Sea-Tac Airport's special $12 game day coupon provides discounted parking for up to twelve (12) hours in Terminal Direct at the airport garage when there is a Sounders or Mariners weekend home game scheduled in April or May (Saturdays and Sundays only).
Parking at the airport is a great way to avoid the hassle and expense of parking downtown. Simply enter the garage via the Terminal Direct entrance and proceed to the 4th floor to park your vehicle. From there it's a short walk to the SeaTac/Airport Link Light Rail station (the garage is connected to the station via a pedestrian bridge). A quick ride on Link and you'll be at the stadium to enjoying the game.