Cheap flights from Illinois to South Dakota from $145

The month of May is, on average, the cheapest month to fly to South Dakota from Illinois, with most prices found around $168. If you aren’t able to travel to South Dakota during the month of May, then flying in December is also cheap. Prices for this month can be found on momondo for an average of $189.

The cheapest day to depart from Illinois to South Dakota is on a Wednesday. Travelers who choose to depart for South Dakota on a Wednesday will often find tickets for as low as $249. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $536. These prices are subject to change though, so be sure to set up a Price Alert for flights to South Dakota.

The cheapest time of day to fly to South Dakota is in the evening when flights can be purchased for as low as $299. At noon is when there is more demand to fly to South Dakota, so prices are often more expensive at around $374 per ticket.

Fly from Chicago O'Hare Intl to Rapid City for the best Illinois - South Dakota flight prices

There are 4 cabin classes available to choose from on Illinois to South Dakota 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 13% on your flight if you consider stops on a Illinois to South Dakota flight.

As of June 2026, 17 flights take off from Illinois and land in South Dakota each day. The most common flight departure time for this route is 8:00AM, with 38% of daily flights taking off at noon.

As of June 2026, 124 flights take off from Illinois and land in South Dakota each week. The most common flight departure day for this route is Tue, with 19% of weekly flights taking off on this day.