Non-Thai nationals entering Thailand by air, land or sea must submit the Thailand Digital Arrival Card online. The Immigration Bureau says it may be filed within three days before arrival, including the arrival date. The official service is free; use the immigration.go.th address, not a paid lookalike.
Thailand Digital Arrival Card Singapore: the decision table
| Situation | What to do |
|---|---|
| Arrival is more than three days away | Prepare details but wait for the window |
| Arrival is within three days | Submit on the official site |
| Itinerary or accommodation changes | Use the official update function |
| Site error occurs | Keep the error record and contact airport or immigration staff |
The arrival date controls the window
Use Thailand local arrival date, especially for overnight flights. Recheck when transport changes.
One submission needs consistent identity data
Copy passport name, number, nationality and date fields exactly. A nickname or transposed date creates avoidable friction.
Accommodation should be usable
Keep the first address in Thailand and booking confirmation available. Day trips and land crossings still require a complete arrival submission.
TDAC is not a visa
It records arrival information and does not replace visa, visa-exemption or length-of-stay rules.
Protect passport data
Avoid search ads and agents asking for payment. Navigate to the official immigration domain independently and save the confirmation.
Worked example
A flight lands in Bangkok on Friday at 11.30pm. The filing window includes Wednesday, Thursday and Friday. The traveller submits on Wednesday after confirming the hotel, saves the confirmation PDF and carries the booking reference. If the flight is retimed past midnight, the arrival date is rechecked.
Turn the example into a decision record
The worked example is useful only if its inputs are replaced with the reader’s actual dates, amounts, documents or observations. For this task—submit the correct arrival data on time without paying an unofficial intermediary—keep the decision and its supporting record on the same line. That exposes a missing input before the action becomes difficult to reverse.
| Trigger or question | Current action | Evidence to retain |
|---|---|---|
| 1. Arrival is more than three days away | Prepare details but wait for the window | Save the dated input, confirmation or advice that supports this choice. |
| 2. Arrival is within three days | Submit on the official site | Save the dated input, confirmation or advice that supports this choice. |
| 3. Itinerary or accommodation changes | Use the official update function | Save the dated input, confirmation or advice that supports this choice. |
| 4. Site error occurs | Keep the error record and contact airport or immigration staff | Save the dated input, confirmation or advice that supports this choice. |
Record where each answer came from and when it was checked. If a live service, signed document or professional opinion conflicts with a general webpage, preserve both and resolve the difference with the body responsible for the decision. Do not silently substitute a convenient number or date.
Action checklist
- Confirm the Thailand arrival date
- Wait until the three-day window
- Use tdac.immigration.go.th
- Copy passport data exactly
- Enter first accommodation
- Save the confirmation
- Update changed information officially
Two practical tools to keep
A date-window calculator. Put the controlling dates, amounts or observations in one place and attach the evidence beside each input. This makes the decision reproducible if a family member, colleague or adviser needs to check it later.
A passport-to-form field checklist. Test the ordinary case and the failure case before money, a filing or a booking becomes irreversible. Mark calculations as calculations and leave uncertain fields unresolved until an authority or qualified professional confirms them.
What the primary sources establish
| Primary source | Claim used here |
|---|---|
| Thailand Immigration TDAC manual | Official submission steps and required traveller, trip, accommodation and health information. |
| Thailand Immigration TDAC FAQ | Three-day timing, covered travellers, official site and error handling. |
The links sit beside the claims they support. Live services, formal notices and individual facts can change the outcome, so re-open the controlling page immediately before acting.
Continue with the next useful step
For the adjacent task, read the Suvarnabhumi-to-Bangkok transport comparison. If the decision moves into a different stage, continue with the Chao Phraya boat route and fare guide.
Errors that change the outcome
- Paying an unofficial TDAC site
- Submitting too early
- Using departure date instead of arrival date
- Treating TDAC as a visa
- Keeping no confirmation
Keep dated records, confirmations and advice used for the decision. This article explains public information for a general fact pattern; it does not determine an individual legal, tax, medical, investment, employment or contractual outcome.
A final challenge before acting
The intended reader is a singapore traveller entering thailand. Before closing the task, challenge the file against the common failure points below. A “not applicable” answer should still have a reason, especially where a deadline, eligibility rule, payment, booking or safety decision is involved.
- Have you ruled this out? Paying an unofficial TDAC site. Write down the fact or document that answers it; an assumption is not a completed check.
- Have you ruled this out? Submitting too early. Write down the fact or document that answers it; an assumption is not a completed check.
- Have you ruled this out? Using departure date instead of arrival date. Write down the fact or document that answers it; an assumption is not a completed check.
- Have you ruled this out? Treating TDAC as a visa. Write down the fact or document that answers it; an assumption is not a completed check.
- Have you ruled this out? Keeping no confirmation. Write down the fact or document that answers it; an assumption is not a completed check.
Escalate any unresolved consequential point to the named authority or an appropriately qualified professional. The aim is not to collect more material; it is to identify the one missing fact that could change the result.
Questions readers ask
Who needs a TDAC?
Thailand Immigration says non-Thai nationals entering by air, land or sea.
How early can it be filed?
Within three days before arrival, including arrival day.
What if there is no smartphone?
The FAQ says kiosks and Wi-Fi are available on arrival, but advance filing is safer.
