Southwest Airlines offers new non-stop service between select cities in the U.S. with prices starting at $68.80. (Click on "Southwest" under "Booking Tips"; all taxes are included.) That's the lowest base rate we could find for select flights by $86. This price is valid on flights departing from Dallas, TX, (DAL) to Harlingen, TX, (HRL) on December 10; prices vary depending on the travel cities and dates chosen. Blackout dates may apply, and a 14-day advance purchase may be required. Book by November 17 at 2:59 am ET for travel through February 13, 2013.