SeaTac Terminal Map

The SeaTac terminal looks like an X, incorporating Concourses A to D, with the North and South satellites connected by train. The layout makes it easy for travelers to reach gates across the airport after clearing security. The terminal has ticketing, TSA checkpoints, baggage claim, gates, and amenities, and it connects to the parking garage and ground transportation areas. Use our SEA Terminal map to locate and navigate the terminal easily.

SEA consists of one main terminal with six concourses: A, B, C, D, N, and S. Concourses A, B, C, and D are attached to the main terminal, while N and S are in satellite buildings. The SEA Underground train system connects the concourses.

The terminal is roughly divided into north and south halves. Concourses A, B, and S are on the south side, and Concourses C, D, and N are on the north side. Travelers can walk between Concourses A, B, C, and D, but Concourses N and S are reachable only by the SEA Underground train.

SEA’s terminal design incorporates Pacific Northwest-inspired architecture, public art, natural light, and views of the surrounding region. The C Concourse Expansion, which opened in June 2026, adds new artwork, the Tree at C gathering area, a live performance space, and The Lookout at C.

The airport’s public art program includes installations across the terminal and concourses, and the SeaTac Terminal Map shows where to find them.

Central Terminal

The Central Terminal is the core of the SeaTac terminal and contains ticketing, security checkpoints, access to baggage claim, and connections to the concourses. You can also find dining, retail, lounges, ATMs, information services, nursing facilities, a children’s play area, restrooms, and water refill stations.

Check-in is not organized as separate ticketing halls for each concourse. Travelers can complete airline check-in and baggage drop at the main terminal ticketing area. The parking garage connects to the terminal by skybridges and is near the Link light rail station. Travelers arriving on shuttles from offsite SeaTac Airport parking are dropped off on the third floor of the parking garage, which connects to the terminal.

Concourses A and D at Seattle-Tacoma Airport are designed to handle both domestic and international carriers, while S is primarily for international flights. Concourses B and C include sub-gates to handle smaller aircraft that serve domestic flyers.

Airlines may use different concourses, so check your live flight status before arriving at SEA Airport.

Concourse A

Concourse A is at the south end of the terminal and has 16 gates: A1 to A14, A20, and A21. The current SeaTac Terminal map shows dining, retail, and passenger services, including nursing and sensory facilities, a children’s play area, a meditation room, ATMs, and water refill stations in Concourse A. Airline lounges include the Delta Sky Club, The Club at SEA, and the United Club.

TSA Checkpoints 1, 2, and 3 are the closest screening options for travelers heading toward the A gates.

Concourse B

Concourse B is on the south side of the Central Terminal and has 17 gates. Gates B1 through B15 are numbered in sequence, with B5A and B7A serving smaller aircraft and B20 and B21 located farther along the concourse.

TSA Checkpoint 4 is the closest security checkpoint to the B Gates. You can find dining, retail, ATMs, and a children’s play area in Concourse B. The nearest lounge is the Delta Sky Club in Concourse A.

Concourse C

Concourse C is on the north side of the main terminal. Concourse C includes gate groups C10A to C10F and C16A to C16F for smaller aircraft, along with standalone gates such as C3, C9, C11 to C15, C17, C18, and C20.

The concourse is connected to the SEA Underground. It includes eateries, passenger services, and an Alaska Airlines Lounge.

The C Concourse Expansion opened in June 2026 with four new floors between Concourses C and D. It adds dining, retail, public art, a nursing room, a sensory room, an Interfaith Prayer and Meditation Room, a performance area, and The Lookout at C, which has views of the airfield and the Olympic Mountains.

Concourse D

Concourse D is located on the north side of the main terminal and has 19 gates: D1 to D11, D6A, and D20 to D26. Gates D20 to D26 are in a lower-level annex reached by a connector near Gate D7.

You can find an Alaska Lounge and other amenities for Concourse D on the SeaTac Terminal Map. Checkpoints 4, 5, and 6 provide access to Concourse D.

Concourse N

The North Satellite, or Concourse N, is a detached structure north of the main terminal and is connected to the terminal by the SEA Underground. The current map lists numerous dining and retail choices, Alaska Airlines customer service, an ATM, a nursing room, a pet relief area, and an Alaska Lounge on the upper level.

Travelers heading to the N Gates should follow signs for the Green Line after clearing security, since Concourse N is reachable only by train.

Concourse S

The S Concourse, or South Satellite, is connected to the terminal by the SEA Underground’s Blue Line. Its map includes dining, duty-free and other retail, ATMs, Delta customer service, currency exchange, a nursing room, a pet relief area, vending, and water refill stations. Airline lounges include the British Airways Terraces Lounge and The Club at SEA.

Checkpoints 1, 2, and 3 are closest to the A and S gates. Checkpoint 1 and Checkpoint 3 offer TSA PreCheck, while other screening options vary by checkpoint and operating conditions.

SEA currently has six TSA checkpoints. The SeaTac TSA wait times and available screening services can change based on operations. Screening services and wait times vary by checkpoint, so make sure to check the live TSA wait times before you leave.

The SEA Airport parking garage is directly connected to the terminal by skybridges. The garage has multiple levels with designated areas for parking and ground transportation. You can use the Seattle-Tacoma Airport Map to find parking levels, pickup areas, and the skybridges to the terminal. You can also choose from several offsite parking options. For cheaper rates, reserve your SEA parking through Way.

The SEA Underground is the main train system connecting the main terminal and concourses. Inside the secure area, the SEA Underground connects Concourses A, B, C, D, N, and S. The Blue, Green, and Yellow train lines allow passengers to move between different parts of the airport.

• Blue Line (South Train Loop): Connects the S, B, and A Concourses.
• Green Line (North Train Loop): Connects the N, C, and D Concourses.
• Yellow Line (Terminal Shuttle): Runs between the A and D stations and connects the south and north train loops.

The train is especially important for travelers flying through N or S Satellite Concourses.

For extended layovers or during flight delays, travelers can explore some of the lounges at SEA. Eligible travelers can use the SeaTac Terminal Map to find these lounges and relax while checking their flight status. Some lounges are near departure gates, while others are on the Mezzanine level.

Apart from these lounges, travelers can also take a break or a short nap in meditation rooms and sensory rooms at multiple locations. You can find these locations on the SeaTac Terminal map for easier navigation.