Detailed Seattle Airport Terminal Guide 2026

Last Updated on Oct 1st, 2026 by Neha Sharma, Leave a Comment

Seattle-Tacoma International Airport, commonly known as Sea-Tac or SEA Airport, is one of the major airports in the United States. The airport serves domestic and international passengers through its Main Terminal, four concourses and two satellite buildings.

This Seattle Airport terminal guide explains the airport layout, concourses, airline locations, international arrivals, passenger facilities and terminal navigation tips.

Overview of Seattle Airport Terminals

Seattle-Tacoma International Airport has a Main Terminal with four concourses: A, B, C, and D. It also has two satellite buildings: the North Satellite and South Satellite.

The satellite buildings are connected to the Main Terminal through the SEA Underground automated train system. Passengers can use this system to move between the main concourses and satellite areas without leaving the secure airport zone.

Seattle Airport Concourse and Gate Breakdown

The airport’s gate distribution is generally arranged as follows:

• Seattle Airport Terminal A: 16 gates
• Seattle Airport Terminal B: 17 gates
• Terminal C Seattle Airport: 27 gates
• Terminal D Seattle Airport: 17 gates
• North Satellite: 20 gates
• South Satellite: 14 gates

Gate numbers and airline assignments may change because of airport operations, construction, seasonal schedules or airline requirements. Passengers should check their boarding pass and the latest airport information before travelling.

Non-precleared international arrivals generally use the South Satellite or Concourse A for border processing.

Seattle Airport Main Terminal and Concourses

Concourse A

Concourse A serves a range of domestic and international services. It is also associated with international arrivals that require customs and border processing.

Passengers using Concourse A can access the airport’s main terminal services, security areas, passenger walkways and connections to other concourses.

Concourse B

Concourse B handles several domestic airline services, including Southwest Airlines flights. Passengers should confirm the latest gate assignment because airlines may use different gates depending on the flight schedule.

Concourse C

Concourse C is an important operating area for Alaska Airlines and other domestic services. It also connects with the North Satellite through the SEA Underground system.

Concourse D

Concourse D is another main concourse at Seattle Airport and serves selected domestic and international operations. The exact airline and gate assignment can vary by flight.

North Satellite

The North Satellite is connected to the Main Terminal by the SEA Underground train. Alaska Airlines operates many services from this area, but you should always check the exact gate assignment before departure. 

South Satellite

The South Satellite handles several international operations and is connected to the Main Terminal through the SEA Underground. Non-precleared international arrivals may use this area for customs and immigration procedures. 

Airlines and Their Terminals at Seattle Airport

Seattle Airport does not use separate airline terminals in the same way as some other airports. Airlines generally operate from specific concourses or satellite buildings within the wider SEA Airport terminal system.

Alaska Airlines at Seattle Airport

Alaska Airlines primarily operates from Concourse C and the North Satellite. Passengers searching for the Seattle Airport Alaska Airlines terminal should check their boarding pass for the exact concourse and gate.

Delta Airlines at Seattle Airport

Delta Air Lines mainly uses Concourse A and may also operate from the South Satellite for selected services. Passengers should confirm the assigned concourse before reaching the airport. 

Southwest Airlines at Seattle Airport

Southwest Airlines commonly operates from Concourse B at Seattle Airport. Gate assignments can change, so passengers should check the latest flight information. 

United Airlines at Seattle Airport

United Airlines uses areas within the Main Terminal, including Concourse A and Concourse B for selected services. The exact departure concourse depends on the flight.

Air Canada at Seattle Airport

Air Canada operates from the Main Terminal area, with Concourse A commonly associated with its services. Passengers should confirm the current gate and concourse on their travel documents. 

JetBlue at Seattle Airport

JetBlue operates selected services from the Main Terminal, including Concourse A. Flight-specific terminal and gate information should be checked before departure.

International Airlines at Seattle Airport

International airline operations may use Concourse A or the South Satellite. Non-precleared international arrivals generally go through the required customs and immigration process before entering the public arrivals area.

The original keyword-focused lines such as “Seattle Airport Alaska Terminal” and “Seattle Airport Delta Terminal” have been rewritten into natural airline and concourse sections to avoid keyword stuffing.

Seattle Airport Domestic and International Flights

1. Domestic Flights

Domestic flights at Seattle Airport operate through the Main Terminal concourses and may use the North Satellite depending on the airline and flight. Passengers should complete check-in and security screening before proceeding to the assigned gate.

2. International Flights

International departures may use Concourse A, the South Satellite or another assigned gate area. International passengers should allow extra time for check-in, security, document checks and boarding procedures.

International arrivals that are not precleared generally go through customs and immigration procedures at the South Satellite or Concourse A. 

