Southwest Airlines plans to add a nonstop flight between Raleigh-Durham International and St. Louis this spring.

The move follows an announcement last month by American Airlines that it was pulling the plug on its nonstop between the two cities. American currently operates the only nonstop to St. Louis from RDU but said it would end that flight next year as it focuses expansion at larger airports.

Southwest will offer one nonstop daily between RDU and Lambert International beginning in May. Tickets will go on sale starting in December.