This just in from travel deal site Kayak.com: "Sister airlines Midwest Airlines and Frontier Airlines have teamed up to bring this powerful fare sale to some of your favorite cities nationwide. Even though our favorite groundhog, Punxsutawney Phil, predicted six more weeks of winter, this sale is good for travel well into spring. Flights start at just $49 each way. Make sure to purchase tickets by February 24."

Select Frontier Airlines each way fares from Los Angeles:

Denver$79
Colorado Springs $89
Aspen$99
Durango $99
Albuquerque$104
Wichita $109
Rapid City $109

Other Frontier Airlines each way fares from cities nationwide:
Denver - Salt Lake City $49
Kansas City - Denver $69
Chicago - Aspen $99
Las Vegas - Detroit $119
San Francisco - St. Louis$119
Dallas/Fort Worth - Portland $129
Atlanta - Los Angeles $159

Select Midwest Airlines each way fares from Los Angeles (based on r/t purchase):

Milwaukee$104
Madison $109
Grand Rapids$109
Flint $109
Kansas City$112
Des Moines $119
Appleton $124

Other Midwest Airlines each way fares from cities nationwide (based on r/t purchase):

Milwaukee - Minneapolis$49
Green Bay - Indianapolis $79
Omaha - Denver$59
Orlando - Minneapolis $84
Boston - Madison$79
Grand Rapids - Los Angeles $109
San Francisco - Kansas City $112

Book an end of the season ski trip or a warm spring fling, as tickets can be purchased for flights through June 9. To find the lowest rates possible, look to travel on the off peak days of Tuesday, Wednesday, and Saturday.