| 2004-04-06 | @ ATL | 1 | W 7-2 | 1-0 | 2 | 49,460 | Tom Glavine | Russ Ortiz | Tom Glavine | Russ Ortiz | | 7 | 2 | 5 |
| 2004-04-07 | @ ATL | 2 | L 10-18 | 1-1 | 4 | 22,775 | Steve Trachsel | Mike Hampton | Kevin Gryboski | Steve Trachsel | | 17 | 20 | -3 |
| 2004-04-08 | @ ATL | 3 | L 8-10 | 1-2 | 4 | 26,585 | Dan Wheeler | John Thomson | Will Cunnane | John Franco | John Smoltz | 25 | 30 | -5 |
| 2004-04-09 | @ MON | 4 | W 3-2 | 2-2 | 3 | 14,739 | Tyler Yates | Zach Day | David Weathers | Luis Ayala | Orber Moreno | 28 | 32 | -4 |
| 2004-04-10 | @ MON | 5 | L 0-1 | 2-3 | 4 | 11,957 | Al Leiter | John Patterson | John Patterson | Jae Weong Seo | Rocky Biddle | 28 | 33 | -5 |
| 2004-04-11 | @ MON | 6 | W 4-1 | 3-3 | 3 | 10,623 | Tom Glavine | Livan Hernandez | Tom Glavine | Livan Hernandez | Braden Looper | 32 | 34 | -2 |
| 2004-04-12 | vs ATL | 7 | W 10-6 | 4-3 | 2 | 53,666 | Steve Trachsel | Mike Hampton | Steve Trachsel | Mike Hampton | Braden Looper | 42 | 40 | 2 |
| 2004-04-14 | vs ATL | 8 | L 1-6 | 4-4 | 3 | 15,894 | Tyler Yates | John Thomson | John Thomson | Tyler Yates | | 43 | 46 | -3 |
| 2004-04-15 | vs ATL | 9 | W 4-0 | 5-4 | 2 | 33,212 | Al Leiter | Horacio Ramirez | Al Leiter | Horacio Ramirez | | 47 | 46 | 1 |
| 2004-04-16 | vs PIT | 10 | L 6-7 | 5-5 | 3 | 18,554 | Tom Glavine | Kip Wells | Kip Wells | Orber Moreno | Jose Mesa | 53 | 53 | 0 |
| 2004-04-17 | vs PIT | 11 | L 1-2 | 5-6 | 3 | 40,172 | Steve Trachsel | Oliver Perez | Brian Meadows | Steve Trachsel | Jose Mesa | 54 | 55 | -1 |
| 2004-04-18 | vs PIT | 12 | L 1-8 | 5-7 | 4 | 44,345 | Jae Weong Seo | Kris Benson | Kris Benson | Jae Weong Seo | | 55 | 63 | -8 |
| 2004-04-19 | vs MON | 13 | W 4-1 | 6-7 | 3 | 14,002 | Tyler Yates | Tomo Ohka | Tyler Yates | Tomo Ohka | Braden Looper | 59 | 64 | -5 |
| 2004-04-20 | vs MON | 14 | L 1-2 | 6-8 | 3 | 14,513 | Al Leiter | Zach Day | Zach Day | David Weathers | Rocky Biddle | 60 | 66 | -6 |
| 2004-04-21 | vs MON | 15 | L 1-2 | 6-9 | 3 | 23,565 | Tom Glavine | Livan Hernandez | Livan Hernandez | Tom Glavine | Rocky Biddle | 61 | 68 | -7 |
| 2004-04-22 | vs MON | 16 | W 3-2 | 7-9 | 3 | 15,062 | Steve Trachsel | John Patterson | Steve Trachsel | Chad Bentz | Braden Looper | 64 | 70 | -6 |
| 2004-04-23 | @ CHN | 17 | L 1-3 | 7-10 | 3 | 38,862 | Jae Weong Seo | Greg Maddux | Greg Maddux | Jae Weong Seo | Joe Borowski | 65 | 73 | -8 |
| 2004-04-24 | @ CHN | 18 | L 0-3 | 7-11 | 4 | 39,043 | Tyler Yates | Kerry Wood | Kerry Wood | Tyler Yates | LaTroy Hawkins | 65 | 76 | -11 |
| 2004-04-25 | @ CHN | 19 | L 1-4 | 7-12 | 4 | 38,635 | Al Leiter | Matt Clement | Matt Clement | Al Leiter | Joe Borowski | 66 | 80 | -14 |
| 2004-04-27 | @ LAN | 20 | W 9-5 | 8-12 | 4 | 28,524 | Tom Glavine | Hideo Nomo | Tom Glavine | Hideo Nomo | | 75 | 85 | -10 |
| 2004-04-28 | @ LAN | 21 | L 2-3 | 8-13 | 4 | 29,319 | Steve Trachsel | Odalis Perez | Odalis Perez | Steve Trachsel | Eric Gagne | 77 | 88 | -11 |
| 2004-04-29 | @ LAN | 22 | W 6-1 | 9-13 | 4 | 32,067 | Jae Weong Seo | Jeff Weaver | Jae Weong Seo | Jeff Weaver | | 83 | 89 | -6 |
