| Rank | LW | Release
| Gross | %± LW | Theaters | Change | Average | Total Gross | Weeks | Distributor
| New This Week
| Estimated
|
|---|
| 1 | - | Oh My Ghosts! | $864,566 | - | 131 | - | $6,599 | $893,839 | 1 | Pranakorn Films | true | false |
| 2 | - | G-Force | $483,229 | - | 78 | - | $6,195 | $692,153 | 1 | Walt Disney Pictures | true | false |
| 3 | - | Sorority Row | $91,688 | - | 58 | - | $1,580 | $91,688 | 1 | Mongkol Major | true | false |
| 4 | 2 | The Proposal | $70,140 | -53.2% | 37 | -5 | $1,895 | $698,899 | 3 | Walt Disney Pictures | false | false |
| 5 | - | The Time Traveler's Wife | $53,444 | - | 24 | - | $2,226 | $53,444 | 1 | Warner Bros. | true | false |
| 6 | 1 | Phobia 2 | $49,705 | -76% | 54 | -75 | $920 | $3,287,296 | 4 | GMM Tai Hub (GTH) | false | false |
| 7 | 3 | District 9 | $34,504 | -71.4% | 44 | -6 | $784 | $520,300 | 3 | M Pictures | false | false |
| 8 | 4 | Pandorum | $32,466 | -69.3% | 56 | -22 | $579 | $183,290 | 2 | Mongkol Major | false | false |
| 9 | 5 | Dreamaholic | $10,303 | -88.6% | 43 | -22 | $239 | $407,115 | 3 | Mongkol Film Company | false | false |
| 10 | - | Broken Embraces | $2,854 | - | 2 | - | $1,427 | $2,854 | 1 | M Pictures | true | false |
| 11 | 7 | Whiteout | $2,544 | -91.5% | 11 | -28 | $231 | $132,816 | 3 | Warner Bros. | false | false |
| 12 | 6 | The Final Destination | $2,264 | -95.1% | 4 | -51 | $566 | $1,365,007 | 5 | Warner Bros. | false | false |
| 13 | 11 | Rookies the Movie: Graduation | $1,288 | -38.8% | 2 | - | $644 | $3,942 | 2 | N/A | false | false |
| 14 | 19 | Harry Potter and the Half-Blood Prince | $1,276 | +82.3% | 1 | - | $1,276 | $4,141,173 | 12 | Warner Bros. | false | false |
| 15 | 14 | Ponyo | $769 | -50.1% | 2 | - | $384 | $26,906 | 6 | M Pictures | false | false |
| 16 | 8 | Gamer | $685 | -92.6% | 4 | -23 | $171 | $385,364 | 5 | M Pictures | false | false |
| 17 | 17 | Crows Zero II | $618 | -38.3% | 1 | - | $618 | $8,247 | 4 | N/A | false | false |
| 18 | 16 | Transformers: Revenge of the Fallen | $579 | -51% | 1 | -8 | $579 | $6,022,157 | 15 | United International Pictures | false | false |
| 19 | 12 | 9 | $406 | -79.6% | 1 | - | $406 | $18,251 | 4 | M Pictures | false | false |
| 20 | 9 | Land of the Lost | $351 | -92.2% | 4 | -2 | $87 | $37,279 | 5 | United International Pictures | false | false |
| 21 | 15 | Inglourious Basterds | $245 | -83.2% | 1 | -2 | $245 | $309,390 | 7 | United International Pictures | false | false |
| 22 | 13 | Coco Before Chanel | $131 | -92.4% | 1 | -4 | $131 | $65,459 | 7 | N/A | false | false |
