Add your TSA PreCheck number in the Delta app under your profile settings

To add TSA PreCheck to your Delta app, open the app and tap the menu icon (three horizontal lines), then select "My Profile" or "Account Settings." Look for a section labeled "Known Traveler Number" or "TSA PreCheck." Enter your TSA PreCheck number — a nine-digit code that starts with your initials — and save. The number will then appear on your mobile boarding pass when you check in for a Delta flight.

Your TSA PreCheck number comes from your approval letter or your TSA account at tsa.gov. If you do not have it handy, you can log into your TSA account to retrieve it. Once you add it to Delta, the airline will pass it to TSA at the airport, and TSA will use it to identify you as a PreCheck member when you arrive at security.

The process takes less than a minute. You only need to do it once per app — Delta will keep the number on file for all future bookings on that device.

Key Takeaways

  • Your TSA PreCheck number is a nine-digit code that appears on your TSA approval letter or in your account at tsa.gov.
  • In the Delta app, navigate to your profile or account settings and find the "Known Traveler Number" field to enter your number.
  • Once saved, your TSA PreCheck number will show on your mobile boarding pass and alert TSA at security that you are a PreCheck member.
  • You only need to add your number once; Delta stores it for all future bookings on that device.
  • If you cannot find your number, log into your TSA account at tsa.gov to retrieve it.

Where to find your TSA PreCheck number

Your TSA PreCheck number appears in two places. First, check the approval letter you received by mail when TSA approved your process — the number is printed clearly on that letter. If you no longer have the letter, log into your TSA account at tsa.gov, click "View My process Status," and your number will be listed there.

The number is always nine digits long and typically begins with your initials. Do not confuse it with your Known Traveler Number (KTN) from other programs like Global Entry or NEXUS — those are different codes, though if you hold Global Entry, your TSA PreCheck number is included in that membership.

Step-by-step: adding the number in the Delta app

Open the Delta app and tap the menu icon in the bottom right corner (three horizontal lines). Select "My Profile" or "Account Settings" — the exact wording depends on your app version, but it will be near the top of the menu.

Scroll down until you see a field for "Known Traveler Number," "TSA PreCheck," or "TSA Number." Tap that field and enter your nine-digit TSA PreCheck number. Double-check that you have typed it correctly — a single wrong digit will prevent TSA from recognizing you at the airport. Tap "Save" or "Done."

The number is now linked to your Delta account. When you check in for a flight through the app, your mobile boarding pass will display your TSA PreCheck status, and Delta will send that information to TSA before you arrive at the airport.

What happens after you add your number

Once your TSA PreCheck number is in the Delta app, it will appear on every mobile boarding pass you generate for a Delta flight. At the airport, TSA will scan your boarding pass and see that you are a PreCheck member. This tells them to direct you to the TSA PreCheck security line, where you can keep your shoes, belt, and light jacket on, and leave your laptop and liquids in your bag.

The number stays in your app indefinitely unless you delete it or remove it from your profile. If you fly on other airlines, you will need to add your TSA PreCheck number to their apps as well — each airline maintains its own system.

Troubleshooting: your number does not appear on your boarding pass

If you added your TSA PreCheck number but it is not showing on your mobile boarding pass, first confirm that you entered the number correctly. Go back to your profile settings and verify every digit. A common mistake is typing the letter O instead of the number 0, or vice versa.

If the number is correct, try deleting it from your profile and re-entering it. Close the Delta app completely and reopen it, then check in for your flight again. If the number still does not appear, contact Delta customer service before you go to the airport — they can confirm whether the number is linked to your reservation.

It is also possible that your TSA PreCheck membership has expired. TSA PreCheck is valid for five years from your approval date. Check your approval letter or your TSA account to confirm your membership is still active. If it has expired, you will need to renew it through TSA before the number will work at the airport.

Adding TSA PreCheck to other airlines

Each airline has its own app and its own process for storing your TSA PreCheck number. If you fly on American, United, Southwest, or other carriers, you will need to add your number to their apps separately. The process is similar — find your profile or account settings, look for a "Known Traveler Number" field, and enter your TSA PreCheck number.

You can also add your TSA PreCheck number when you book a flight on an airline's website. During checkout, there is usually a field for "Known Traveler Number" or "TSA PreCheck." Entering it at booking time means it will be on your reservation from the start, and you will not have to add it later.

Frequently Asked Questions

What if I do not have my TSA PreCheck number?

Log into your TSA account at tsa.gov and click "View My process Status." Your nine-digit number will be displayed there. If you cannot find it online, call the TSA at 1-855-347-8371 and they can provide it over the phone.

Can I add TSA PreCheck to the Delta app on my computer?

You can add it through Delta's website by logging into your account and going to your profile settings, but the mobile boarding pass feature works only on the Delta app. For the best experience, add your number in the app on your phone.

Do I need to add my TSA PreCheck number every time I book a flight?

No. Once you add it to your Delta profile, it stays there. It will appear on every boarding pass you generate through the app, for every flight you book.

What if my TSA PreCheck membership expires?

Your TSA PreCheck is valid for five years. When it expires, you will need to renew it through TSA before the number will work at airport security. You can renew online at tsa.gov or at an enrollment center.

Will my TSA PreCheck number work at the airport if I print my boarding pass instead of using the app?

Yes, as long as you added your number to your Delta reservation when you booked the flight or checked in online. The number will print on your paper boarding pass just as it appears on the mobile version.