Yes, you can add TSA PreCheck to a Delta ticket after you book, but the process depends on whether you already have a PreCheck number

If you have an active TSA PreCheck membership number, you can link it to your Delta reservation at any time — even years after you booked. Delta lets you add it through your online account, at the airport, or by calling reservations. If you don't have PreCheck yet, you'll need to enroll separately through the TSA's official enrollment program before Delta can attach it to your ticket.

The key difference is timing: adding an existing PreCheck number takes minutes and costs nothing. Getting PreCheck for the first time takes weeks and costs $78 to $85 for five years, depending on which enrollment center you use.

Key Takeaways

  • You can add your TSA PreCheck number to a Delta reservation after booking through Delta's website, mobile app, or by phone at no additional charge.
  • Your PreCheck number must already be active and valid with the TSA before Delta can attach it to your ticket.
  • If you don't have PreCheck yet, you must enroll through the TSA's official enrollment program, which costs $78 to $85 and takes two to four weeks.
  • Adding PreCheck to your ticket does not change your seat, fare, or any other part of your reservation.
  • You can add PreCheck to a Delta ticket up to the day of travel, though doing it earlier is safer in case of errors.

How to add an existing PreCheck number to your Delta reservation

Log into your Delta account on delta.com or the Delta app and find your reservation. Look for a section labeled "Manage My Booking" or "Trip Details." You'll see a field for "Known Traveler Number" or "KTN" — this is where your TSA PreCheck number goes. Enter your nine-digit PreCheck number exactly as it appears on your TSA card or enrollment confirmation.

If you prefer not to use the website, call Delta reservations at 1-800-221-1212 and give the agent your confirmation number and PreCheck number. They can add it in seconds. You can also add it at the airport ticket counter when you check in, though this is riskier because errors made at the counter are harder to fix before you reach security.

Once you've added your number, Delta will print it on your boarding pass. The TSA's security officers at the checkpoint will see it and direct you to the PreCheck lane, where you can keep shoes, belts, and light jackets on and leave laptops and liquids in your bag.

What happens if you don't have PreCheck yet

You cannot add PreCheck to your Delta ticket if you don't already have an active membership number. Delta has no way to enroll you — they can only attach a number you already have. To get PreCheck, you must go through the TSA's official enrollment program, which you can start at tsa.gov/precheck.

The enrollment process takes two to four weeks from start to finish. You'll pay the fee ($78 to $85 depending on your location), fill out an online form, and then visit an enrollment center in person for a brief appointment where they'll take your fingerprints and check your background. Once approved, the TSA will email you a Known Traveler Number, and that's the number you add to Delta.

If your flight is coming up soon, you won't have time to get PreCheck before you travel. In that case, you can still enroll now and use your new PreCheck number on future Delta flights.

When to add PreCheck to your ticket

Add your PreCheck number as soon as you have it, ideally when you first book or within a few days. The earlier you add it, the safer you are — it gives Delta time to process the change and print it correctly on your boarding pass. Adding it the day before or day of travel usually works fine, but errors are harder to catch and fix at that point.

If you're traveling within 24 hours and haven't added PreCheck yet, add it through the Delta app or website rather than calling, because phone lines can have longer wait times. Check your boarding pass after you add it to confirm your PreCheck number appears in the right place.

Your PreCheck number and multiple airlines

Your TSA PreCheck number works on every airline, not just Delta. Once you have the number, you can add it to reservations with United, American, Southwest, Alaska, JetBlue, and any other carrier. Each airline has its own field for your Known Traveler Number, so you'll need to add it separately to each reservation.

Some travelers add their PreCheck number to their airline profile (Delta calls this your "SkyMiles profile") so it automatically attaches to every new booking you make. Check your Delta account settings to see if this option is available — it saves you from having to add it manually each time.

What your PreCheck number does and doesn't do

Adding PreCheck to your Delta ticket gets you into the shorter security line at the checkpoint and lets you keep most of your clothes and electronics on. It does not change your seat, your fare, your boarding group, or anything else about your reservation. It's purely a security screening benefit.

PreCheck also does not may provide you'll go through a PreCheck lane every single time — the TSA can still direct you to a standard lane if they're short-staffed or if your flight is very busy. But on most days, especially at larger airports, you'll use the PreCheck lane if your number is on your boarding pass.

If you lose or forget your PreCheck number

Your TSA PreCheck number is printed on your TSA card and was also sent to you in an email when you were approved. If you can't find either, go to the TSA's official website at tsa.gov and use their "Find Your Known Traveler Number" tool. You'll need to answer security questions to retrieve it.

If you've lost your physical TSA card and need a replacement, you can order one through the TSA website for $20. A new card usually arrives in two to three weeks. In the meantime, you can still use your PreCheck number on airline reservations — the number itself never expires as long as your membership is active.

Frequently Asked Questions

Can I add PreCheck to a Delta ticket I booked years ago?

Yes. As long as your PreCheck membership is still active, you can add your number to any Delta reservation, even one from years ago. However, you can only add it before you travel — once the flight has departed, there's no reason to add it. If you're rebooking a cancelled flight, add your PreCheck number to the new reservation.

What if I add the wrong PreCheck number to my ticket?

Contact Delta right away through your online account or by calling 1-800-221-1212 and ask them to correct it. They can fix it quickly if you catch it before you travel. If you don't notice until you're at the airport, tell the ticket agent at check-in and they can update it, though this takes longer.

Do I have to add PreCheck to every Delta flight I book?

No. You can set up your Delta profile to automatically add your PreCheck number to every new reservation you make. Log into your Delta account, go to your profile settings, and look for the Known Traveler Number field. Enter it once and it will attach to future bookings automatically.

Will adding PreCheck cost me extra on my Delta ticket?

No. Adding your PreCheck number to a Delta reservation is free. You only pay for PreCheck once, when you enroll through the TSA, which costs $78 to $85 for five years. After that, using it on any airline is free.

Can I add PreCheck if I booked through a travel agent or third-party website?

Yes, but the process depends on where you booked. If you booked through a third-party site like Kayak or Expedia, log into your Delta account using your confirmation number and add PreCheck there. If you booked through a travel agent, call Delta directly with your confirmation number and they can add it for you.