In the latest full‑calendar‑year data, about 32.97 million international tourists visited Thailand in 2025 (1 January to 31 December 2025).
For the “last year” ending 31 March 2026
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Since no official public dataset breaks down exactly 1 April 2025 – 31 March 2026, you can approximate by combining:
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2025 total international arrivals: ≈32.97 million (Jan–Dec 2025).
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Jan–Mar 2026 arrivals: ≈9.17 million (Jan–March, not counting April 2026).
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This implies roughly about 32–33 million international visitors came to Thailand in the calendar year 2025, and over 9 million in the first three months of 2026.