What's the best site to find last minute plane tix?

I am trying to find cheap plane tickets for either next weekend or the weekend after next from either of these aiports: SFO, OAK, SJC and I'm travelling to STL

I am looking for either a package deal (with hotel) or just the plane ticket for under $400.

If anyone can reccommend a good site that would be very helpful.

Thanks!What's the best site to find last minute plane tix?I think your best sources in this case are:

http://www.farecompare.com

http://www.site59.comWhat's the best site to find last minute plane tix?Good luck. The closer to departure, the more expensive. They want to get you for waiting til the last minute. You can try www.bt-store.com though.What's the best site to find last minute plane tix?try cheapticket.com or cheapflights.com I found a really good deal with orbitz.com tooWhat's the best site to find last minute plane tix?
I actually am an Orbitz junkie, but a friend of mine put me on to Kayak.com, which is slighlty less than Orbitz, so I would give that a whirl!