How to add Known Traveler number to a flight already booked?

You can also update existing reservations with your TSA PreCheck number. Go to Edit Traveler Information in the Manage Reservations section on the website, at an airport kiosk or in the United app.



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Log into your flight reservation under the Traveler Info section and add your KTN there. You must have been approved for TSA PreCheck before you booked the flight in order for it to be used during a trip.

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If you still do not have a TSA PreCheck indicator on your boarding pass, please call the TSA Contact Center at (866) 289-9673, submit an online form, or contact us at @AskTSA on Twitter and Facebook Messenger.

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You can also update existing reservations with your TSA PreCheck number. Go to Edit Traveler Information in the Manage Reservations section on the website, at an airport kiosk or in the United app.

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To do so, click on Manage Trip for each reservation. Then, click on Add/Edit Passenger Information to add your PreCheck number.

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Yes, you will. I did the same thing a few months ago. My old TSA KTN will expire soon, but for the last 6 months or so, I've had two KTNs (Known Traveler Number). I've used the overlap period to make sure all of my travel accounts are updated with the new number to insure a smooth transition when my old one expires.

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If you wish to include an additional traveler, you will need to make a separate booking.

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Most airlines instruct you to log in to your profile and edit your existing reservation in order to add your KTN. For Frontier Airlines, log in to My Trip and have your confirmation code ready. Likewise, you need to go to My Trips to update your existing reservation with Spirit.

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A Known Traveler Number (KTN) is issued to all individuals approved to receive TSA PreCheck® expedited screening. The KTN must be added in the KTN field when booking airline travel reservations to have the TSA PreCheck® indicator appear on your boarding pass.

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TSA PreCheck® is available when you depart from a U.S. airport to a foreign country, and for domestic, connecting flights after you return to the United States. If you travel internationally four or more times a year, consider enrolling in Global Entry instead of TSA PreCheck®.

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Valid Proof of Citizenship
  • U.S. Birth Certificate.
  • U.S. Certificate of Citizenship (N-560 or N-561)
  • U.S. Certificate of Naturalization (N-550 or N-570)
  • U.S. Citizen Identification Card (I-179 or I-197)
  • Consular Report of Birth Abroad (FS-240)
  • Certification of Report of Birth Abroad (DS-1350 or FS-545)


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If you are a member of the TSA PreCheck® Application Program, look up your Known Traveler Number (KTN) here. If you are a member of another trusted traveler program, such as Global Entry, NEXUS, or SENTRI, log on to the Trusted Traveler Program website to obtain your PASSID, which is your KTN.

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Go to the TSA PreCheck website and select the tab that says “Renewal” to begin the process. Provide your KTN, date of birth and legal last name. You'll then be guided through a series of screens that will ask you to confirm your address and passport information and answer some security questions.

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If you received your KTN after booking an existing airline reservation, you may add it at the boarding counter, or at the self-service kiosk at the airport.

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On the Trips screen of the app, select the existing trip to which you want to add the number. Find the names of the passengers included in the reservation. Click on a name to see the TSA numbers link, and click on that link. Type in your Known Traveler Number and save it by clicking the Add number button.

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