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Southwest Airlines via Dealbase offers 1-way fall and winter nationwide fares with prices starting from $48.98. That's the lowest price we could find for select fares by at least $28. Book this travel deal by September 12 for travel from September 24 through March 5, 2020. Buy Now Tips We found this price on flights departing from Atlanta, GA (ATL) with arrival in Nashville, TN (BNA) on November 5. On the DealBase landing page, click "Southwest Airlines" in the top line to see this sale. All prices, dates, and booking details were valid at the time of publication.