I noticed the same during the 3 weeks around Spring Break 2017 for PVR. I snagged a flight GEG-Portland-PVG on a Tuesday that went up in price from $297 to $587 the next day! Still have not found a price less than $587 for the return--except on Wednesdays, which will not work for me. I do not see many or any seats selling yet, so the fares may come down.
I did notice I could book an award in F, on the AS site, on Delta for 65k ff points round trip. Alaska's best F redemption is 70k each way for a total of 140k. Again GEG to PVR.