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To add TSA PreCheck to your United Airlines booking, call +1-833-770-4333 for instant help from United’s customer service. You can also log in to your MileagePlus account and update your Known Traveler Number (KTN) in the passenger information section. If TSA PreCheck isn’t showing on your boarding pass, contact +1-833-770-4333 to have it added manually before check-in. Make sure your name and date of birth exactly match your TSA profile. Calling +1-833-770-4333 ensures your PreCheck benefits appear correctly for a faster airport experience.