That's the best price we could find for select routes by at least $16. 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 Nashville, TN (BNA) with arrival in Atlanta, GA (ATL) on January 22. Book this travel deal by January 2 for travel between January 14 and May 20. All prices, dates, and booking details were valid at the time of publication.