh. The bassinet worked great. It was all very nice.

Boarding uncomfortable. Stewardess said I would have to check my carry on as there was no room in the overhead bins. Another passenger helped me find a spot.

Any flight that lands safely is a good flight. However our leg from Helsinki was delayed 1 hour with no explanation. The delay would not allow us to make our connection to Cincinnati. I was informed by American Airlines that our Cincinnati flight was rescheduled for the following day. I immediately made a non refundable hotel reservation in Dallas. Upon exiting the plane at Dallas I was given a hotel voucher. Nice, but I can't get a refund on the hotel I booked. A little communication would have been helpful. Food on Finnair is below quality of Korean Air.

The cabin crew really looked like they wanted to be somewhere else. They weren't really interested in providing an attentive service to full fare paying passengers at all. However the Captiain's in flight announcements were relaxed and very entertaining.

Crew were professional and responsive. Food was mediocre and breakfast could do with revampinmg

Food was very ordinary for premium economy, very small portions.

i dont know WHY they call it business class. the seats are NOT significantly wider than economy seats, they just do not let the middle seats be beepked to give the illusion of more space between passengers. the seats do NOT recline any more than economy seats either. the only real difference is the full meal served to business (vs none for economy). I would rather have a wider, lie flat ACTUAL business class seat with no food for a 3 hr flight. this was pretty disappointing to say the least.

There wore nice leather like sits, in my opinion seats lay out bit tight . Crew was great they did averything possible to make averywone comfortable as possible, food was, think worst I ever head on flight, head chicken and yellow rice. Ice cream was a nic treat.

Our previous flight was delayed but they waited for us to board.

Flight was delayed, short time connection to next flight but we make it, service was good, worth to fly just to try thair on board blueberry juce. Eccelent communication with airline.

Delayed QF59 flight once again, Qantas doesn't fail in maintaining there delayed departures and arrivals. USB points do not work nor do the power point sockets on the plane, Qantas staff admitted that on the flight. Don't expect to your charge devices. Saving grace, was the ice cream. Bottom line, if you expect to fly to HND and make it on time avoid Qantas and if you're interested in ice cream - visit 7/11.

Pretty excellent. I don’t know what the pilot could have done better with the bumping ( there was a storm) nor what happened to my ears coming down into bendigo. It doesn’t happen coming down into Sydney just the return flight. I wonder why?

Touch screens were very difficult to use, generally being laggy and unresponsive- it was quite an art to get it to play the thing you wanted rather than some thing at random. Selection of films and Tv was good when touchscreen decided to finally respond.

Their aircraft are old and amenities lack way behind other international carriers leaving from BNE. Even in economy

Airport and crew experience was excellent. We had to queue for the runway - no one’s fault, but it did mean we were 30 minutes late leaving

Overall good experience with flight and airport wheelchair staff. Also got Indian food in the flights

Friendly staff, surprisingly good premium economy seats allowing good sleep/ snooze opportunity and very good menu.

Very good as always, stand out airline. The passengers whom choose to stuff baggage that otherwise should be checked-in is a real bother but that's not the airlines doing. A real frustration that passengers just don't want to check-in luggage. This is a pet hate unfortunately.

It’s a two prop flight so I had problems with my ears on re- entering ! But otherwise fine

I love flying with Qantas. There was no onscreen entertaining on this flight, and only a snack provided (not a meal) but still better than Jetstar or Virgin (in my opinion) so still happy.

The schedule to Moline changed 5 times. The gate changed 6 times. That is a pathetic way to run an airline. No wonder that no one in our company flies on United Express to or from Moline. Changes happen most of the time. I learned my lesson on this trip…never again!

All flight attendants could benefit by taking an international flight on Qantas Airline. Qantas attendants are much more hospitable in every way. Much superior than and attendants on any US airline.

While the staff was pleasant and helpful, the following observations are for your awareness. There was some delay on the tarmac on take off and landing. The paid lunch/food offerings were limited. Entertainment was only available on WiFi at a cost.

The first flight was better in terms of the aircraft.

So far so good but food and entertainment are not available for this flight

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

Overall poor for me I paid extra for seats with leg room and my regional flights exit row seats have less leg room then the others that's money that could have been saved and on my final flight home the flights air was not operating it was unbearably hot in the cabin I will be contacting United and filing a DOT complaint

It was my first time with United Airlines and I would say it was very good experience and best of all the flights were on time. Will definitely fly with United Airlines next time.

Very modern plane. Good seat spacing. Meals were good. Screens had tons of movies and worked

There's just no way to sit fully upright and comfortably in these seats. There needs to be 2 more inches of room, and that's not something that only one person on the flight needs - the whole flight needs 2 more inches of room. If that means you sell 6 less seats, so be it. It's too close for anyone. Forcing people to pay for "premium" economy just to get "barely enough space to breathe" isn't really an answer to that.

