Definitely agree with conniehar90.....many times over the years I've seen the lowest fare sold out and if the higher fares aren't selling, SW has released more seats to the Wanna Get Away fares.....however, be cautioned.....this usually happens during less traveled seasons. You usually will not encounter this scenario over a holiday, spring break, etc. We just traveled from Newark to Phoenix on Sat 1/12 (low travel time) with SWA and had Wanna Get Away fares available the night before our flight.....actually, they were probably available right up to boarding.....since we had 99 people on board a flight which had 143 seats...it was awesome since we all had the middle seat to stretch out for the 5 1/2 hr flight. However, on our return trip 1/18 every seat was booked.....so it really it the luck of the draw.