€341 Cheap flights to Illinois

The majority of momondo users who fly to Illinois tend to spend time in Chicago, which is visited 100% more often than other cities. When flying to Chicago, the most popular airport to fly into is Chicago O'Hare Intl Airport.

For the quickest drive from an arrival airport to Grant Park, fly into Chicago O'Hare Intl Airport or Chicago Midway Airport, which are closest to the area.

The most often visited landmarks in Illinois are Grant Park, Donald E. Stephens Convention Center, and Magnificent Mile, among many others that can be found in the area.

Temperatures in Illinois can vary between -5 °C and 23 °C based on the time of year. Typically, the coldest month in Illinois will be January, and the warmest month will be July. It is also worth noting that those looking to avoid rain and/or snow should consider travelling to Illinois in January, February, and December, as that is when precipitation is least likely.

Of the 5 airlines that fly to Illinois, Aer Lingus, United Airlines and British Airways happen to be the most favoured based on our user data. Aer Lingus is the most popular among the three airlines, with 64% of users choosing them for their travels to Illinois.

You can expect to spend an average of €827 for a flight to Illinois. However, our users found flights to Illinois for €391, which is the cheapest price we’ve seen in the past week. €2,541 per ticket tends to be the most expensive a flight to Illinois will get, whereas anything for €634 or less is considered a good deal.

If your travel plans are flexible and you’re looking to save money on flights to Illinois, then be sure to book your departure on a Wednesday. Flying out on a Wednesday, as well as a Thursday, is your best option. Departing on a Tuesday tends to be the most expensive day of the week to fly to Illinois.

Prices for flights to Illinois are refreshed on a daily basis.

There are 5 operators available for flights to Illinois as of January 2026.

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify 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.