Due to multiple factors, expect to potentially pay more when booking in October. For low rates, May can be a great choice for travel to Sioux Falls. Flights to Sioux Falls from McAllen in May are about $384 on average during May, but can be found for as low as $185.
It’s typically best to fly out from McAllen to Sioux Falls in the morning. Doing so could potentially save you 14% on the flight price compared to flying at noon, which is usually more expensive.
Flying to your destination on a Thursday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Sioux Falls. Check prices with Cheapflights to find a great deal for your trip.