Seattle Airport Terminal Transfers

Passengers can move between the Main Terminal, concourses and satellite buildings using the SEA Underground automated train system. The system is designed to help passengers travel between different gate areas while remaining within the airport’s secure zone.

Passengers should allow enough time for the transfer, especially when connecting between different airlines or when international border procedures are required.

If your journey includes separate domestic and international tickets, you may need to collect baggage, complete check-in again and pass through security or immigration procedures. Check the instructions provided by your airline before travelling.

Seattle Airport Facilities & Services

Seattle Airport provides a variety of passenger facilities across the Main Terminal, concourses and satellite buildings. Detailed information about specific services can be covered through supporting guides.

Food and Dining at Seattle Airport

Passengers can access restaurants, cafés, takeaway outlets and other food options throughout Seattle Airport. Dining choices vary by concourse and satellite building.

For detailed information about restaurants and food options, see our dedicated Seattle Airport food guide.

Seattle Airport Lounges

Seattle Airport has an airline and independent lounge for eligible customers. Access may be limited based on the airline, class of travel, membership, or other entry conditions.

For specifics on the lounge locations, amenities, and access, see our comprehensive guide to Seattle Airport lounges.

Seattle Airport Parking

Upon arriving at Seattle Airport, there is parking available for passengers, visitors, or those dropping off and collecting friends and family. The appropriate parking depends heavily on the duration of your stay and whether you need quick access to the terminals.

To learn more about parking and directions, consult our Seattle Airport parking guide.

Seattle Airport Terminal Map

A map of the Seattle Airport terminal can assist passengers with the Main Terminal, Concourse A-D, North and South Satellite security baggage claim, and transport connections.

See our comprehensive Seattle Airport terminal map guide and navigation info for detailed terminal layouts.

Seattle Airport Hotels and Nearby Accommodation

Passengers with long layovers, early departures or late arrivals may consider accommodation near Seattle Airport. Hotel availability and airport transportation options vary, so passengers should check the location and transfer arrangements before choosing a property.

Seattle Airport Security Checkpoints

There are 14 TSA security checkpoints for passengers departing the Seattle Airport Main Terminal. The availability of screening options and opening times can change based on airport operations.

Passengers need to arrive sufficiently early to check-in, check baggage and go through the security screening and then arrive at the departure gate.

Seattle Airport to Seattle Cruise Terminal

Transportation for passengers traveling from Seattle Airport to the Seattle Cruise Terminal, including Pier 91, includes taxis, ridesharing services, private transfers, or public transportation.

The distance and journey time will be subject to traffic, the route and the cruise terminal used, so passengers need to add extra time when travelling for a set cruise departure.

Seattle Airport to the Ferry Terminal

From Seattle Airport to the ferry terminal passengers, can take the Link Light Rail bus taxi, rides, via, services, or private transfer; the most appropriate based route is ferry terminal and sailing time.

Passengers should compare current timetables and plan for walking, transferring and boarding.

Popular Routes from Seattle to India

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• Seattle to India Flight
• Seattle to AMD Flight
• Seattle to BLR Flight
• Seattle to MAA Flight
• Seattle to DEL Flight
• Seattle to HYD Flight
• Seattle to CCU Flight
• Seattle to BOM Flight

Popular Routes from India to Seattle

• ATQ to Seattle Flight
• BLR to Seattle Flight
• MAA to Seattle Flight
• DEL to Seattle Flight
• HYD to Seattle Flight
• CCU to Seattle Flight
• BOM to Seattle Flight
• PNQ to Seattle Flight
• India to Seattle Flight

Conclusion

Seattle-Tacoma International Airport has a connected terminal system, which included the Main Terminal, Concourses A-D, North Satellite and South Satellite. It will help if you know about the airport layout and check where your concourse is.

Passengers traveling with Alaska Airlines, Delta Air Lines, Southwest Airlines, United Airlines, or a foreign company should verify the airline on your ticket or baggage claim check for updated concourse and gate information.

Frequently Asked Questions

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Our touring team is available to help with route selection, fare information, flight schedules, and other travel questions. Call us to talk through how you’d like to travel from Seattle to India.

*Disclaimer: All brand names and trademarks mentioned are the property of their respective owners and are used for educational purposes only. We do not promote, endorse, or criticise any brands. Their use is solely for reference and informational context.

About Neha | View Posts

Neha Sharma, a passionate travel blogger with more than 2 years and 6 months of experience, captures the beauty of the world through her words. With her adventurous spirit and a keen eye for detail, Neha takes her readers on mesmerizing journeys to exotic destinations. Her vivid descriptions and insightful tips make her the go-to guide for wanderlust seekers. Join Neha as she explores the globe, sharing her love for travel and inspiring others to go on their unforgettable adventures.