To start, I’d like to say that every American Airline personnel I interacted with on the ground, especially flight crew, was very friendly and did their best to help me out. Despite this, however, my experience with the airline was an entire mess. The 7:19 PM flight was heavily delayed due to weather, and pushed to 10:30 AM the next morning. Because of this, I had to spend the night inside of the airport. At some point later in the night, I got an email saying that the flight had been canceled. I called the support number, and the representative on the other line told me that the flight was still on and that I didn’t need to rebook. The next morning, no one came to the gate to open the door for the crew until almost 11 AM. By this time the flight crew had been waiting for over an hour, and they had called management to get someone to open the door for them multiple times. Around 11:30, the gate screen had changed to a different flight. I ended up buying a last minute ticket with Southwest airline just to get to Chicago, because the next flight with American wasn’t until 7:19 pm that day. Now, earlier that morning my suitcase had been sent ahead of me to ORD. I went to baggage claim to ask them if I could have my suitcase forwarded to where I was staying. The representative at SDF baggage claim said they could and put the claim in for me. As I was going back through TSA, I got an email that the airline had found my suitcase, but the next step was to send it BACK to SDF. I called the airline support number again, and I made it clear that my suitcase needed to stay in Chicago and to not come back to SDF. The representative told me that they would hold my suitcase at ORD and that it wasn’t going to be forwarded anywhere. Once I got there, I found that they had loaded my suitcase onto a plane to send it back to SDF. Thankfully, I had gotten to the baggage claim counter in time for them to put in a request to bring my suitcase back up. My refund with the airline is processing already, but because of this entire experience and miscommunication at every turn of the way, I will not book with American Airlines in the future.

The plane was late and then sat on the runway for almost 45 minutes before taking off.

Crew professional. Easy bag drop off. On time. Good entertainment.

Everything was great. Boarding, early departure, early arrival, and deplaning were smooth. Smooth flight.

Per usual, flight status, staff courtesy and professionalism were excellent

Everything was on time, we arrived early, everything worked well.

The only thing is if Wi-Fi is available after you land and taxi to the gate. It takes forever to get to the gate, and having the Wi-Fi continue would be great to bide the time at least 5 minutes before you arrive at the entrance. That is my only comment; otherwise, everything was good.

Had to wait on pilot and crew to depart and had to wait to arrive at the gate because they only had 2 crews working. Delays, delays....Planes just keep getting smaller and tighter and they nickle and dime for everything. When will an airline actually wake up and make flying more enjoyable?

Seating was horrible. Small seats. Access to flight information and extras very iser unfriendly. Kept losing internet after paying for it. Staff in madison was as unprofessional and unhelpful.

Delayed due to no crew. On a major holiday travel day.

flight landed late almost 1.00hr and we 4 passengers missed our connected flight to indianapolis, we need to get the hotel and taxi for the next day flight to home in indianapolis, cost us $ 300 more

Or the greatest and it ended up picking us up from Chicago to Toronto not sure who was tesponsible for the 4 hr delay. United should have been properly prepared for a scheduled flight from Austin to Chicago and they were not.

Good, only discomfort was consistent turbulence through the 3 hour flight. Not sure if in companies control though.

From the kind young lady (w/Vancouver air security) who expedited our check-in to U.S. Customs to the Air Canada gate crew who gave us pre-boarding, the flight attendants who actually offered a strong hand to help me board once I had surrendered my rolling walker at the door, they are all reflections of the thoughtful, genuinely helpful Canadians we have grown to appreciate. Water and other beverages were offered throughout the flight to make sure we weren't dehydrated and the cookie was great. (Husband bought the fruit & crackers snack,) I was delighted to see three movies that I would not have otherwise seen and appreciate that AC left the last film viewable until its conclusion although the flight had actually landed. Last, mahalo to the kind strong gentleman who not offered his hand to help me debark the plane, but gave me an AC pin that I'll truly treasure.

The ground staff was so rude in Toronto airport ...very rude and did not answer simple questions, and made me look like a fool. Very rude ground staff.

My flight got delayed 5 times and then got cancelled eventually, I had to get a hotel and uber and pay for food for an extra night without any plans. It was a horrible experience, instead of Air Canada, I was flying with United .

I had a nice flight with free wifi. So I was able to message family members and stream music during my flight, which made the trip go by fast. I also enjoyed flying on there Airbus A220. The plane looked very new and it also got up to speed fast down the runway and didn't need much runway to get airborne.

Short flight so no food or entertainment. Good landing at SFO and on time. We were told no carryon luggage yet lots of people were puting bags in overhead compartments. The rules need to be made more clear. I was on the first leg of an international flight and this is the first time I could not have carryon luggage.

My flight was overbooked and they would not let me board. I had to book another flight and pay the full amount of that flight. I did not get any help at all from Air Canada or United Airlines.

