The answer to where can I find my TSA number is almost always one of three places. Your approval email has it, your TSA PreCheck account has it, and the back of a Global Entry card has it too.
If Global Entry approved you, stop looking for a separate PreCheck number. The nine digit PASSID on that card is your Known Traveler Number. The fix here usually takes under five minutes.
What a Known Traveler Number actually is
A Known Traveler Number, or KTN, is the identifier TSA issues once you are approved for expedited screening. It is not the same thing as your approval letter or your enrollment email.
The approval email is the notice. The KTN is the number printed inside it, and that is the only part that goes into an airline reservation.
Losing the email does not mean the number is gone. It still lives in your online account, and for some travelers it also sits on a physical card.
The places your Known Traveler Number can be found
Start with the approval email from your enrollment. Search your inbox for Known Traveler Number or for TSA PreCheck instead of scrolling, since that message can be months old.
If the email is gone, TSA runs its own lookup tool on the PreCheck page for exactly this problem. It works for TSA PreCheck members only.
It does not cover Global Entry, NEXUS, or SENTRI members, and that distinction trips a lot of people up. An airline profile is the third place to check.
If you ever saved your KTN to a frequent flyer account, it is still there. Check your travel document settings even if you do not remember adding it.
The Global Entry case is different
Where can I find my TSA number is a simpler question for Global Entry members. There is no separate PreCheck number to dig up. Your PASSID does the job instead.
That PASSID is the nine digit number on the back of your Global Entry card. It works as your Known Traveler Number for every airline booking.
That one fact answers how can I get my TSA PreCheck number for most Global Entry members. The number already exists, and it just needs to go in the right field.
If the card is lost, log into your Trusted Traveler Programs account rather than TSA’s site. Global Entry numbers live there, not in TSA’s PreCheck lookup tool.
Some travelers hold both a PreCheck KTN and a Global Entry PASSID. Either number will activate PreCheck on a boarding pass.
When the lookup tool comes up empty
TSA’s tool matches on identity details. A typo or a name change since enrollment is the usual reason a search fails.
It typically asks for your first name, last name, and date of birth. Some searches also ask for a Redress Number or other identifying details from your original application.
Try your full legal name exactly as it appeared on the ID you enrolled with. Skip nicknames and shortened versions.
If the search still fails, call the TSA PreCheck Contact Center. A phone agent can look you up using the same identity details.
Community threads on trusted traveler forums describe the same scenario again and again. An applicant remembers their name spelled slightly differently on a driver’s license than on their enrollment form.
That one small mismatch breaks the automatic search every time. The tool itself is rarely the problem.
Adding the number to a booking or a boarding pass
Once you have the number, add it to your reservation through your airline. You can usually do this during booking or afterward through manage trip.
Most airlines also let you save it once to your traveler profile. From then on it applies automatically to every future booking.
A boarding pass already printed at home will not update on its own. Reissue it once the KTN is on the reservation, or ask an agent at the counter.
PreCheck will not appear on a pass generated before the number was added. Heading to the airport soon anyway?
Review the current airport security screening rules too. A correct KTN gets you into the shorter line, but it does not change what you can carry through it.
Why a correct number sometimes still does not show PreCheck
The single biggest cause of a missing PreCheck mark is a name mismatch, not a bad KTN. Middle names, suffixes like Jr, and maiden names are the usual culprits.
Approval timelines vary too. Travelers who just applied should read how long PreCheck approval actually takes before assuming their number is wrong.
Book every ticket using the exact name on the government ID you plan to travel with. Use that same name every time you enter your KTN.
A wrong date of birth in the reservation causes the identical problem. Check both fields, not just the number.
If everything matches and PreCheck still will not appear, confirm your airline actually participates in the program. Not every route or every partner carrier does.
From there, contact TSA directly rather than typing the same number in again.
What to do before your next flight
Add your KTN to your airline profile now, not the morning of your trip. Run your existing bookings through a trip planning checklist to catch any reservation missing the number.
It takes a few minutes and saves a slow line later. Do this once, and where can I find my TSA number stops being a question you ask at the counter.
Run your list through a packing list screener as well. PreCheck speeds up the line, but it does not change what is allowed through it.
Common questions
Where can I find my TSA number if I never got an approval email?
Check your spam folder first. Then use TSA’s lookup tool on its PreCheck page with your name and date of birth.
If neither works, call the TSA PreCheck Contact Center, since they can pull the record from your enrollment directly.
Is my Known Traveler Number the same as my Redress Number?
No. A Redress Number resolves watchlist mismatch issues and is a separate identifier some travelers carry.
Your KTN is tied to your PreCheck or trusted traveler approval. The two numbers are not interchangeable in a booking.
I can’t find my TSA PreCheck number and I only have Global Entry. What do I use?
Use the PASSID on the back of your Global Entry card. It functions as your Known Traveler Number for every airline reservation.
There is no separate PreCheck number to locate.
How can I look up my TSA PreCheck number without my card?
TSA PreCheck members can search by identity details on TSA’s own lookup page. Global Entry, NEXUS, and SENTRI members should log into their Trusted Traveler Programs account instead.
TSA’s tool does not cover those programs.
Does my Known Traveler Number expire?
It stays tied to your membership, so it is valid as long as your enrollment is active. Once that membership lapses and is not renewed, the number stops producing the PreCheck mark.
Why does my boarding pass still lack PreCheck after I added the number?
A name or date of birth mismatch between the reservation and your enrollment record is the most common reason. Confirm both fields match your ID exactly.
Then check that your airline actually participates in TSA PreCheck before assuming the number itself is wrong.