Flights on Virgin America are 20% off via a promo code for flights that fly from March 17th until April 7th. Tickets must be purchased today from Virgin America. Promotion is not available via 3rd parties (example: Expedia, Travelocity, etc..).
Virgin America does not serve Houston (IAH / HOU), but I was able to get a flight from Austin (AUS) to San Francisco (SFO) for $170 by using this code for a March 22nd to April 04th non-stop round-trip which is about $200 cheaper than the flight out of Houston.
You must use code LEISURE20 during booking.
Full details are on the Virgin America promotional page.
