$1,273 Cheap flights to Illinois

For prices as low as $110/pp, you can find flights to Illinois depending on where you are departing from. On average, flights to Illinois cost $888/pp.

Chicago is about 99% more popular to visit than any other city in Illinois, according to momondo users. When visiting Chicago, it is recommended to fly into Chicago O'Hare Intl Airport, where you can typically get the cheapest prices and the most convenient travel options into the city.

The closest airport to River North is Chicago O'Hare Intl Airport, and would make for the quickest drive. For those interested in a secondary airport to fly into, consider looking at flights heading to Chicago Midway Airport.

When visiting Illinois, the majority of people tend to find River North, Chicago Riverwalk and Millennium Park to be the most notable landmarks in the area.

The temperatures in Illinois range from -5 °C to 23 °C depending on the time of year. The warmest month in Illinois is July, and the coldest month in Illinois is January. Those looking for a drier month during their visit should travel during the months of January, February, or December, when rain is least likely compared to the rest of the year.

There are 10 airlines that fly to Illinois on a routine basis, but Qantas Airways, United Airlines and Air Canada happen to be the most popular among our users. In the past year, 58% of those who searched for flights to Illinois looked to travel with Qantas Airways, making this airline the top choice among momondo travellers.

The best day of the week to fly to Illinois is Tuesday due to prices being at their lowest. Flying out on a Monday should be a backup plan since this day tends to be less expensive as well. Saturday, on the other hand, is the most expensive day to fly to Illinois.

Prices for flights to Illinois refresh daily.

The number of operators available for flights to Illinois is 11 as of December 2025.

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 to Illinois.

The travel and health documents required for your trip to Illinois 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 licence, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.