The nationwide winter sale that was supposed to expire yesterday with Southwest Airlines has been extended for two more weeks. So you still have a chance to grab some seats on sale for travel between December 12, 2008 and February 28, 2009.

Here are some sample fares I found on their website(roundtrip with taxes and fees included):

• December 13 - December 17: Pittsburgh (PIT) - Denver (DEN), $260
• December 15 - December 18: New York (ISP) - Chicago (MDW), $139
• January 5 - January 8: Los Angeles (LAX) - Las Vegas (LAS), $119

A great feature on Southwest's website is the "Southwest shortcut to low fares" calendar. So if your dates are flexible, you can get the lowest fares for your next trip. Always check online before booking to ensure that you get the lowest fare.

For full terms, conditions and other destinations, check out Southwest Airlines.