You can add TSA PreCheck to most reservations after booking, but the method depends on your airline

Yes, you can add your TSA PreCheck Known Traveler Number (KTN) to a reservation you already made. You do not need to rebook or cancel. Most airlines let you add it through their website, mobile app, or by calling their reservation line. The process takes a few minutes and costs nothing — you pay for TSA PreCheck itself when you enroll, not when you add it to a ticket.

The exact steps vary by airline. Some airlines let you edit your reservation online and add the number yourself. Others require a phone call. A few regional carriers have slower systems and may need you to contact them directly. The sooner you add it, the sooner it appears in the TSA system and the sooner you can use TSA PreCheck lanes at security.

Key Takeaways

  • You can add your TSA PreCheck KTN to an existing reservation through your airline's website, app, or by phone — no rebooking required.
  • The KTN is a nine-character number you receive when TSA approves your PreCheck process, usually within three to five business days of your appointment.
  • Adding the number before you check in is best, but you can add it at the airport if needed — just arrive early to give TSA time to update their system.
  • If your airline's system will not accept the number, contact the airline's customer service to confirm your KTN is correct and ask them to add it manually.

Where to find your TSA PreCheck Known Traveler Number

Your KTN appears in your TSA PreCheck approval email and in your account on the TSA's official website, trusted.tsa.gov. Log in with your username and password to view your approval letter, which displays the nine-character number. Write it down or take a screenshot before you try to add it to your airline reservation.

If you cannot find your approval email or do not remember your login, go to trusted.tsa.gov and click "Forgot Username" or "Forgot Password" to recover your account. If you have not received an approval email at all and your appointment was more than five business days ago, contact the TSA PreCheck help desk at 855-347-8371 to check your process status.

Adding your number through the airline website or app

Most major airlines — including American, Delta, United, Southwest, and JetBlue — let you add your KTN online. Log into your airline account, find the reservation, and look for an option to edit passenger details or add frequent flyer and security information. The field is usually labeled "Known Traveler Number," "KTN," or "TSA PreCheck Number." Paste or type your nine-character number exactly as it appears on your approval letter, with no spaces or dashes.

After you save the change, the airline sends the number to the TSA system, which usually takes a few minutes to a few hours. You can check your reservation again to confirm the number was saved. If the website rejects the number and says it is invalid, double-check that you copied it correctly — a single wrong character will cause the system to reject it.

Adding your number by phone or at the airport

If you cannot add the number online, call your airline's reservation line and ask a representative to add your TSA PreCheck KTN to your booking. Have your confirmation number and KTN ready. The representative will update your reservation in their system and confirm the change before you hang up.

You can also add your KTN at the airport when you check in, either at the ticket counter or at a kiosk. Tell the agent you have TSA PreCheck and provide your KTN. They will add it to your reservation in the airline system. However, arriving early is important — the TSA system needs time to receive the update before you reach security, so check in as soon as you arrive at the airport.

What happens after you add your number

Once your airline submits your KTN to the TSA system, the TSA's database updates to show you are PreCheck-approved for that flight. At security, the TSA officer scans your boarding pass and sees the PreCheck indicator. You then proceed to the TSA PreCheck lane, where you can keep your shoes, belt, and light jacket on, leave your laptop and liquids in your bag, and move through security faster.

The update usually happens within hours of you adding the number, but it can take up to 24 hours in rare cases. If you are flying the same day you add your number, arrive at the airport extra early. If the TSA PreCheck lane is not available when you reach security, ask the officer to manually verify your PreCheck status using your KTN — they can look it up in their system.

Troubleshooting: Your airline will not accept the number

If your airline's website or app rejects your KTN, first verify you copied it correctly from your approval email or trusted.tsa.gov. The number is nine characters long and may include letters and numbers. Do not add spaces, dashes, or extra characters.

If the number is correct and the system still rejects it, call your airline's customer service line and ask them to manually add the KTN to your reservation. Explain that you have an active TSA PreCheck approval and provide your KTN. The representative can enter it directly into their system. If the airline says the number is invalid, contact the TSA PreCheck help desk at 855-347-8371 to confirm your approval is active and your KTN is correct.

Adding your number to multiple reservations

If you have booked several flights, you will need to add your KTN to each reservation separately. You can do this all at once by logging into your airline account and editing each booking, or you can add it to each flight as you check in. There is no limit to how many reservations you can add it to, and you do not pay anything extra.

If you book frequently with the same airline, consider linking your TSA PreCheck to your frequent flyer account. Some airlines automatically add your KTN to all future bookings once you link your PreCheck approval to your profile. Log into your frequent flyer account and look for a security or PreCheck settings section to set this up.

Frequently Asked Questions

Do I have to add my TSA PreCheck number before I fly?

No, but you should. If you do not add it before you reach security, you will go through standard screening instead of the faster PreCheck lane. You can add it at the airport when you check in, but arriving early is important so the TSA system has time to update.

What if I add my number but the TSA PreCheck lane is not available at my airport?

Some smaller airports do not have TSA PreCheck lanes. Ask the TSA officer at security to manually verify your PreCheck status using your KTN. They can confirm you are approved and may be able to expedite your screening, though you will go through the standard line if no PreCheck lane exists.

Can I add my TSA PreCheck number to someone else's reservation?

No. Each traveler must add their own KTN to their own reservation. If you are booking for a family member or colleague, they will need to add their own PreCheck number to their ticket after you complete the booking.

What if my TSA PreCheck approval expires before my flight?

TSA PreCheck is valid for five years from your approval date. If your approval expires before your flight, you will not be may be able to access for PreCheck screening on that flight. You can renew your approval up to six months before it expires by scheduling a new appointment at a TSA PreCheck enrollment center.

Does adding my number to my reservation cost anything?

No. Adding your KTN to a reservation is free. You pay for TSA PreCheck itself during your enrollment appointment, which costs $78 to $85 depending on your location and whether you use a discount code. Adding the number to your ticket has no additional charge.