There is no official release date yet for February 2019, but flights for February 2018 went on sale on June 22, 2017 (when Southwest released its schedule from early January through March 7). Given that the next schedule release date on May 31, 2018 will only include flights through January 6, 2019, it seems likely that the February schedule will be released around the same time as it was last year (June 22) or perhaps a week or two later than that. On May 31, you should be able to see the next schedule release date (which would likely include February) at the following link: https://www.southwest.com/air/flight-schedules/index.html
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