I'm looking to travel from detroit to vegas from feb 17-21 and it seems that the only ones who fly direct are southwest, spirit, and delta. In general, I haven't had great experiences with spirit and would like to avoid them if possible. I have lots of points with chase, amex, and in avios. Do any of these transfer to southwest so I can use them to purchase the ticket?
Also, how many delta miles would i need for such a flight and do any of my points transfer to Delta?