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Southwest Airlines via DealBase discounts select 1-Way Nationwide Fares, with prices starting from $48.98. (On the DealBase landing page, click "Southwest Airlines" in the top line to see this sale.) That's the lowest price we could find for select routes by $23. This price is valid on flights departing from Atlanta, GA (ATL), with arrival in Nashville, TN (BNA) on May 29. Book this travel deal by May 2 for travel from May 21 through October 30. Prices, dates, and booking details were valid at the time of publication.