What’s a Known Traveler Number (KTN)?

5 Min Read | Last updated: September 18, 2025

Woman is holding her luggage through TSA machine

This article contains general information and is not intended to provide information that is specific to American Express products and services. Similar products and services offered by different companies will have different features and you should always read about product details before acquiring any financial product.

Learn how you can obtain a Known Traveler Number (KTN) and see how it could benefit your travels by offering you expedited screening.

At-A-Glance

  • A Known Traveler Number (KTN) is issued to all individuals who are approved for TSA PreCheck® expedited screening,1 and similar services that allow for expedited screening.
  • Expedited screening services could help reduce the time that you spend waiting in line.
  • It’s important to note that your KTN must typically be added to the correct field when booking flights so that a TSA PreCheck indicator appears on your boarding pass.2

A Known Traveler Number (KTN)3 is a number assigned to an individual who’s been approved for TSA PreCheck® or another expedited airport screening service. This number is nine digits long and is composed of a combination of numbers and letters. A KTN could help to reduce the amount of time that you’ll end up spending in line, and many travelers find that it’s a worthwhile investment.

How to Get a Known Traveler Number

You can obtain a KTN by applying for TSA PreCheck or another service that allows for expedited airport screening. This includes CLEAR® Plus, Global Entry, NEXUS, or SENTRI.

 

One way to apply for a Known Traveler Number is online on the TSA PreCheck page on the TSA website. If you go this route, you’ll be asked to provide your full legal name, Social Security number, address, phone number, and email address. Once the application is complete, you can book an appointment to do the in-person portion of TSA PreCheck.

 

You can find an in-person TSA PreCheck enrollment center by entering your zip code in the search box on the TSA website. You should be directed to that page after you submit your pre-enrollment application. The in-person portion takes about ten minutes. You’ll need to provide fingerprints, identity documents, and payment for your KTN.

 

The cost for TSA PreCheck can be found on the TSA PreCheck page on the TSA website, and it will typically be valid for five years after you’re approved. Don’t expect instant approval onsite when you do the in-person portion of the TSA PreCheck. That process takes anywhere from several days to several weeks, depending on whether you have a criminal record or have moved frequently in the past.

Qualifications and Exceptions for Obtaining a KTN

The TSA PreCheck program is available to U.S. citizens, U.S. nationals, and legal permanent residents. The initial application (pre-enrollment) can be done online at the TSA website, but the final approval will need to be done at an in-person enrollment center.

 

Individuals who have been approved for CLEAR Plus, Global Entry, NEXUS, or SENTRI do not need to go through TSA PreCheck. Children under seventeen are also exceptions because they can join an adult who’s already been approved by TSA PreCheck.

Benefits of Being a Known Traveler

Anyone who’s waited in a long line at TSA knows how beneficial a KTN is, helping you bypass that long line and walk through the checkpoint with minimal interference. For many people, saving time alone could make a KTN a worthwhile investment.

 

Here are other benefits to having a KTN:

  • According to TSA numbers published by AAA in March of 2023, 89% of TSA PreCheck passengers waited in line for less than five minutes, saving business travelers time in line translates into increased productivity.4
  • Having a KTN may also ease your stress levels, particularly if you’re traveling with young children.
  • You may receive a KTN more easily along with Global Entry benefits with select credit cards.
  • It could significantly cut down on the hours frequent flyers spend in airports every year, too.

While a KTN could help to reduce the amount of time that you end up spending in line, it’s important to make sure you use it properly. When booking an airline flight, there’s a field to enter your Known Traveler Number. You’ll want to ensure that you enter it at that time so that the TSA PreCheck indicator will appear on your boarding pass. You could lose out on your benefits if you don’t enter this information in at the time of booking.

Certain Credit Cards May Offer Reimbursement

Some credit cards may offer a reimbursement of an expedited airport screening service as a cardholder benefit. This means if you have one of these cards, you could gain access to a KTN even easier.

 

Keep in mind that actual benefits and terms and conditions vary by credit card. You’ll want to check your card’s travel benefits to see what’s included. Enrollment is sometimes required in order to receive certain benefits, so be sure to check whether this is the case. Finally, note that reimbursement may take the form of a statement credit.

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Did you know?

With The Platinum Card® from American Express, you can receive up to $209 in statement credits per calendar year after you sign up and pay for a CLEAR Plus Membership (subject to auto-renewal).5

Frequently Asked Questions

The Takeaway

A Known Traveler Number can help to make travel easier and more efficient, something that many travelers can appreciate. And remember: some credit cards offer reimbursement for a travel service that includes a KTN.


Headshot of Kevin D. Flynn

Kevin D. Flynn is a a financial services provider, business coach, and financial writer. He lives in Leominster, Massachusetts with his wife Evelyn, two cats, and ten wonderful grandchildren.
 
All Credit Intel content is written by freelance authors and commissioned and paid for by American Express.

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