Louisville to Detroit. New Spirit non-stop light launching this summer.
Spirit Airlines is expanding service at Louisville Muhammad Ali International Airport with direct flights to Detroit.
The Indianapolis Star17d
Spirit Airlines adds 3 new nonstop routes out of Louisville. Here's where you can fly
The airline is also resuming nonstop service to Los Angeles starting May 1. Last year, the Louisville airport had its busiest year for passenger traffic with over 4.8 million passengers.