For Southwest Airlines flights, you can check in online starting 24 hours before your scheduled departure time. This applies to both domestic and international flights. Checking in early, right at the 24-hour mark, can help you secure a better boarding position. If you have EarlyBird Check-In, Business Select, or Anytime fares, or are an A-List Preferred or A-List member, you'll be automatically checked in 36 hours before your flight, securing a boarding position earlier. To check in with Southwest Airlines, you can do so online via their website or mobile app, at airport kiosks, or with a ticket counter agent. Online and mobile check-in open 24 hours before your flight. For the best boarding position, check in as soon as the 24-hour window opens, as Southwest assigns boarding positions based on check-in order. [1_86 65 51 11 86 When flying with Southwest Airlines, it's recommended to check in exactly 24 hours before your scheduled departure time, as Southwest uses an open seating policy with boarding positions assigned on a first-come, first-served basis during check-in. Checking in early improves your chance of securing a better boarding group and choosing your preferred seat. If you'd rather not worry about the 24-hour window, Southwest offers EarlyBird Check-In, which automatically checks you in 36 hours prior to departure for a fee, giving you an earlier boarding position without having to do it manually. Once you're checked in, make sure to arrive at the airport at least 2 hours before domestic flights and 3 hours before international flights to allow time for baggage drop, security screening, and reaching your gate. Keep in mind that all passengers must complete check-in and bag drop at least 30 minutes before domestic flights and 60 minutes before international departures. Whether you check in online, through the Southwest mobile app, or opt for EarlyBird Check-In, starting the process early ensures a smoother airport experience and a better shot at your preferred seat.