How do the dedicated North and South terminal shuttle loops work when returning from the SeaTac Rental Car Facility?

When you return a rental vehicle at the SeaTac Rental Car Facility (CONRAC) at 3150 S 160th St, SeaTac, WA 98188, the free 24/7 shuttle operation splits into two dedicated loops—a North Terminal loop and a South Terminal loop—rather than running a single combined route. After drop-off, walk to the bus plaza outside the customer service counters and board the shuttle labeled for your airline's terminal side. The North loop serves travelers flying Alaska Airlines and other carriers clustered at the north end of the main terminal, dropping passengers on the lower baggage-claim drive near Carousel #1 on Island 1. The South loop serves international airlines and carriers at the south end, with drop-offs near Carousel #15 on Island 16. Per the Port of Seattle, each leg is a short drive of about five minutes under normal traffic, though CONRAC operators typically budget 5–8 minutes off-peak and 10–15 minutes during peak periods. Shuttles depart every 5–10 minutes around the clock, 365 days a year. Choosing the wrong loop does not change your fare—the service remains free—but it places you at the opposite end of the main terminal, often adding 10–15 minutes of walking or a transfer on the SEA Underground train to reach your airline counter. Before boarding, confirm your airline's terminal assignment on your boarding pass or the flySEA app, then match it to the clearly signed North or South shuttle queue.