Where to find your TSA PreCheck number online

Your TSA PreCheck number is in your account on the TSA's official website. Go to tsa.gov, click "Manage Enrollment," and sign in with the same username and password you created when you enrolled. Your Known Traveler Number (KTN)—that's the official name for your TSA PreCheck number—will appear on your account dashboard. It's a 10-digit code that starts with your initials or a number.

If you don't remember your login details, use the "Forgot Username" or "Forgot Password" link on the Manage Enrollment page. You'll need to verify your identity using your Social Security number and date of birth. The system will send a reset link to the email address on file.

This online method is the fastest way to retrieve your number if you need it right away for a flight or to add it to a reservation. The entire process takes just a few minutes once you're logged in.

Key Takeaways

  • Your TSA PreCheck number is a 10-digit Known Traveler Number (KTN) stored in your account at tsa.gov under Manage Enrollment.
  • You can retrieve it by signing in with your enrollment username and password, or by resetting your login if you've forgotten it.
  • Your approval notice email from TSA also contains your number, so check your email inbox or spam folder if you still have that message.
  • If you cannot locate your number through either method, you can call the TSA PreCheck customer service line at 1-855-347-8371 to confirm it.

Check your approval notice email

When TSA approved your PreCheck enrollment, they sent you a confirmation email with your Known Traveler Number included in the message. Search your email inbox for messages from "tsa@tsa.dhs.gov" or look for subject lines containing "TSA PreCheck" or "enrollment confirmation." Check your spam and promotions folders too—the email sometimes lands there by mistake.

The approval notice is a PDF attachment or text in the email body. Your 10-digit number will be clearly labeled as your "Known Traveler Number" or "KTN." Save this email or print it for your records, since you may need to reference the number later when updating reservations or troubleshooting screening issues.

Call TSA PreCheck customer service

If you cannot find your number online or in your email, call the TSA PreCheck customer service line at 1-855-347-8371. The line is open Monday through Friday, 8 a.m. to 10 p.m. Eastern time, and Saturday and Sunday, 9 a.m. to 8 p.m. Eastern time. Have your driver's license or passport ready when you call.

A representative will verify your identity and provide your Known Traveler Number over the phone. They can also confirm whether your enrollment is still active and answer questions about your account status. Wait times vary depending on how busy the line is, so calling early in the morning or mid-week may be faster.

Add your number to airline reservations

Once you have your TSA PreCheck number, add it to your airline reservation so TSA can identify you at security. When you book a flight online, there is usually a field labeled "Known Traveler Number," "KTN," or "Frequent Flyer Information" where you enter the 10-digit code. Some airlines call it "Redress Number" or "TSA PreCheck ID"—use the same number in whichever field your airline provides.

If you've already booked a flight without adding your number, you can edit your reservation on the airline's website or app and add it before you check in. Adding it after check-in may not work, so do this as soon as you have the number. The airline will pass the information to TSA before your flight, which allows TSA to match you to your PreCheck benefits at the security checkpoint.

What to do if your enrollment has expired

TSA PreCheck approval lasts for five years from your enrollment date. If your five years are up, your Known Traveler Number is no longer active, and you will not receive PreCheck benefits at security even if you use the number. You can check your expiration date in your Manage Enrollment account on tsa.gov by looking at the account details section.

If your enrollment has expired, you will need to renew it by submitting a new process and paying the renewal fee. The renewal process is the same as the initial enrollment. Until you renew, your old number cannot be used for PreCheck screening, and you'll go through standard security lines instead.

Frequently Asked Questions

Can I use my TSA PreCheck number if I'm traveling internationally?

Your TSA PreCheck number only works for domestic U.S. flights and applies to security screening at U.S. airports. For international travel, you may be able to use other trusted traveler programs like Global Entry (which includes TSA PreCheck benefits) if you have enrolled in that program, but the number itself is for domestic use only.

What if I lost my approval notice and can't access my email?

Call TSA PreCheck customer service at 1-855-347-8371 with your driver's license or passport information ready. They can look up your account and provide your Known Traveler Number. You don't need the physical approval notice to use your PreCheck benefits—the number in the system is what matters.

Is my TSA PreCheck number the same as my frequent flyer number?

No. Your Known Traveler Number is separate from any frequent flyer or loyalty program number. You enter both when you book a flight—the KTN goes in the TSA PreCheck field, and your frequent flyer number goes in the airline loyalty field. They are different codes that serve different purposes.

Can someone else use my TSA PreCheck number?

No. Your Known Traveler Number is tied to your identity and can only be used when you travel. TSA matches the number to your name and ID at security. If someone else tries to use your number, it will not work for them, and they may face delays or additional screening.

What should I do if my TSA PreCheck number isn't working at the airport?

First, confirm that you added the number to your airline reservation before you checked in. If it's there and you're still not getting PreCheck screening, check that your enrollment hasn't expired by logging into Manage Enrollment at tsa.gov. If everything looks correct, speak to a TSA officer at the checkpoint—they can manually verify your status or direct you to the PreCheck lane.