Samui Airport (USM): exchange rates today

Today's USD market in Bangkok, in numbers

86 money changers in Bangkok quote US Dollar (USD) today. The best buying rate is 33.50 THB per 1 USD at Superrich Thailand — Headquarter Rajdamri 1; the lowest is 33.20 at K81 Exchange (Ram Inthra 81, K79 group). The gap between them is 0.9%, which comes to about 30 THB on 100 USD. 8 of the 86 shops are within 0.1% of the best rate, so for most readers the nearest counter in that group is the right choice.

The mid-market rate is 33.55. The best shop pays 0.16% below it, which is the margin it keeps on a cash transaction; the lowest-paying shop keeps 1.05%. The top rate today comes from Superrich Thailand (Green); 9 chains quote USD in Bangkok. The best-paying counters are in Headquarter Rajdamri 1, Vibhavadi 22, MBK Center 3rd floor.

Superrich Thailand — Headquarter Rajdamri 1 pays 33.50 for 100 notes but 33.24 for 1, a difference of 0.78%, which is more than the gap between most shops in town.

35 of the 63 shops with published hours stay open until 20:00 or later; the latest closes at 24:00. 58 of them open on Sunday.

A week ago the best USD rate in Bangkok was 33.65; thirty days ago it was 33.47. Over the same month the mid-market rate moved from 33.67 to 33.55 (-0.34%).

Changing baht back into USD is cheapest at Grand Superrich (Soi Ratchadamri 1, Pratunam), which sells at 33.52; the round trip through the best buying and the best selling rate costs about 0.06%.

In practice: change at any shop in the top group near you, bring the largest notes you have, and check the board before handing over cash, because the shop's own board is final.

Figures as read at Nov 8, 05:52 (Thailand time); they move during the day.

Changing money on Koh Samui

Koh Samui has one tracked counter, and it is not a money changer in the usual sense: the Government Savings Bank exchange counters at Samui Airport. No shop elsewhere on the island is tracked, so the list is a single line.

The site does not have confirmed opening hours for the counters, so do not rely on them for a late arrival without checking. They quote 17 currencies.

On 28 September 2026 the best US dollar buying rate was 33.18 baht against a mid-market rate of 33.42. That is 0.33 baht below the best rate tracked in Bangkok the same day, or 330 baht on a thousand dollars, and the Japanese yen best of 0.2079, against 0.213 in the capital, tells the same story. This is what the site’s guides call the island rate penalty, and the practical answer is to arrive with baht already in hand. The guide to Samui, Phangan and Tao and a cash plan made on the mainland is written for exactly that, and the island rate penalty explains how large it is and how to avoid it.