1,243 - 2,271 AUD
In general when looking for the cheapest flight to Illinois, try to book your flight during the month of May for the best deal.
In general, most flyers find the cheapest time to book a flight to Illinois is about 59 days prior.
On average, the cheapest flights to Illinois are found when departing on a Friday. Try to avoid departing on a Sunday, as this is usually the most expensive day.
In general, when looking for the cheapest flight to Illinois, our data indicates that morning flights are the most cost-effective. evening flights tend to be the most expensive.