Cheap flights from Boston to Illinois from $115

The cheapest month to fly to Illinois from Boston is in January. Flight prices, which tend to average around $201, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $220.

The cheapest day to depart from Boston to Illinois is on a Friday when prices can be found for as low as $336. Flights from Boston to Illinois on a Sunday will generally be more expensive and average around $429. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Boston to Illinois during this time can be as low as $307. Flights at noon are often more expensive with an average ticket price of $371.

Fly from Boston Logan Intl to Chicago O'Hare Intl for the best Boston Logan Intl - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $278 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Boston for as low as $241 on momondo.

There are 4 cabin classes available to choose from on Boston to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Southwest, Delta, and United Airlines are the most popular carriers operating from Boston Logan Intl to Illinois

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to Illinois from Boston according to our data. American Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

45 flights are operational daily from Boston to Illinois as of November 2026. The most popular departure time for this route is 7:00AM, with 42% of flights per day taking off in the afternoon.

As of November 2026, 317 flights take off from Boston and land in Illinois each week. The most common flight departure day for this route is Sun, with 22% of weekly flights taking off on this day.