HOK’s design for the modernization, also known as the SEA Gateway Project, improves traveler flow and prepares Seattle-Tacoma International Airport (SEA) for global visitors during the FIFA World Cup this June.
Originally built more than 40 years ago, the North Main Terminal serving Alaska Airlines has been reconfigured by HOK and progressive design-build partner Hensel Phelps to streamline the traveler journey from curbside to security.
The Alaska-led program creates a double-height hall that reduces congestion and improves sightlines so travelers can easily see the next step in their journey. To do this, the project team relocated back-of-house services on a mezzanine level to a bridge level between the terminal and parking garage. The modernization also reclaimed underutilized curbside space, expanding the check-in hall’s footprint and consolidating entryways from the curbside that caused bottlenecks.
Consolidated entryways, improved wayfinding and larger circulation areas support travelers.
Floor-to-ceiling exterior windows enhance visibility and wayfinding, while wood-paneled finishes and curated local art create a bright, welcoming environment inspired by the Pacific Northwest.
Curated art adds vibrancy to the baggage claim in SEA’s North Main Terminal. Image by Ed Sozinho at Sozinho Imagery.
Alaska Airlines brought new automated bag-drop technology to the terminal that allows travelers to self-check bags quickly. This technology further opens up the check-in hall and creates a smoother traveler experience. Traditional staffed counters remain available, giving travelers choice in the bag check process. The upgraded security checkpoint also supports six screening lanes, with capacity to add a seventh as demand grows.
New automated self-tag baggage drop stations with roving Alaska Airlines agents optimize the check-in process. Image by Ed Sozinho at Sozinho Imagery.
Relocating back-of-house functions enabled the creation of a remote check-in facility, that allows travelers arriving from the garage or light rail to check their bags before proceeding directly to security.
“This project transforms one of SEA’s most important passenger areas into a clearer, more efficient gateway for travelers,” said Keith Hui, regional leader of Aviation + Transportation in HOK’s Seattle studio. “By opening up the terminal, improving circulation and integrating modern technology, the design helps create a seamless traveler experience.”
Clear open spaces between check-in and security processing add clarity in the traveler journey.
Approaching LEED Gold certification, the SEA Gateway Project incorporates high-performance HVAC systems, energy-efficient elevators and escalators, as well as advanced lighting controls designed to improve efficiency and support wayfinding.
Completed in advance of Seattle hosting the 2026 FIFA World Cup, Alaska’s modernized North Main Terminal creates a more welcoming and efficient experience for thousands of travelers arriving for the games and tens of millions of travelers who will benefit from the updates for decades to come.