To file a claim with Southwest Airlines in 2026 for lost, delayed, or damaged baggage, you should ideally start the process at the airport. Before leaving the baggage claim area, visit the Southwest Airlines Baggage Service Office to file a formal report (an Incident Report). If you have already left the airport, you must submit your claim online via the Southwest "Help Center" or mobile app within four hours for damaged luggage and within 21 days for lost or delayed items on domestic flights. For international travel, you typically have seven days for damage and 21 days for delay. You will need your confirmation number, flight details, and photos of any damage. If you are seeking reimbursement for "interim expenses" (like buying clothes while your bag is delayed), keep all original receipts and submit them through the same portal. Southwest’s 2026 policy emphasizes a digital-first approach, so tracking your claim status is usually done via a unique reference number provided once the initial report is filed.