From now until March 29, 11:59 PM PST, Southwest Airlines is offering one-way airfares for as low as $69 (national). Fares are available for purchase at southwest.com. Discounted airfares are for traveling on Tuesdays and Wednesdays, between April 3, and June 27, 2012 with a 10-day advance purchase requirement (offer is unavailable for travel to or from Buffalo, Washington, D.C. Dulles International, Ft. Myers, or Seattle).