With the addition of the new year-round routes, Allegiant will offer service from Indianapolis to 15 cities in the South and Southwest.
Allegiant, which opened a $40 million aircraft base at Indianapolis International Airport in February, experienced more than 100 serious mechanical incidents from January 2017 to October 2017, the TV news show reported.
The Sarasota service, which will operate year-round, begins April 11. The Charleston service, which begins April 6, will run seasonally from Easter to October or November.
The Las Vegas-based airline said the Indianapolis base will create 66 high-paying jobs and allow the company to offer more routes from Indianapolis in the future.
The route is one of 28 new routes that the Las Vegas-based airline plans to launch this year.
The low-cost airline in May will launch service to Austin and to Destin-Fort Walton Beach in Florida, with introductory fares to both destinations starting at about $60.
Allegiant will start offering the year-round flights between Indianapolis International Airport and Jacksonville International Airport on June 2.
The seasonal flights will operate twice weekly and will begin April 8. Allegiant is debuting the route with one-way promotional fares as low as $39.
OneJet, which debuted flights to Milwaukee in April, said it will begin flying to Pittsburgh next month. No other carriers offer nonstop service to those destinations.
Low-cost carrier Allegiant, which used to stick to the smallest, most underserved airports on the map, is branching out to medium-size cities like Indianapolis.