Add Your TSA PreCheck Number to Delta in Three Steps

You can add your TSA PreCheck number directly in the Delta app so your Known Traveler Number (KTN) appears on your boarding pass automatically. This takes about two minutes and requires your TSA PreCheck membership number, which you received when you enrolled.

The process works the same whether you are on iPhone or Android. You will navigate to your profile settings, find the Known Traveler Number field, and enter your nine-digit TSA PreCheck number. Once saved, Delta will include it on every boarding pass you generate through the app going forward.

Key Takeaways

  • Your TSA PreCheck number is a nine-digit code that came with your membership card or enrollment confirmation email.
  • Adding your number in the Delta app means it will print on your boarding pass automatically, so you do not have to enter it at the airport.
  • You can add or update your TSA PreCheck number anytime through your profile settings in the Delta app.
  • The TSA PreCheck indicator on your boarding pass tells the airport security line that you are enrolled in the program.

Find Your TSA PreCheck Number Before You Start

Your TSA PreCheck number is a nine-digit code printed on your membership card. If you received a physical card in the mail, look at the front or back — the number is usually in the upper right corner or along the bottom edge. The format is typically all numbers with no letters.

If you cannot find your card, check your email for the enrollment confirmation message from TSA. This email was sent when your process was approved and contains your membership number. You can also log into your TSA account at tsa.gov using your username and password to view your number in the "My Enrollment" section.

Write down your nine-digit number before opening the Delta app. Having it ready means you will not need to search for it while you are in the middle of the process.

Open Delta App Settings and Navigate to Your Profile

Launch the Delta app on your phone and tap the menu icon — this is usually three horizontal lines in the upper left or right corner, depending on whether you are using iPhone or Android. Look for an option labeled "My Profile," "Account," or "Settings." Tap it to open your profile page.

You will see several sections on your profile, including your name, email address, and frequent flyer information. Scroll down until you find a field labeled "Known Traveler Number," "KTN," or "TSA PreCheck Number." This field may be empty or show a placeholder text like "Add your KTN."

Enter Your TSA PreCheck Number and Save

Tap the Known Traveler Number field to open the text box. Type your nine-digit TSA PreCheck number exactly as it appears on your card or enrollment email — no spaces, no dashes, just the nine digits. Double-check that you entered it correctly before moving forward, because a typo will prevent TSA PreCheck from showing on your boarding pass.

After you type your number, look for a "Save," "Update," or "Done" button. Tap it to confirm the change. The app will process your entry and return you to your profile page. You should see your TSA PreCheck number now displayed in the Known Traveler Number field.

Verify Your Number Appears on Your Next Boarding Pass

The easiest way to confirm your TSA PreCheck number was saved correctly is to check your next boarding pass. Open the Delta app, go to your upcoming reservations, and tap on a flight to view your boarding pass. Scroll down or look at the top of the boarding pass image — you should see "TSA PreCheck" or your KTN printed on it.

If your TSA PreCheck number does not appear on your boarding pass after you saved it, go back to your profile and verify that the number is still there. Sometimes the app requires you to close and reopen it before changes take effect. Close the Delta app completely, wait a few seconds, and open it again to refresh.

If the number still does not show after refreshing, check that you entered all nine digits correctly. A missing digit or typo will cause the system to reject it. Delete what you entered, re-type your number carefully, and save again.

What Happens When Your TSA PreCheck Number Is Linked

Once your TSA PreCheck number is saved in the Delta app, it will print on every boarding pass you create through the app. When you arrive at the airport, the TSA officer scanning your boarding pass will see that you are enrolled in TSA PreCheck and direct you to the PreCheck security line, which typically moves faster because you can leave shoes, belts, and light jackets on.

Your TSA PreCheck number stays linked to your Delta profile until you remove it or update it. If your TSA PreCheck membership expires or you renew it and receive a new number, you will need to update the number in the Delta app. You can do this anytime by following the same steps: open your profile, find the Known Traveler Number field, and enter the new number.

If you book a flight through a different airline or through a travel website instead of the Delta app, that boarding pass may not include your TSA PreCheck number unless you manually enter it during check-in. The Delta app link only affects boarding passes created through Delta's system.

Troubleshooting Common Issues

If you see an error message saying your TSA PreCheck number is invalid, the most common cause is a typo or an extra space. Delete the entry, take a moment to carefully re-type your nine-digit number, and try saving again. Make sure you are not including any dashes, spaces, or letters — only the nine digits.

If the Delta app will not let you save your number at all, try logging out of the app and logging back in. Sometimes a session error prevents changes from being saved. Close the app completely, wait 10 seconds, and reopen it. Log in with your Delta username and password, then try entering your TSA PreCheck number again.

If you are still having trouble, you can also add your TSA PreCheck number when you check in for a flight at the airport. At the check-in counter or kiosk, you will have the option to enter your Known Traveler Number. This will add it to that specific boarding pass, though it will not save it to your profile for future flights.

Frequently Asked Questions

Do I need TSA PreCheck to use the Delta app?

No. The Delta app works whether or not you have TSA PreCheck. Adding your TSA PreCheck number is optional and only affects what prints on your boarding pass. If you do not have TSA PreCheck, you can still use the app to book flights and check in normally.

What if I do not remember my TSA PreCheck number?

Log into your account at tsa.gov and click "My Enrollment" to view your membership number. You can also call the TSA at 1-855-347-8371, or check your original enrollment confirmation email. If you have your physical membership card, the number is printed on it.

Can I add my TSA PreCheck number to Delta through the website instead of the app?

Yes. Log into your Delta account on delta.com, go to your profile or account settings, and look for the Known Traveler Number field. The process is the same as in the app. Your number will then appear on boarding passes whether you check in through the app or the website.

Will my TSA PreCheck number work on flights with other airlines?

Your TSA PreCheck membership works at security with any airline, but you need to add your number to each airline's system separately. Adding it to Delta does not automatically add it to United, Southwest, or other carriers. You will need to enter your TSA PreCheck number in each airline's app or website.

What if my TSA PreCheck membership expires?

You can leave your expired number in the Delta app, but TSA will not recognize it at security. Before your membership expires, renew it through tsa.gov. Once you receive your new membership number, update it in the Delta app by following the same steps you used to add it the first time.