GOLD is available flights on UAL for 35,000 Miles, or 20,000 + $170. There are just a few remaining seats!
WHITE has seats available for 70,000 miles. There are no non-stop UAL flights on Sunday the 20th.
This screenshot is from 1/21/2011.

Flights are booking up!

I just reserved a flight on Alaska Air non-stop from SFO to PVR for $437 inclusive.

For the same dates, United was $500.  

Sorry, but I was not able to get group discount numbers b/c of blackout dates. The following week is Spring Break for some schools, so I doubt that prices will go lower, and flights will get fully booked.  Hopefully, most of the Spring Breakers will stay in Puerto Vallarta. 

THE FLIGHTS ARE GETTING CLOSE TO FULL !  

especially on the 16th and 17th.