Cheap flights from South Dakota to Illinois from $100
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from South Dakota to Illinois departing on 6/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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How to get the cheapest flight ticket from South Dakota to Illinois
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Illinois?
The cheapest month to fly to Illinois from South Dakota is in January. Flight prices, which tend to average around $193, 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 September is also cheap. Prices for this month can be found on momondo for an average of $250.
What is the cheapest day to depart on your flight to Illinois?
The cheapest day to depart from South Dakota to Illinois is on a Friday when prices can be found for as low as $439. Flights from South Dakota to Illinois on a Sunday will generally be more expensive and average around $622. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Illinois?
Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from South Dakota to Illinois during this time can be as low as $244. Flights in the afternoon are often more expensive with an average ticket price of $524.
What is the cheapest South Dakota to Illinois flight route?
Fly from Watertown to Chicago O'Hare Intl for the best South Dakota - Illinois flight prices
How far in advance should I book a flight to Illinois?
You are more likely to see cheaper flights to Illinois from South Dakota when booking 21 weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $279 when searching 21 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from South Dakota for as low as $235 on momondo.
What cabin class options are available on South Dakota to Illinois flights?
There are 4 cabin classes available to choose from on South Dakota to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from South Dakota to Illinois?
Frontier, American Airlines, and Delta are the most popular carriers operating from South Dakota to Illinois
What airlines fly to Illinois?
United Airlines, American Airlines and Denver Air Connection are the top three most popular airlines that fly to Illinois from South Dakota according to our data. United Airlines is the first choice among our users, with 57% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 4 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.
How many flights depart from South Dakota to Illinois on average per day?
As of June 2025, there are 26 flights per day flying from South Dakota to Illinois. The most common time of day flights depart is 12:00PM, with 48% of flights taking off in the afternoon.
How many flights depart from South Dakota to Illinois on average per week?
The number of flights available between South Dakota and Illinois is 186 per week as of June 2025. The most frequent departure day is Fri, with 16% of weekly flights leaving on this day.
Cheap South Dakota to Illinois flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from South Dakota to Illinois
Best Price Found | $100 |
|---|---|
Fastest flight time | 1h 42m |
Direct flights | Mon, Tue, Thu, Fri, Sat and Sun |
Airports in Illinois | 3 airports |
When did momondo last update prices for flights from South Dakota to Illinois?
Prices for flights from South Dakota to Illinois are updated daily.
How many operators does momondo search for flights from South Dakota to Illinois?
The number of operators available for flights from South Dakota to Illinois is 3 as of June 2025.
How old do you have to be to fly from South Dakota to Illinois?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from South Dakota to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from South Dakota to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from South Dakota to Illinois is Canadair (Bombardier) Regional Jet CRJ-550 (18.73% of total bookings). The next most popular plane models are Canadair (Bombardier) Regional Jet 700 (14.20%), Embraer 170 (11.75%), and Boeing 737-700 (11.75%).
Best airlines flying from South Dakota to Illinois
Compare and see reviews for airlines that fly from South Dakota to Illinois with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $160 | Free Cancellation | Rating 8.7 8 reviews | |||
| PriceFrom $179 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $194 | Free Cancellation | Rating 7.4 8,801 reviews | |||
| PriceFrom $208 | Free Cancellation | Rating 8.0 7,963 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from South Dakota to Illinois?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from South Dakota to Illinois for you.
Can I find flights from South Dakota to Illinois with flexible booking policies on momondo?
momondo does allow users to show only those flights to Illinois from South Dakota which offer a flexible booking policy as well as other useful filters and features.
How can momondo help me find flights from South Dakota to Illinois?
Once all potential South Dakota to Illinois flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from South Dakota to Illinois right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to Illinois from South Dakota. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.