San Francisco International Airport (SFO) is one of the busiest and most traveler-friendly airports in the United States, welcoming millions of passengers every year. For budget-conscious flyers, Frontier Airlines offers an affordable way to travel across the U.S. and beyond. But when it comes to navigating large airports like SFO, knowing exactly where your airline operates can save you time and confusion. That’s why this blog will walk you through everything you need to know about the frontier airlines sfo terminal , from check-in to takeoff.