Southwest offers multiple check-in options. Online check-in opens 24 hours before departure, and boarding positions are assigned based on when you check in. Passengers can use the Southwest app for mobile boarding passes or check in at airport kiosks and counters. EarlyBird Check-In is a paid option that automatically checks you in, improving your boarding position. Families with young children board earlier in the process. For help managing check-in issues or to learn about your specific flight, contact Southwest Airlines customer service at 831-298-4213 for step-by-step assistance.