You can add TSA PreCheck to your Delta booking after check-in, but the timing matters

If you have a valid TSA PreCheck membership but didn't link it to your Delta reservation before checking in, you can still add it to your boarding pass. The process depends on when your flight departs. If your flight leaves within 24 hours, you'll need to do this at the airport counter or kiosk rather than online. If you have more than 24 hours before departure, you can add it through your Delta account online or on the Delta app, and the change will appear on your boarding pass within a few minutes.

The key is that Delta needs time to reissue your boarding pass with your Known Traveler Number (KTN) printed on it. At the airport, a Delta agent can do this when ready at the counter. Online, the system processes it automatically, but you should verify the update took effect before you head to the airport.

Key Takeaways

  • You can add TSA PreCheck to your Delta reservation after checking in if you have a valid membership number and your flight departs more than 24 hours away.
  • For flights within 24 hours, visit the Delta counter or kiosk at the airport and ask an agent to add your Known Traveler Number to your boarding pass.
  • For flights more than 24 hours away, log into your Delta account online or use the Delta app, go to your reservation, and add your TSA PreCheck number in the "Known Traveler Number" field.
  • After you add it online, refresh your boarding pass and confirm your TSA PreCheck membership number appears before you leave for the airport.
  • Your TSA PreCheck number is a nine-character code that begins with your membership program (TSA PreCheck numbers start with numbers or letters depending on when you enrolled).

Adding TSA PreCheck online if your flight is more than 24 hours away

Log into your Delta account on delta.com or open the Delta app. Find your upcoming reservation by searching for the flight or looking in your upcoming trips section. Click on the reservation to open the booking details.

Look for a section labeled "Passenger Details," "Traveler Information," or "Known Traveler Number." The exact wording varies depending on whether you're on the website or app, but it's always near your name and seat assignment. Click the edit or pencil icon next to your name. In the field for "Known Traveler Number" or "KTN," enter your nine-character TSA PreCheck membership number. This number was issued to you when you completed your TSA PreCheck enrollment and appears on your membership card or confirmation email.

Save the changes. Delta will update your reservation when ready, and your boarding pass will refresh within a few minutes to show your TSA PreCheck status. Before you leave for the airport, pull up your boarding pass again and confirm that your TSA PreCheck number now appears on it. If it doesn't show after 10 minutes, try refreshing the page or closing and reopening the app.

Adding TSA PreCheck at the airport counter or kiosk for flights within 24 hours

If your flight departs within 24 hours, the online system may not allow you to make changes to your reservation. Instead, go to the Delta counter or check-in kiosk at the airport before you go through security. Tell the agent or use the kiosk to access your reservation, and ask them to add your TSA PreCheck number to your boarding pass.

Have your TSA PreCheck membership number ready. The agent will enter it into your reservation and reissue your boarding pass on the spot. Your new boarding pass will print with your Known Traveler Number displayed, which tells TSA screeners that you're a PreCheck member. This process takes just a few minutes.

If you're using a kiosk, look for an option to "Modify Reservation" or "Update Passenger Information." Not all kiosks allow you to add a Known Traveler Number, so if the kiosk doesn't have that option, go to the counter instead.

What to do if your TSA PreCheck number doesn't appear on your boarding pass

After you add your number online, refresh your boarding pass at least twice to make sure the system has processed the change. Close the Delta app completely and reopen it, or clear your browser cache and reload the website. Sometimes the change takes a few minutes to sync across Delta's systems.

If your number still doesn't appear after 15 minutes, contact Delta customer service by phone or chat before you head to the airport. They can verify that your number was entered correctly and troubleshoot any system issues. You can also visit the Delta counter at the airport and ask an agent to check your reservation and reissue your boarding pass if needed.

Where to find your TSA PreCheck membership number

Your TSA PreCheck number is a nine-character code issued when you completed your enrollment. You can find it in several places: on your TSA PreCheck membership card (if you received a physical card), in your confirmation email from TSA, or in your TSA PreCheck account on the TSA website at tsa.gov.

If you don't have your number handy, log into your TSA PreCheck account at tsa.gov, click "View process Status," and your Known Traveler Number will be displayed. Write it down before you try to add it to Delta, so you have it ready.

Why Delta needs your TSA PreCheck number on your boarding pass

TSA PreCheck is a trusted traveler program that lets you go through expedited security screening at participating airports. For TSA screeners to know you're a member, your Known Traveler Number must be printed on your boarding pass. Without it on the pass, TSA has no way to know you're enrolled, and you'll go through standard security screening instead.

Delta doesn't automatically link your TSA PreCheck membership to your reservation unless you add it yourself during booking or update it afterward. That's why you need to enter your number manually, either before you check in or after if you forgot.

Frequently Asked Questions

Can I add TSA PreCheck to my boarding pass at the security checkpoint?

No. TSA screeners cannot add your number to your boarding pass at the checkpoint. You must add it to your Delta reservation before you reach security. If you're at the airport and haven't added it yet, go back to the Delta counter or kiosk before you get in the security line.

What if I have TSA PreCheck but Delta says my membership is invalid?

This usually means your membership has expired or your number was entered incorrectly. Check your TSA PreCheck account at tsa.gov to confirm your membership is still active. If it is, verify you entered the nine-character number exactly as it appears on your card or in your TSA account. If the problem persists, contact Delta customer service to have an agent manually review your account.

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

Yes, you need to add it to each reservation separately. However, if you save your Known Traveler Number in your Delta profile, the system may auto-fill it on future bookings. Check your Delta account settings to see if you can store your TSA PreCheck number there.

Will adding TSA PreCheck after check-in delay my flight?

No. Adding it online takes a few minutes and doesn't affect your flight. If you add it at the airport counter, it takes just a few minutes and won't delay your departure as long as you do it before you go through security.

What if my flight is international—do I still need TSA PreCheck on my boarding pass?

TSA PreCheck only applies to domestic flights within the United States. For international flights, your boarding pass doesn't need a Known Traveler Number, and TSA PreCheck won't help you at the security checkpoint. You'll go through standard screening regardless.