LA to Vegas $29If you still haven't tried JetBlue, you really really should. Their "deal fares" are the real deal. Some airlines post these bait and switch prices like used car guys have one car on the lot (allegedly) that is a steal. Then you get there and there's no car to be found, or it's already been sold, they say.
JetBlue really does have fares this low and a lot of other very low fares to lots of cities too. And no, I'm not being paid by them or anything to say this. I just think they are great.