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!

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