Book by Thursday 03/15, One-way for as low as $49 from select cities.
https://www.southwest.c
21-day advance purchase required.
Purchase from March 13 through March 15, 2018, 11:59 p.m. in the respective time zone of the originating city.
Domestic travel valid April 3 through June 13, 2018, and August 21 through October 31, 2018. Travel to/from San Juan, Puerto Rico valid April 3 through May 17, 2018, and September 5 through October 31, 2018. International travel valid April 3 through May 17, 2018, and August 21 through October 31, 2018.
Domestic travel blacked out May 24-25, May 28, August 31 and September 3, 2018.
Domestic travel is valid only on Tuesdays, Wednesdays and Saturdays. Travel to Florida and Nevada and from Florida to Nevada is valid only on Sundays through Wednesdays. Travel from Florida and Nevada and from Nevada to Florida is valid only on Tuesdays through Fridays. Travel to/from San Juan, Puerto Rico is valid Monday – Thursday. International travel is valid Monday – Thursday. Travel to Cancun, Cabo San Lucas/Los Cabos and Puerto Vallarta is valid only on Sundays through Wednesdays. Travel from Cancun, Cabo San Lucas/Los Cabos and Puerto Vallarta is valid only on Tuesdays through Fridays. Travel to/from Mexico City; Liberia, Costa Rica and San Jose, Costa Rica is valid daily.