If you're going to spend all that money on a plane ticket anyhow why don't you just go to whistler? I say this because washington doesn't have "resorts", we have ski areas with little or no lodging. Plus, if you really want to you can still hit up baker because it isn't that far away.
That being said, i love the fact that ski areas in WA aren't giant shopping malls/condo developments. I think all the development somewhat ruined Colorado. So, if you're purely looking for skiing, fly into seattle, rent a car, drive to baker, stevens, alpental, and crystal and stay as close as you can to the mountains.
I'm certainly uncertain, at least I'm pretty sure I am.