| Rank | LW | Release
| Gross | %± LW | Theaters | Change | Average | Total Gross | Weeks | Distributor
| New This Week
| Estimated
|
|---|
| 1 | 1 | Harry Potter and the Half-Blood Prince | $653,210 | -65.1% | 192 | -146 | $3,402 | $3,172,739 | 2 | Warner Bros. | false | false |
| 2 | - | Nee Dtaam Galileo | $388,562 | - | 122 | - | $3,184 | $388,562 | 1 | N/A | true | false |
| 3 | - | Public Enemies | $160,608 | - | 83 | - | $1,935 | $160,608 | 1 | United International Pictures | true | false |
| 4 | 2 | Wongkamlao | $31,327 | -67.1% | 45 | -11 | $696 | $2,623,364 | 4 | Mongkol Film Company | false | false |
| 5 | 3 | Transformers: Revenge of the Fallen | $21,404 | -67.4% | 40 | -32 | $535 | $5,845,996 | 5 | United International Pictures | false | false |
| 6 | 4 | Ice Age: Dawn of the Dinosaurs | $14,486 | -51.2% | 11 | -35 | $1,316 | $1,095,770 | 4 | 20th Century Fox International | false | false |
| 7 | 5 | District 13: Ultimatum | $1,629 | -81.9% | 6 | -7 | $271 | $72,974 | 3 | M Pictures | false | false |
| 8 | 8 | Departures | $1,498 | -17.5% | 1 | - | $1,498 | $24,937 | 6 | Mongkol Major | false | false |
| 9 | 7 | Chéri | $1,297 | -33.4% | 1 | - | $1,297 | $9,039 | 3 | N/A | false | false |
| 10 | - | April Bride | $863 | - | 1 | - | $863 | $863 | 1 | N/A | true | false |
| 11 | 9 | Up | $630 | -45.5% | 2 | -1 | $315 | $1,499,887 | 7 | Walt Disney Pictures | false | false |
| 12 | 6 | The Secret of Moonacre | $390 | -90.8% | 1 | -29 | $390 | $83,469 | 3 | Mongkol Major | false | false |
| 13 | 10 | 17 Again | $345 | -48% | 2 | - | $172 | $154,022 | 7 | Warner Bros. | false | false |
| 14 | 13 | Fireflies in the Garden | $162 | -35.5% | 1 | - | $162 | $10,466 | 115 | Mongkol Major | false | false |
