Can I add my TSA PreCheck to an existing reservation United?

Written by Editorial Team | Last Updated: August 2026

Passengers can easily add their TSA PreCheck Known Traveler Number to an existing United Airlines flight reservation at any time prior to departure. This can be accomplished by logging into the official United Airlines website or mobile application, accessing the specific trip details using the confirmation code, and editing the traveler information section to insert the nine-digit KTN into the designated trusted traveler field. Alternatively, travelers can speak with a customer service agent at an airport ticket counter or self-service kiosk to update their profile information and ensure the PreCheck indicator prints correctly on their boarding pass.

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