Question : How many days should you spend in Sioux Falls if you're flying in from Boston?
Answer : Of course you're not most people, but if you were, you'd stay roughly four days.
Question : Is price more important than specific travel days for you?
Answer : Wednesday is your cheapest day to fly in February. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : How often is the price changing when booking a trip from Logan International Airport (BOS) to Sioux Falls Regional Airport (Joe Foss Field) (FSD)?
Answer : Prices for BOS to FSD do fluctuate a lot more than most routes. However, the sooner you book, the better price you tend to get.