Save at least $28 on 200 routes through March 2020. 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 from Atlanta, GA (ATL) with arrival in Nashville, TN (BNA) on October 30. Book this travel deal by October 17 for travel from October 29 through March 6. All prices, dates, and booking details were valid at the time of publication.