You can do better!! I live in Boston and fly into SF and Las Vegas quite often, and have yet to pay over 245 dollars roundtrip. Expedia, Priceline (if you don't have a time agenda for leaving/arriving times), and Hotwire are all excellent. I like hotwire personally- got a 215 dollar LV to Boston ticket, and also booked a weekend at the Logan Hilton for $95 a night which is about $100 cheaper than their usual rates. Good luck hunting!!!