Cheap flights from North Dakota to Illinois from $106

The cheapest month to fly to Illinois from North Dakota is in January. Flight prices, which tend to average around $275, 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 $285.

The cheapest day to depart from North Dakota to Illinois is on a Saturday when prices can be found for as low as $450. Flights from North Dakota to Illinois on a Sunday will generally be more expensive and average around $755. 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 afternoon. Flights from North Dakota to Illinois during this time can be as low as $489. Flights at noon are often more expensive with an average ticket price of $523.

Fly from Fargo Hector Field to Chicago O'Hare Intl for the best North Dakota - Illinois flight prices

You are more likely to see cheaper flights to Illinois from North Dakota when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $344 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from North Dakota for as low as $246 on momondo.

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

Frontier, Delta, and United Airlines are the most popular carriers operating from North Dakota to Illinois

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to Illinois from North Dakota according to our data. American Airlines is the first choice among our users, with 62% 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.

As of August 2026, there are 11 flights per day flying from North Dakota to Illinois. The most common time of day flights depart is 12:00PM, with 69% of flights taking off in the afternoon.

77 flights are operational weekly from North Dakota to Illinois as of August 2026. The most popular departure day for this route is Mon, with 30% of flights per week taking off on this day.