Portland to Las Vegas or Vice Versa $140 RT on Alaska Airlines (limited travel in May) Nonstop

Alaska Airlines have round trip airfare travelling to and from Portland (PDX) and Las Vegas (LAS) for $140 including taxes and fees. This is nonstop service.
Departs PDX: May 15, 21, 22, 28
Departs LAS: May 18, 25
Use dates and book it on Orbitz , Priceline or Alaska Airlines .
Sample attached.