Comfortable seats and movies entertainment available. Better experience than the flight from Toronto to Denver.

Book cheap flights from Australia to Illinois

Recent round-trip flight deals

 
These are the cheapest round-trip flights to Illinois found on KAYAK in the last 72 hours.
6/16Mon
1 stopQantas Airways
23h 07mSYD-ORD
6/29Sun
1 stopQantas Airways
24h 53mORD-SYD
$820
8/18Mon
2 stops
49h 40mSYD-STL
11/8Sat
2 stops
24h 05mSTL-SYD
$863
6/23Mon
1 stopUnited Airlines
33h 08mMEL-STL
7/4Fri
2 stopsUnited Airlines
27h 55mSTL-MEL
$890
8/13Wed
1 stopAir Canada
20h 29mSYD-ORD
8/25Mon
2 stopsAir Canada
23h 59mORD-SYD
$892
8/13Wed
2 stopsAir Canada
24h 04mSYD-ORD
8/25Mon
2 stopsAir Canada
24h 59mORD-SYD
$898
8/18Mon
1 stopUnited Airlines
21h 25mSYD-STL
11/8Sat
2 stopsUnited Airlines
28h 55mSTL-SYD
$901
6/24Tue
1 stopAmerican Airlines
37h 26mSYD-ORD
7/29Tue
1 stopAmerican Airlines
21h 20mORD-SYD
$934
8/28Thu
1 stopAmerican Airlines
35h 20mMEL-ORD
9/28Sun
2 stopsAmerican Airlines
24h 02mORD-MEL
$944
6/23Mon
2 stopsVirgin Australia
29h 11mOOL-ORD
6/30Mon
2 stopsVirgin Australia
27h 00mORD-OOL
$1,682
6/23Mon
2 stopsVirgin Australia
37h 09mBNE-ORD
7/10Thu
1 stopVirgin Australia
41h 50mORD-BNE
$1,769

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Recent one-way flight deals

 
Only flying one-way? Below are some of the best deals for one-way flights to Illinois found on KAYAK in the last 72 hours.
9/23Tue
2 stops
25h 16mSYD-ORD
$473
7/18Fri
2 stops
31h 10mSYD-ORD
$475
7/22Tue
1 stopQantas Airways
35h 57mBNE-ORD
$491
7/18Fri
1 stopQantas Airways
37h 11mSYD-ORD
$503
7/16Wed
1 stopQantas Airways
22h 52mSYD-ORD
$506
11/17Mon
1 stopUnited Airlines
21h 03mMEL-STL
$537
7/9Wed
1 stopUnited Airlines
33h 34mSYD-STL
$538
11/17Mon
3 stopsAir Canada
48h 26mMEL-STL
$540
11/17Mon
3 stopsAir Canada
48h 41mMEL-STL
$558
6/1Sun
1 stopAmerican Airlines
25h 28mSYD-ORD
$688

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Last minute flights to Illinois

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights to Illinois that are departing in the next 10 days.
5/25Sun
multi-stopAmerican Airlines
24h 53mMEL-ORD
6/4Wed
multi-stopAmerican Airlines
25h 51mORD-MEL
$1,095
5/25Sun
multi-stopAmerican Airlines
21h 10mMEL-ORD
6/4Wed
multi-stopAmerican Airlines
23h 13mORD-MEL
$1,099
5/23Fri
multi-stopCathay Pacific
43h 15mSYD-ORD
5/26Mon
multi-stopCathay Pacific
27h 50mORD-SYD
$1,426
5/23Fri
multi-stopAir Canada
39h 11mSYD-ORD
5/26Mon
multi-stopAir Canada
27h 18mORD-SYD
$1,428
5/23Fri
multi-stopCathay Pacific
46h 55mADL-ORD
5/25Sun
multi-stopCathay Pacific
35h 00mORD-ADL
$1,491
5/23Fri
multi-stopAir Canada
37h 39mSYD-ORD
5/26Mon
multi-stopAir Canada
29h 40mORD-SYD
$1,562
5/23Fri
multi-stop
27h 53mADL-ORD
5/25Sun
multi-stop
26h 10mORD-ADL
$2,093
5/23Fri
multi-stop
35h 27mSYD-ORD
5/26Mon
multi-stop
33h 55mORD-SYD
$2,121
5/23Fri
multi-stopQatar Airways
31h 55mADL-ORD
5/25Sun
multi-stopQatar Airways
43h 05mORD-ADL
$2,172
5/23Fri
multi-stopQatar Airways
31h 55mADL-ORD
5/25Sun
multi-stopQatar Airways
30h 00mORD-ADL
$2,190

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Everything you need to know for your flight to Illinois

Cabin class types available on flights to Illinois

Cabin classes available on flights to Illinois. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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