That's the best price we could find for select routes by at least $28. Buy Now Tips On the DealBase landing page, click "Southwest Airlines" in the top line to see this sale. We found this price on flights departing from Atlanta, GA (ATL) with arrival in Nashville, TN (BNA) on October 8. Book this travel deal September 12 for travel from September 24 through March 5. All prices, dates, and booking details were valid at the time of publication.