Where to find your TSA PreCheck number online

Your TSA PreCheck number is in your account on the official TSA website. Go to tsa.gov, click "Manage Trusted Traveler Program" in the top navigation, and sign in with the same username and password you used when you enrolled. Your Known Traveler Number (KTN)—that's the official name for your TSA PreCheck number—appears on your account dashboard under "Active Memberships" or "Program Details."

If you do not remember your login credentials, click "Forgot Username" or "Forgot Password" on the sign-in page. You will need the email address or phone number you registered with. TSA will send you a reset link, usually within a few minutes.

The number itself is nine digits long and always starts with your initials or a code assigned to you during enrollment. Write it down or take a screenshot—you will need it every time you book a flight.

Key Takeaways

  • Your TSA PreCheck number is stored in your account at tsa.gov under "Manage Trusted Traveler Program."
  • You will need the email address or phone number you used during enrollment to sign in or reset your password.
  • Your number is nine digits long and should be entered in the "Known Traveler Number" field when you book flights.
  • If you cannot find your number online, you can call the TSA at 1-855-347-8371 to request it by phone.

What to do if you cannot access your account

If you have tried to reset your password and still cannot log in, the TSA customer service line can look up your number for you. Call 1-855-347-8371 between 8 a.m. and 10 p.m. Eastern time, Monday through Friday. Have your driver's license number and date of birth ready—the agent will verify your identity before giving you your number.

Wait times can be long during peak travel seasons (early morning, late afternoon, and the week before major holidays). If you reach a busy signal, try calling back in 15 minutes or use the callback feature if available.

Where to enter your number when booking

When you book a flight on an airline website or through a travel booking site, look for a field labeled "Known Traveler Number," "KTN," or "TSA PreCheck Number." This field is usually on the same page where you enter your name and date of birth. Some airlines put it under "Special Services" or "Frequent Flyer Information."

Entering your number at booking is the only way the TSA can match you to your PreCheck status at the airport. If you forget to add it during booking, contact the airline before your flight—most will add it to your reservation at no charge.

How to check your membership status and expiration date

Your TSA PreCheck membership is valid for five years from the date you were approved. On the same account dashboard where you found your number, you will see your membership expiration date. If your membership is within six months of expiring, you can renew it through the same tsa.gov account.

If your membership has already expired, you will need to enroll again in person at a TSA enrollment center or through a partner program like Global Entry. Your old number will no longer work at airport security.

What happens if you lose or forget your number

Losing your TSA PreCheck number is not an emergency. You can always look it up again at tsa.gov or call the TSA customer service line. If you are at the airport and realize you did not enter your number when booking, tell the TSA officer at security—they can look it up using your name and date of birth, though this may slow down your screening slightly.

For future flights, save your number in your phone or email it to yourself so you have it ready when you book. Many travelers also store it in their airline loyalty account, which auto-fills the field on future bookings.

Protecting your TSA PreCheck number

Your TSA PreCheck number is not sensitive like a Social Security number, but you should still treat it as personal information. Do not share it on public Wi-Fi networks or unsecured websites. When you log into tsa.gov, make sure the web address starts with "https://" (the "s" means it is encrypted).

If you suspect someone has misused your number or your account has been compromised, call the TSA at 1-855-347-8371 to report it. The TSA can flag your account and issue you a new number if needed.

Frequently Asked Questions

Can I use someone else's TSA PreCheck number?

No. Your TSA PreCheck number is tied to your identity and can only be used by you. If someone else tries to use your number, the TSA will catch the mismatch at security. Each person in your family or group needs their own TSA PreCheck membership and number.

What if my TSA PreCheck number is not working at the airport?

Tell the TSA officer at security that you have an active membership. They can verify your status in their system using your name and date of birth. This usually takes a minute or two. If there is a persistent problem, ask to speak to a supervisor—they can investigate whether your account was deactivated or if there is a system error.

Do I need my TSA PreCheck number to go through security?

No, but you will go through standard security screening instead of the faster PreCheck lane. Having your number entered at booking ensures you get the PreCheck benefits—shorter lines, keeping shoes and belt on, and laptops staying in your bag. Without it, you will be screened like any other passenger.

Can I look up someone else's TSA PreCheck number?

No. The TSA will only release your number to you or to someone with legal authority over your account. You cannot look up a family member's or friend's number—they have to do it themselves through their own tsa.gov account.