For a Southwest Airlines flight, checking in early is very important because seats are not assigned ahead of time. Instead, boarding positions are given based on when you check in, starting 24 hours before your flight’s departure. The earlier you check in within that 24-hour window, the better your boarding group and position will be. Southwest divides boarding into groups A, B, and C, each with numbers from 1 to 60. People who check in right at the 24-hour mark usually end up in group A or early in group B, which allows them to choose from a wider selection of seats once on board. If you wait too long to check in, you may find yourself in a later boarding group, which can mean fewer available seats and limited space for your carry-on bag in the overhead bins.

You can check in on the Southwest Airlines website, through their mobile app, or at an airport kiosk. Most travelers prefer to check in online to avoid airport lines and get a better spot in the boarding order. If you want to skip the 24-hour reminder, Southwest also offers EarlyBird Check-In, a paid option that automatically checks you in 36 hours before your flight. While this does not guarantee a boarding spot in group A, it usually places you ahead of those who check in manually at the 24-hour point. EarlyBird Check-In is a helpful choice for busy travelers who don’t want to worry about remembering to check in.

If you’re traveling with checked luggage, Southwest recommends arriving at the airport at least two hours before departure for domestic flights and three hours before for international routes. Bags must be checked no later than 45 minutes before takeoff, or you risk missing your flight even if you’ve already checked in. For those traveling with only carry-on luggage, you can go straight to security after checking in online and having your mobile or printed boarding pass ready. Giving yourself extra time at the airport is a good idea during busy times like holidays, weekends, or early morning flights.

Overall, checking in exactly 24 hours before your flight gives you a better chance at a good boarding position and a smoother travel experience. If you don’t check in early, you might still board, but your seat choices will be limited and boarding may be slower. Whether you choose to check in manually at the 24-hour mark or use EarlyBird Check-In, planning ahead helps make the process easier. Always be aware of the airline’s check-in rules and deadlines so you don’t miss your flight. With Southwest’s open seating policy, early check-in plays a key role in getting the seat and overhead space you want. Being on time and prepared helps ensure a more relaxed and comfortable start to your journey.