Cheap flights from Billings to Illinois from $169

The cheapest month to fly to Illinois from Billings is in February. Flight prices, which tend to average around $279, 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 February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $290.

The cheapest day to depart from Billings to Illinois is on a Saturday when prices can be found for as low as $407. Flights from Billings to Illinois on a Monday will generally be more expensive and average around $724. 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 at noon. Flights from Billings to Illinois during this time can be as low as $505. Flights in the morning are often more expensive with an average ticket price of $583.

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

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

You could potentially save up to 36% on your flight if you consider stops on a Billings to Illinois flight.

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

United Airlines, Delta and American Airlines are the top three most popular airlines that fly to Illinois from Billings according to our data. United 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 3 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

The number of flights available between Billings and Illinois is 2 per day as of August 2026. The most frequent departure time is 12:00PM, with 93% of daily flights leaving in the afternoon.

As of August 2026, 15 flights take off from Billings and land in Illinois each week. The most common flight departure day for this route is Sat, with 20% of weekly flights taking off on this day.