Southwest Airlines allows online check-in starting 24 hours before scheduled departure and closing approximately 60 minutes before the flight. Checking in exactly at the 24-hour mark is important to secure a better boarding position since Southwest does not assign seats. Passengers may also purchase EarlyBird Check-In, which checks them in automatically 36 hours before departure. Airport check-in desks and self-service kiosks usually open 3 hours before departure and close 30 minutes before domestic flights and 60 minutes before international flights. Curbside check-in is available at many airports and follows similar timing. For domestic flights, Southwest recommends arriving at the airport at least 2 hours early to allow enough time for baggage drop, security screening, and boarding. For international flights, passengers are advised to arrive 3 hours before departure to complete passport checks, documentation, and customs processing. Baggage drop closes 45 minutes before domestic flights and 60 minutes before international flights. Boarding usually begins 30 minutes before departure, and gates close 10 to 15 minutes before the flight. If passengers miss the gate closing time, they will not be allowed to board. For international travel, especially from large or high-traffic airports, some travelers report being told to arrive up to 4 hours early due to long lines and document checks. If a passenger is traveling with pets, unaccompanied minors, or requires special assistance, extra time may be needed at check-in. All passengers should ensure they have their travel documents, boarding passes, and checked bags ready well in advance of these deadlines to avoid delays.