After much research trying to decide when to book our flights to Vegas for September I am more confused than I was when I started. We flew to Vegas in January last year for $500 roundtrip total and now rates are over $170 more. We booked way in advance then and the price never dropped. The theory I get from research is that about two months out is the perfect time to book. However, I can check flight prices for May and June and they are the same as the prices for September. Does that mean I should book now?