Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Sioux Falls to North Dakota as you normally would.
In terms of precipitation, rainfall in North Dakota ranges from 0.6 - 3.9 inches per month. June is typically the wettest month, when rainfall can reach 3.9 in. February is typically the driest time to visit North Dakota when rainfall is around 0.6 in.
If weather is an important factor for your trip to North Dakota, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 8.6 F).