Question : How long do most people visit Sioux Falls?
Answer : Of course you're not most people, but if you were, you'd stay roughly five days.
Question : What is the cheapest day to fly in the next four weeks?
Answer : Jun 29th has seen bookings (as of Jun 26th) as cheap as $541. That comes in 11% below the average price for this route. Saving on flight costs means you'll have more money in your hand for the trip.
Question : Do prices fluctuate more for this route than others?
Answer : Prices for this trip tend to change more than other flights in the United States. They can range from $420 to $841. However, the sooner you book, the more you'll be able to save.
Question : Over the coming months, which airline is getting their passengers to Sioux Falls Regional Airport (Joe Foss Field) (FSD) round-trip the cheapest?
Answer : United Airlines is your best bet for finding that coveted low fare. They're offering fares as low as $420, while prices for other flights are as high as $841.