Your TSA PreCheck number is in your email confirmation, on your Known Traveler Number (KTN) card, or in your TSA account online

When you completed your TSA PreCheck appointment and paid the fee, you received a confirmation email with your nine-digit number. That email is the fastest place to look first. If you cannot find it, log into your TSA account at universalEnroll.dhs.gov — the same website where you originally registered — and your number will appear in your account dashboard. You can also check the physical card that arrived in the mail, which displays your KTN prominently on the front.

Your TSA PreCheck number and your Known Traveler Number are the same thing. Airlines and the TSA use both names interchangeably. When you book a flight, you enter this number in the "Known Traveler Number" field so the TSA knows to screen you through the PreCheck lane at airport security.

Key Takeaways

  • Your TSA PreCheck number is a nine-digit code sent to you by email after your appointment and printed on your physical KTN card.
  • Log into your TSA account at universalEnroll.dhs.gov to view your number anytime without searching for old emails.
  • Enter your number when booking flights in the Known Traveler Number field so airlines can flag your reservation for PreCheck screening.
  • If your card is lost or damaged, you can request a replacement through your TSA account or contact the TSA directly.

Check your TSA account online first

Go to universalEnroll.dhs.gov and sign in with the same username and password you created during your PreCheck enrollment. Once logged in, your dashboard will display your Known Traveler Number in large text. This is the most reliable method because your account is permanent — you do not need to dig through email folders or wait for mail.

If you forgot your password, click "Forgot Password" on the login page and follow the reset steps sent to your email address. The reset link expires after a few hours, so complete it promptly. Once you are back in your account, your KTN will be visible when ready.

Look in your confirmation email from TSA

Search your email inbox for messages from "tsa@dhs.gov" or "TSA PreCheck" with a subject line like "TSA PreCheck Enrollment Confirmation" or "Your Known Traveler Number." The email typically arrives within a few days of your appointment. Your nine-digit number appears in the body of the email, often near the top.

If you deleted the email, check your trash or spam folder — confirmation emails sometimes land there by mistake. You can also search your email using keywords like "KTN" or "Known Traveler" to narrow the results. Once you find it, save or screenshot the email for future reference.

Find the number on your physical KTN card

The TSA mails a physical card to the address you provided during enrollment. The card arrives in a white envelope and displays your Known Traveler Number prominently on the front, usually in the upper right corner. The number is printed in large digits and is straightforward to read.

Keep this card in your wallet or travel documents. You do not have to show it at security — the TSA checks your number in the airline system — but having it on hand makes it straightforward to reference when booking flights or if you need to provide proof of your PreCheck status to an airline agent.

What to do if your card is lost or damaged

Log into your TSA account at universalEnroll.dhs.gov and look for a "Replace Card" or "Reissue Card" option in your account settings. Follow the prompts to request a replacement. The TSA will mail a new card to your address at no extra cost. The process typically takes two to three weeks.

If you cannot access your account or prefer to request a replacement by phone, contact the TSA at 1-855-347-8371. Have your name, date of birth, and the address on file ready. You will need to verify your identity before the TSA processes the request. Your original nine-digit number does not change — the new card will display the same KTN.

Enter your number correctly when booking flights

When you purchase a ticket online or through a travel agent, look for a field labeled "Known Traveler Number," "KTN," or "Frequent Traveler Information." Enter your nine-digit TSA PreCheck number exactly as it appears on your card or in your account. Do not add spaces or dashes — type only the digits.

Some airlines place this field on the main booking page; others hide it under "Passenger Details" or "Special Services." If you cannot find it during online booking, call the airline directly and provide your KTN before your flight. The airline can add it to your reservation even after you book, though doing it at purchase time is simpler.

Frequently Asked Questions

What if I never received my KTN card in the mail?

Check your TSA account online first — your number is active even if the card has not arrived. If more than four weeks have passed since your appointment, log in and request a replacement card. You can also call the TSA at 1-855-347-8371 to confirm your address and request reissuance.

Can I use my TSA PreCheck number if I do not have the physical card?

Yes. The card is a convenience, not a requirement. Your number is linked to your name in the TSA system, so entering it when you book a flight is all you need. The TSA checks the airline reservation, not the card itself.

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

No. Your Known Traveler Number is issued by the TSA and is separate from any airline loyalty program number. You enter both when booking — the KTN in the "Known Traveler Number" field and your frequent flyer number in the airline's loyalty section.

What if I entered my KTN wrong when booking my flight?

Contact your airline before your flight and ask them to correct the Known Traveler Number in your reservation. Most airlines can update it without rebooking you. If you catch it at the airport, tell the TSA officer at security that your number was entered incorrectly — they can look up your PreCheck status by name and date of birth.

How long is my TSA PreCheck number valid?

Your Known Traveler Number is valid for five years from the date of your appointment. The TSA will send you a renewal notice by email about 90 days before expiration. You can renew online through your account or schedule a new in-person appointment.