For travelers flying with Delta Airlines SEA Terminal in particular, the SEA subterranean, the airport’s subterranean train system, is essential to moving quickly and confidently across its expansive terminals. Most passengers will have to take the underground train at least once to go to their gate because Delta mostly uses Concourse A and the South Satellite. The three color-coded lines in the system are Red, Blue, and Yellow. Delta customers usually take the Blue Line to get from Concourse A, the main terminal, to the South Satellite. Trains depart every few minutes, and it’s simple to find the correct direction and prevent delays thanks to digital displays, audible announcements, and clear signage.

Knowing the SEA Underground can make the difference between a leisurely walk and a hurried run to your gate for passengers who are unfamiliar with SEA or who are pressed for time during a layover. Thankfully, the entire system is built with ease of use and efficiency in mind. It features elevators, escalators, accessible platforms, and quick trip times (often less than five minutes between stops). In addition to the regular presence of Delta employees and airport volunteers to support passengers, smartphone apps and up-to-date airport maps can also make your journey easier. Understanding SEA’s underground transit system will guarantee a stress-free and seamless journey to your Delta gate, whether you’re coming, departing, or connecting.