I'm going there in april myself, out of Seatac, but then I live here. Parking is higher at seatac garages but they have a lot of cheaper parking with shuttles off-site. Look at WallyPark and Doug Fox. I'd go more by available convenient direct flights, and traffic depending on the time and day. I'd guess that Portland has fewer direct flights, I booked last week and only a few were left on Alaskan, Southwest only had direct flights at odd times and transfers left. Those were 5 hours instead of 2.
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