Seattle–Tacoma International Airport (SEA) – Live TSA Wait Times & Traveler Updates

Q: What time do TSA checkpoints open at SEA?

Most security checkpoints open around 3:30 a.m., though specific times may vary depending on flight schedules. Checkpoint 1 and Checkpoint 2 tend to open earliest for early morning departures.

Q: How do I move between concourses at SEA?

Travelers can use the Satellite Transit System (STS) — an underground train — to move quickly between the main terminal and the North/South Satellite gates. Walking paths connect most domestic concourses.

Q: Which airlines operate at Seattle-Tacoma International Airport?

Alaska Airlines maintains its primary hub at SEA, with extensive West Coast and transcontinental routes. Delta Air Lines operates a major hub as well, providing direct flights across the U.S., Asia, and Europe. Other airlines include United, Southwest, Spirit, and British Airways.

About Seattle–Tacoma International Airport (SEA)

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.

Security Checkpoints and Terminals at Seattle Airport (SEA)

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.

Frequently Asked Questions about Seattle Airport

What time do TSA checkpoints open at SEA?

Most security checkpoints open around 3:30 a.m., though specific times may vary depending on flight schedules. Checkpoint 1 and Checkpoint 2 tend to open earliest for early morning departures.

How do I move between concourses at SEA?

Travelers can use the Satellite Transit System (STS) — an underground train — to move quickly between the main terminal and the North/South Satellite gates. Walking paths connect most domestic concourses.

Which airlines operate at Seattle-Tacoma International Airport?

Alaska Airlines maintains its primary hub at SEA, with extensive West Coast and transcontinental routes. Delta Air Lines operates a major hub as well, providing direct flights across the U.S., Asia, and Europe. Other airlines include United, Southwest, Spirit, and British Airways.