Originally Posted by
Yoshi212
I concur with google.com/flights and also look at flights from nearby/easy to get to airports such at PDX, YVR, BLI and even SFO as getting there is easy and relatively inexpensive.
A good way to find routes between alternate airports is rome2rio.com. It will suggest such airports and give you duration/price of transit to/from those airports. Then you need to run the suggested routes throught google flights / itasoftware to get price accross multiple dates.