Seattle-Tacoma International Airport (SEA), commonly called Sea-Tac Airport, is the largest airport in the Pacific Northwest and one of the busiest on the U.S. West Coast. Located about 13 miles south of downtown Seattle, it serves as a major hub for Alaska Airlines and Delta Air Lines, offering nonstop service to more than 120 domestic and international destinations.

SEA Airport is known for its sustainability initiatives, art installations, and traveler-friendly layout. The airport consists of a central terminal connected to Concourses A, B, C, and D, plus two satellite terminals — North and South — connected via an automated underground train. With continuous upgrades to passenger facilities, Sea-Tac remains a leader in innovation and traveler experience.

Seattle-Tacoma International operates five main TSA security checkpoints:

• Checkpoint 1: Near Concourse A, typically used for Delta and international flights.
• Checkpoint 2: Near Concourse B, serving Alaska Airlines and several domestic carriers.
• Checkpoint 3: Central terminal area, offering TSA PreCheck and CLEAR lanes.
• Checkpoint 4: Adjacent to Concourse C, handling additional Alaska Airlines departures.
• Checkpoint 5: Near Concourse D, serving United, Frontier, and Spirit Airlines.

Security checkpoints usually open at 3:30 a.m. and close after the last departing flight, typically around midnight. Morning (5:00–9:00 a.m.) and evening (4:00–8:00 p.m.) hours are the busiest, so passengers are advised to arrive two hours before domestic flights and three hours before international.

Travelers can check live TSA wait times through the use community-driven platforms like Airport Security Status for real-time updates from fellow passengers.

What time do TSA checkpoints open at SEA?

How do I move between concourses at SEA?

Which airlines operate at Seattle-Tacoma International Airport?