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Security lines at Seattle-Tacoma International Airport (SEA) can vary depending on the time of day, passenger load, and checkpoint activity. To avoid delays, travelers should arrive two hours before domestic flights and three hours before international flights. SEA Airport offers expedited security programs like TSA PreCheck, CLEAR, and SEA Spot Saver for a faster screening process. For real-time updates, check the flySEA App or the SEA Airport website. For more insights, explore our related blog on Wait Times at Seatac.