From Nashville One-Way Fares as low as $67
Southwest.com

Book by 1/24. 21-day advance purchase required. Nonrefundable. Seats, travel days, and markets limited. Fares valid only on nonstop service. Domestic travel valid 1/29/19 – 5/22/19. Travel to/from San Juan, Puerto Rico valid 1/29/19 – 2/28/19, and 4/23/19 – 5/16/19. International travel valid 1/29/19 – 3/6/19 and 4/23/19 – 5/16/19. Points bookings do not include government fees from $5.60 per one-way flight.