Southwest Airlines® Offers Domestic Fares Starting As Low As $49 One-Way And International Fares As Low As $99 ... PR Newswire (press release) 23 through Dec. 13, 2016 (Travel to Cancún, Cabo San Lucas/Los Cabos and Puerto Vallarta is valid only on Sundays through Wednesdays. Travel from Cancún, Cabo San Lucas/Los Cabos and Puerto Vallarta is valid only on Tuesdays through Fridays. |