| Rank | LW | Release
| Gross | %± LW | Theaters | Change | Average | Total Gross | Weeks | Distributor
| New This Week
| Estimated
|
|---|
| 1 | - | Phobia 2 | $1,450,261 | - | 220 | - | $6,592 | $1,905,806 | 1 | GMM Tai Hub (GTH) | true | false |
| 2 | 1 | The Final Destination | $179,104 | -69.1% | 92 | -29 | $1,946 | $1,005,291 | 2 | Warner Bros. | false | false |
| 3 | 3 | Gamer | $73,802 | -58.9% | 59 | -12 | $1,250 | $313,480 | 2 | M Pictures | false | false |
| 4 | - | The Proposal | $44,627 | - | 30 | - | $1,487 | $44,627 | - | Walt Disney Pictures | - | false |
| 5 | 2 | My Ex | $36,793 | -88.3% | 64 | -31 | $574 | $1,386,152 | 3 | RS Film & Distribution | false | false |
| 6 | - | District 9 | $27,241 | - | 36 | - | $756 | $27,241 | - | M Pictures | - | false |
| 7 | - | My Sister's Keeper | $9,541 | - | 8 | - | $1,192 | $9,541 | 1 | Warner Bros. | true | false |
| 8 | 7 | Land of the Lost | $8,013 | -36.9% | 6 | +2 | $1,335 | $28,071 | 2 | United International Pictures | false | false |
| 9 | - | The Naked Kitchen | $7,408 | - | 9 | - | $823 | $7,408 | 1 | Mongkol Major | true | false |
| 10 | 5 | Inglourious Basterds | $6,678 | -73.3% | 11 | -25 | $607 | $296,303 | 4 | United International Pictures | false | false |
| 11 | - | 9 | $6,443 | - | 1 | - | $6,443 | $7,250 | 1 | M Pictures | true | false |
| 12 | 16 | Transformers: Revenge of the Fallen | $5,822 | +294.4% | 24 | +23 | $242 | $5,923,711 | 12 | United International Pictures | false | false |
| 13 | 8 | Coco Before Chanel | $3,757 | -54.8% | 7 | +2 | $536 | $58,528 | 4 | N/A | false | false |
| 14 | - | Crows Zero II | $2,976 | - | 1 | - | $2,976 | $2,976 | 1 | N/A | true | false |
| 15 | 10 | Ponyo | $2,095 | -66.9% | 2 | - | $1,047 | $20,920 | 3 | M Pictures | false | false |
| 16 | 4 | G.I. Joe: The Rise of Cobra | $2,020 | -93.1% | 7 | -52 | $288 | $2,378,327 | 6 | United International Pictures | false | false |
| 17 | 14 | Harry Potter and the Half-Blood Prince | $1,728 | -27.6% | 1 | - | $1,728 | $4,072,324 | 9 | Warner Bros. | false | false |
| 18 | 18 | Echelon Conspiracy | $1,223 | +58.4% | 2 | -2 | $611 | $17,463 | 7 | N/A | false | false |
| 19 | 6 | Rahtree Revenge | $394 | -98.4% | 12 | -37 | $32 | $518,044 | 4 | Mongkol Film Company | false | false |
| 20 | 9 | Orphan | $262 | -96.5% | 2 | -26 | $131 | $158,321 | 4 | Warner Bros. | false | false |
