It is advised to be to Terminal 1 of San Francisco International Airport (SFO) at least 90 minutes in advance of a domestic Southwest Airlines aircraft. This gives ample time for luggage drop-off, security check-in, and check-in. Southwest Airlines SFO Terminal you might save time if you have TSA PreCheck or have checked in online, but a more seamless experience is guaranteed if you arrive early. Before boarding, travelers can unwind at Terminal 1, often called Harvey Milk Terminal, which has a variety of services like dining and shopping. Making an early arrival guarantees a stress-free start to your vacation and helps prevent any potential delays.