How do I choose the correct dedicated North or South terminal shuttle when returning my rental car at SeaTac?

At Seattle-Tacoma International Airport (SEA), all on-airport rental brands operate from the consolidated Rental Car Facility at 3150 S. , SeaTac, WA 98188—about 1. 5 miles from the main terminal. After you finish returning your vehicle inside the facility, do not drive to the terminal. Instead, go to the passenger shuttle pickup zone on the opposite side of the building from where inbound shuttles drop off (near the facility's marked boarding bays). The Port of Seattle operates two separate return routes: a Dedicated North Terminal shuttle and a Dedicated South Terminal shuttle. You must board the bus that matches your departing airline's baggage-claim area. The North Terminal shuttle serves the north end of the lower-level arrivals drive, outside baggage claim near Carousel 1 and the Alaska Airlines zone—typical for Alaska Airlines, Delta Air Lines, and other north-side domestic carriers. The South Terminal shuttle serves the south end of baggage claim near Carousel 15 and the international-arrivals zone—used by most international airlines and many other domestic carriers such as Southwest, United, and American Airlines. Shuttles are free, run 24 hours a day, 365 days a year, and usually depart every 5 to 10 minutes. The ride back to the terminal takes about 5 minutes. Each bus is wheelchair-accessible and can secure 1 wheelchair per trip. Boarding the wrong shuttle can drop you at the opposite end of the terminal, adding 20 minutes or more if you must walk or use the SEA Underground train. Before boarding, confirm your airline on the bus signage or ask facility staff.