Link your TSA PreCheck to Delta in three steps

Open the Delta app on your phone or go to delta.com on a browser. Sign into your SkyMiles account. Go to your profile or account settings — on the app, tap the menu icon (three horizontal lines) in the bottom right, then select "Profile." On the website, click your name in the top right corner and choose "Profile."

Look for a section called "Known Traveler Number" or "KTN" in your profile settings. This is where you enter your TSA PreCheck number. Paste or type your nine-digit TSA PreCheck number into that field. Save the changes.

Once saved, your TSA PreCheck number will appear on your boarding pass when you check in for a Delta flight. The TSA agent at security will see it and direct you to the PreCheck lane, where you can keep shoes, belts, and light jackets on and leave your laptop in your bag.

Key Takeaways

  • Your TSA PreCheck number goes in the "Known Traveler Number" field in your Delta profile, not in a separate TSA section of the app.
  • The number must be entered exactly as it appears on your TSA PreCheck card — a nine-digit code starting with your initials.
  • After you save it, the number shows on every boarding pass you generate through Delta, whether you check in online, on the app, or at the airport.
  • If you do not see the KTN field in your profile, make sure you are signed into your SkyMiles account before looking for it.

Where to find your TSA PreCheck number

Your TSA PreCheck number is printed on the back of your physical TSA PreCheck card in the bottom right corner. It is a nine-digit code that usually starts with your first and last initials. If you have the card in front of you, that is the fastest way to get the number.

If you cannot find your card, you can look up your TSA PreCheck number on the TSA website. Go to tsa.gov, click "Check process Status," and sign in with your credentials. Your Known Traveler Number will appear on the status page. You can also call the TSA at 1-855-347-8371 to confirm your number over the phone.

What happens after you add it to Delta

Once your TSA PreCheck number is saved in your Delta profile, it automatically transfers to your boarding pass. You do not need to do anything else for each flight — the number stays linked to your SkyMiles account and appears on every boarding pass you print or display on your phone.

At the airport, show your boarding pass (with the TSA PreCheck number visible) and your ID to the TSA agent. They will scan your boarding pass and see the PreCheck indicator. You will then be directed to the TSA PreCheck security line, which is usually shorter and has fewer restrictions on what you can carry through security.

Fixing a number that will not save

If you enter your TSA PreCheck number but it does not save, first check that you are using the exact nine-digit code from your card. Even a single wrong digit will cause the system to reject it. Delete what you typed and re-enter it carefully, character by character.

If the number still will not save, try a different browser or clear your app cache and log out, then log back in. On the Delta app, go to Settings (the gear icon), scroll down, and tap "Clear Cache." On a browser, try a different one — Chrome, Safari, or Firefox — to see if the issue is specific to your current browser.

If the problem persists, contact Delta customer service at 1-800-221-1212 or through the app's chat feature. They can manually verify your TSA PreCheck number in their system and add it to your account if the self-service option is not working.

Adding TSA PreCheck to other airlines

Every major airline has a similar field for your Known Traveler Number. United, American, Southwest, and others all ask for it in their frequent flyer profiles. The process is the same: log in, find the KTN or TSA PreCheck field, enter your nine-digit number, and save.

You only have one TSA PreCheck number, so you can add it to as many airline accounts as you want. There is no limit, and adding it to multiple airlines does not affect your PreCheck status or cost anything extra. It straightforward makes sure the number appears on your boarding pass no matter which airline you fly.

When your TSA PreCheck number does not show on your boarding pass

If you saved your number to your Delta profile but it is not appearing on your boarding pass, the most common reason is that you checked in before the system updated. Try checking in again — delete the boarding pass from your phone and generate a new one through the app or website. The number should appear on the new pass.

Another possibility is that you checked in at a kiosk or counter at the airport before your profile was fully synced. This can take a few hours after you first save it. If you are checking in more than a few hours after adding your number, it should be there. If it is still missing, show your TSA PreCheck card to the agent at the gate — they can manually note it in the system.

Frequently Asked Questions

Do I need to add my TSA PreCheck number to Delta if I already have TSA PreCheck?

Yes. Having TSA PreCheck does not automatically link it to your airline accounts. You must enter your number in each airline's profile for it to appear on your boarding pass. Without the number on your pass, the TSA agent will not know you have PreCheck and will not direct you to the PreCheck line.

What if I have Global Entry instead of TSA PreCheck?

Global Entry includes TSA PreCheck benefits. Your Known Traveler Number is the same one you use for Global Entry. Enter it in the Delta KTN field exactly as it appears on your Global Entry card, and you will get PreCheck screening on domestic flights.

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

Yes. Go to delta.com, sign in to your SkyMiles account, click your name in the top right, select "Profile," find the Known Traveler Number field, and enter your nine-digit code. The process is the same on both the app and website, and the number syncs across both.

Will adding my TSA PreCheck number to Delta cost me anything?

No. Linking your existing TSA PreCheck number to your Delta account is free. You already paid for TSA PreCheck when you applied for it — adding it to airline profiles does not cost extra and does not renew or extend your PreCheck status.

What if I renew my TSA PreCheck and get a new number?

When you renew TSA PreCheck, you will receive a new card with a new nine-digit number. Go back into your Delta profile, delete the old number from the KTN field, and enter the new one. Save it, and the new number will appear on your next boarding pass.