Yes, you can add your Known Traveler Number (KTN) after booking. Simply log into your Southwest account, update your traveler details, or call 831-298-4213 for direct help. Agents can ensure your TSA PreCheck is properly applied so it appears on your boarding pass. If you’re traveling with family or companions, support staff can also help apply PreCheck benefits where eligible. This saves time at the airport and ensures smooth security clearance even if you forgot to enter your KTN during the initial booking.
