Southwest Airlines Wednesday said it will extend through Jan. 12 a fare sale to all published destinations it serves from Salt Lake City, Chicago, St. Louis, Baltimore and Cleveland.

A Southwest spokesman said the seven-day, advance-purchase tickets are for travel Jan. 4 through March 15. Tickets may be purchased one-way and do not require an overnight or weekend stay. Tickets are nonrefundable, but reusable and may be upgraded. Seats are limited.The same sale is being introduced for the first time in Kansas City, Indianapolis, Louisville, and Columbus.

During the sale, sample one-way fares cited by Southwest from Salt Lake City to Boise, Las Vegas and Reno/Tahoe will be $19. Fares to Spokane and all California cities will be $29. Fares to St. Louis will be $59 and to Chicago $95.