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Seattle Airport (SEA) Connection Guide: Navigating International to US Domestic Transfers at the New IAF
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Seattle-Tacoma International Airport (SEA) utilizes a distinctive arrivals and customs procedure that differs from most US hubs. To help smooth your journey, here is an essential step-by-step guide detailing the transit and entry procedures through SEA’s cutting-edge International Arrivals Facility (IAF).
Airport Transfer & Entry Map
Both paths require claiming your checked bags before clearing CBP. Photo / Port of Seattle
International Flights Centralized at Concourse S
Nearly all international long-haul arrivals at Seattle Airport are processed through Concourse S (the South Satellite) and connected gates, as this dedicated infrastructure channels passengers directly into the secure international processing corridor.
while arriving passengers walk across the pedestrian bridge to the IAF for border clearance. Photo / Port of Seattle
The Iconic Aerial Pedestrian Skybridge
Left: Concourse S; Right: Main Terminal. Photo / Port of Seattle
Photo / Port of Seattle
Photo / Port of Seattle
Photo / Port of Seattle
Step-by-Step Walkthrough After Deplaning
Photo / Port of Seattle
Claim Baggage First: The Bags-First Arrival Procedure
This streamlined system is the centerpiece of the IAF design.
Arrival Flow Diagram
Clearing U.S. Customs and Border Protection (CBP) can involve substantial wait times during peak international arrival banks. We strongly recommend using the restrooms before joining the queue, as processing is thorough and lines can be lengthy.
Clearing CBP Border Control
Queue management is dynamic and adjusted in real time based on passenger volume. Follow overhead electronic signage and airport ground staff instructions to enter the correct queue based on your citizenship and travel credentials.
- Single-Step Baggage & Border Check: Claim your luggage first, then wheel it with you to the CBP officer for combined passport control and customs declaration. Once cleared, proceed toward the exit (Seattle local arrival) or connecting flights.
- Strict Cellphone Policy: Because immigration and customs happen together with your bags, strictly observe federal regulations: photography, videography, and unauthorized mobile phone use are prohibited inside the CBP secure perimeter.
- Mandatory Entry Clearance for Transfers: The United States does not offer sterile international transit. Regardless of whether your final destination is Seattle or another domestic/international city, every traveler must legally enter the U.S. and clear CBP. Ensure you hold a valid visa or approved ESTA before travel.
The Fork in the Road: Seattle Exit vs. Connecting Flights
while the right channel is designated for Connecting Flights. Photo / Port of Seattle
Domestic Connection Procedure
Photo / Port of Seattle
Note: This dedicated transit checkpoint operates from 6:00 AM to 10:00 PM. Outside these hours, passengers must exit to the main terminal check-in hall to re-check bags and clear standard TSA security.
Once you pass the transfer TSA security checkpoint, you re-enter the sterile post-security airside concourse. Because U.S. domestic arrivals and departures mingle freely in the same concourse, you are free to leave the secure area if you have an extended layover and wish to explore downtown Seattle.
Exiting to Seattle (Final Destination)
Video Guide & Walkthrough
The original text of this article is in Chinese, translated and edited into English by AI.
本文の原文は中国語であり、AIによって日本語に翻訳・編集されています。
