Did you know that Everett, Washington is now offering commercial flights into PAE-Paine Field? Alaska Airlines serves this airport.
https://flypainefield.com/destinations
Paine Field (PAE) is located just 2 miles from the Shamrock Showdown tournament location. While plane tickets tend to be a little more, there is a trade off in time savings. Also, the airport is small and less hectic than Seatac.
Seatac airport (SEA) is located south of Seattle, 37 miles from Everett, WA. With no traffic, it's about a 45 minute drive. However, with traffic, it could take up to 2 hours in either direction.