That's the best price we could find for select routes on a comparable carrier by $27. Buy Now at DealBase Tips On the DealBase landing page, click "Southwest Airlines" in the top line to see this sale. We found this price on flights departing on March 17 from Nashville, TN (BNA) to Atlanta, GA (ATL). All prices, dates, and booking details were valid at the time of publication. Book this travel deal by February 20 for flights from March 3 through May 20.