To check the balance of a Southwest Airlines LUV Voucher in 2026, you must use the "Check Travel Funds" tool on the Southwest website or mobile app. Unlike Flight Credits, which are often linked to your Rapid Rewards account, LUV Vouchers are specific 16-digit codes with a 4-digit security code (PIN). You will need to enter both of these numbers, along with your name, into the search tool to see the remaining value and the expiration date. It is critical to note that LUV Vouchers do expire (typically one year from issuance), whereas standard Southwest Flight Credits now have no expiration date. If you cannot find the code, you should search your email for "LUV Voucher" from Southwest Airlines. If you have a Rapid Rewards account, some vouchers may be visible in your "My Account" section under "Payment Methods" or "Travel Funds," but for a definitive real-time balance, the manual check tool is the most reliable method to ensure your credits are still valid for your 2026 travel planning.