Made a mistake on your TDAC? How to change it after submitting

Checked 5 November 2026 by Darius Cheung. Independent guide, not a government website.

Short answer

You can update a submitted TDAC through the site's update option, using your TH Digital Arrival Card number. You can't update your full name in passport or other locked identity details: the site says to make a new submission instead. A changed flight or a changed hotel generally goes through update, provided your arrival date is inside the three-day window.

What the site says

The confirmation page reads: "If need be, you can update the submitted information prior to the trip." The update screen then adds: "Please note that you will not be able to update the following information", followed by a list that includes "Full Name (In Passport)", and ends: "If you wish to update any of the fields above, please make a new submission."

Pattaya Mail reported before launch that passport number, name, nationality and date of birth can't be changed once submitted. That matches the update screen's locked fields as far as we can read them from the code.

Which fix do you need?

What went wrongWhat to do
Typo in your nameNew submission
Typo in your passport numberNew submission. Don't let this one slide, because the number is what identifies you at the border.
Wrong nationality or birth dateNew submission
Flight number changed, same dayUpdate
Hotel changedUpdate
Arrival moved by a day or twoUpdate, if the new date is in the calendar
Trip moved by a week or moreThe new date can't be picked yet. Wait until you're within three days of it, then update or file again.
Trip cancelledWe found no official way to cancel. A card is tied to its one entry, so there's nothing to use if you don't travel.

How to update

  1. Go to tdac.immigration.go.th and find the update option for your arrival card.
  2. Search for your card. You'll need your TH Digital Arrival Card number (at least seven letters and digits), which is in your confirmation, along with your passport details.
  3. Change what's needed and review it. The form warns: "Please ensure all information is accurate before submitting the form."
  4. Submit. A successful update shows "Your Thailand Digital Arrival Card submission is update!" (their wording).

We've read these steps from the site's text and code, but we haven't run them, because we don't submit test data to government forms. Labels may differ a little on screen.

Before you submit, you can still edit freely

The review page is the cheap place to catch errors. It says: "Use 'Edit' to modify information, 'Delete' to remove entries, and select 'Submit' when all information is complete and correct." Check names and passport numbers there against the passport itself, and watch for the letter O and the number 0.

Filing a new one

A new submission is free on the official site. Each TDAC is for one entry, so show officers the most recent one if asked. We couldn't find an official statement on whether the earlier one needs cancelling, so if you're worried, mention it to the officer rather than guessing.

Questions people ask

Is a small name typo a problem at immigration?

We can't say how an officer will treat it. Since the fix is free, filing again is the safer choice if you're inside the window.

Do I need a new TDAC for a delayed flight?

If you land on the same day with a different flight, update the flight. If the date moves too, update the date. The embassy doesn't describe every case, so an officer has the last word.

Can someone else update it for me?

The search needs your card and passport details, so anyone with those could enter them. Only give them to people you trust, and never to a paid site you found through an ad.

A wrong passport digit means a whole new card. ArrivalFiller reuses what you entered and got right, and you check it before you press Submit.

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Where this comes from

Rules change, so check the official site before you travel. Where we quote a form's message, we copied it from the form's own public code. Some messages may rarely appear, and we don't run test submissions on government forms.