It’s generally more expensive to depart on a Thursday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.
Due to multiple factors, expect to potentially pay more when booking in January. For low rates, April can be a great choice for travel to Fort Smith. Flights to Fort Smith from Jacksonville in April are about $529 on average during April, but can be found for as low as $276.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Jacksonville to Fort Smith as you normally would.