Where to Find Your TSA PreCheck Number Online

Your TSA PreCheck number is in your email confirmation from TSA, on the official TSA website using your login, or in the TSA mobile app. The fastest way is to check the confirmation email you received when your process was approved — it contains your 10-digit Known Traveler Number (KTN), which is your TSA PreCheck number.

If you cannot find that email, log into your account at tsa.gov using the same username and password you created during your process. Once logged in, your dashboard will display your KTN prominently. You can also read the TSA PreCheck mobile app (available on iOS and Android), which shows your number in the app's main screen after you sign in.

Write down your number or take a screenshot — you will need it when you book flights and check in at the airport. Airlines ask for your KTN during online check-in, and the TSA uses it to match you against their database at security.

Key Takeaways

  • Your TSA PreCheck number is a 10-digit Known Traveler Number (KTN) sent to you by email when your process was approved.
  • You can retrieve your number by logging into tsa.gov with your process username and password, or by opening the TSA mobile app.
  • Enter your KTN when you book flights online so the airline knows you are a PreCheck member at check-in.
  • If you cannot find your number anywhere, contact the TSA directly through their website or call the PreCheck customer service line for help locating it.

Checking Your Number Through Your Airline Account

Many airlines store your TSA PreCheck number in your frequent flyer or airline account. Log into your airline's website or app, go to your profile or account settings, and look for a section labeled "Known Traveler Number," "TSA PreCheck," or "Travel Documents." If you have already entered your KTN there during a previous booking, it will be saved and you can view it anytime.

This method is useful if you remember which airline you flew with most recently but cannot access your TSA account. However, the airline only shows the number you gave them — it does not retrieve it from TSA's system. If the number in your airline account looks wrong or incomplete, go back to tsa.gov to confirm the correct one.

What to Do If You Cannot Locate Your Number

If you have searched your email, checked tsa.gov, and looked in the TSA app without finding your number, contact TSA directly. Visit tsa.gov/contact to find the phone number for TSA PreCheck customer service, or use the "Contact Us" form on the website. Have your full name, date of birth, and the email address you used for your process ready when you call.

TSA can confirm whether your process was approved and resend your KTN to your email on file. Processing this request usually takes a few business days. If your process was never approved, TSA will tell you what happened and whether you can reapply.

Understanding Your TSA PreCheck Number Format

Your Known Traveler Number is always 10 digits long and appears as a string of numbers with no letters or special characters. It looks like this: 1234567890. Some people confuse it with their process receipt number (which is different) or their confirmation code — make sure you are using the actual KTN, which TSA specifically labels as your "Known Traveler Number" in emails and on the website.

When you enter your number during airline check-in, the system matches it against TSA's PreCheck database. If the number is wrong or incomplete, the airline will not know you are a PreCheck member, and you will go through standard security screening instead of the faster PreCheck lane.

Entering Your Number When You Book a Flight

During online check-in on your airline's website or app, you will see a field for "Known Traveler Number" or "TSA PreCheck Number." Enter your 10-digit KTN exactly as it appears in your TSA confirmation. Some airlines ask for this information during the initial booking; others ask during check-in 24 hours before your flight.

If you forget to enter it at booking, you can usually add it during check-in or even at the airport ticket counter before you go through security. However, entering it online ahead of time ensures the airline has it in their system and can print it on your boarding pass, which makes the TSA's job easier at the checkpoint.

Keeping Your Number Safe and Accessible

Store your TSA PreCheck number in a safe place you can access quickly — your phone's notes app, a password manager, or a photo of your confirmation email. You do not need to memorize it, but having it readily available saves time when you book flights or check in at the airport.

Do not share your KTN with anyone except the airline or TSA. It is not a secret like a password, but it is personal information tied to your identity and travel history. If you lose your PreCheck membership or it expires, you will need to renew it through TSA, and you will receive a new number.

Frequently Asked Questions

Is my TSA PreCheck number the same as my confirmation number?

No. Your confirmation number is a temporary code TSA sends when you submit your process. Your Known Traveler Number (KTN) is the permanent 10-digit number you receive when your process is approved. You need the KTN for flights, not the confirmation number.

What if my TSA PreCheck number is not showing up on my boarding pass?

The airline may not have received your number, or you may have entered it incorrectly during check-in. Log back into your airline account, verify the number you entered matches your TSA confirmation exactly, and update it if needed. Contact the airline's customer service if the number still does not appear on your next boarding pass.

Can I use my TSA PreCheck number for international flights?

TSA PreCheck applies to domestic U.S. flights only. For international travel, you may be interested in Global Entry, which includes TSA PreCheck benefits and covers international airports. These are separate programs with different numbers, though you can hold both.

How long is my TSA PreCheck number valid?

Your TSA PreCheck membership lasts five years from the date you were approved. Your KTN remains the same throughout those five years. When your membership is about to expire, TSA will send you a renewal notice, and you will receive a new number once you renew.

What should I do if I think someone else has my TSA PreCheck number?

Contact TSA when ready through tsa.gov/contact. While your KTN is not as sensitive as a Social Security number, reporting it protects your account. TSA can flag your account and monitor for unauthorized use, and they can issue you a new number if necessary.