| 2004-04-30 | @ SDN | 23 | L 6-7 | 9-14 | 4 | 41,971 | Tyler Yates | Brian Lawrence | Brian Lawrence | Tyler Yates | Akinori Otsuka | 89 | 96 | -7 |
| 2004-05-01 | @ SDN | 24 | L 1-3 | 9-15 | 4 | 42,064 | Al Leiter | Jake Peavy | Jake Peavy | John Franco | Trevor Hoffman | 90 | 99 | -9 |
| 2004-05-02 | @ SDN | 25 | W 6-2 | 10-15 | 4 | 41,965 | Tom Glavine | Ismael Valdez | Tom Glavine | Ismael Valdez | | 96 | 101 | -5 |
| 2004-05-04 | vs SFN | 26 | W 6-2 | 11-15 | 4 | 30,532 | Steve Trachsel | Brett Tomko | Steve Trachsel | Brett Tomko | | 102 | 103 | -1 |
| 2004-05-05 | vs SFN | 27 | W 8-2 | 12-15 | 4 | 19,974 | Jae Weong Seo | Jerome Williams | David Weathers | Felix Rodriguez | | 110 | 105 | 5 |
| 2004-05-06 | vs SFN | 28 | W 2-1 | 13-15 | 3 | 23,314 | Al Leiter | Jason Schmidt | David Weathers | Jim Brower | | 112 | 106 | 6 |
| 2004-05-07 | vs MIL | 29 | L 5-7 | 13-16 | 4 | 27,841 | Tom Glavine | Doug Davis | Doug Davis | Tom Glavine | | 117 | 113 | 4 |
| 2004-05-08 | vs MIL | 30 | L 4-6 | 13-17 | 4 | 29,212 | Tyler Yates | Adrian Hernandez | Matt Kinney | Tyler Yates | Danny Kolb | 121 | 119 | 2 |
| 2004-05-09 | vs MIL | 31 | W 6-5 | 14-17 | 4 | 29,686 | Steve Trachsel | Victor Santos | Dan Wheeler | Ben Ford | | 127 | 124 | 3 |
| 2004-05-10 | @ ARI | 32 | L 8-12 | 14-18 | 4 | 28,638 | James Baldwin | Casey Daigle | Casey Daigle | James Baldwin | | 135 | 136 | -1 |
| 2004-05-11 | @ ARI | 33 | L 5-9 | 14-19 | 4 | 34,263 | Al Leiter | Elmer Dessens | Brian Bruney | Al Leiter | | 140 | 145 | -5 |
| 2004-05-12 | @ ARI | 34 | W 1-0 | 15-19 | 3 | 27,750 | Tom Glavine | Randy Johnson | Tom Glavine | Randy Johnson | Braden Looper | 141 | 145 | -4 |
| 2004-05-13 | @ ARI | 35 | W 7-4 | 16-19 | 3 | 25,573 | Jae Weong Seo | Brandon Webb | Jae Weong Seo | Brandon Webb | Braden Looper | 148 | 149 | -1 |
| 2004-05-14 | @ HOU | 36 | W 8-3 | 17-19 | 3 | 35,849 | Steve Trachsel | Roy Oswalt | Steve Trachsel | Roy Oswalt | | 156 | 152 | 4 |
| 2004-05-15 | @ HOU | 37 | L 4-7 | 17-20 | 4 | 42,581 | James Baldwin | Andy Pettitte | Andy Pettitte | James Baldwin | Octavio Dotel | 160 | 159 | 1 |
| 2004-05-16 | @ HOU | 38 | W 3-2 | 18-20 | 3 | 43,247 | Matt Ginter | Roger Clemens | Dan Wheeler | Brandon Backe | | 163 | 161 | 2 |
| 2004-05-18 | vs SLN | 39 | W 5-4 | 19-20 | 3 | 28,880 | Tom Glavine | Matt Morris | Ricky Bottalico | Jason Isringhausen | | 168 | 165 | 3 |
| 2004-05-19 | vs SLN | 40 | L 0-1 | 19-21 | 3 | 20,229 | Steve Trachsel | Jeff Suppan | Cal Eldred | Mike Stanton | Steve Kline | 168 | 166 | 2 |
| 2004-05-20 | vs SLN | 41 | L 4-11 | 19-22 | 3 | 21,874 | Jae Weong Seo | Jason Marquis | Jason Marquis | Jae Weong Seo | | 172 | 177 | -5 |
| 2004-05-21 | vs COL | 42 | W 9-7 | 20-22 | 3 | 20,148 | Matt Ginter | Jason Young | Matt Ginter | Jason Young | | 181 | 184 | -3 |
| 2004-05-22 | vs COL | 43 | W 5-4 | 21-22 | 3 | 27,526 | Tyler Yates | Aaron Cook | David Weathers | Vladimir Nunez | Braden Looper | 186 | 188 | -2 |
| 2004-05-23 | vs COL | 44 | W 4-0 | 22-22 | 3 | 37,486 | Tom Glavine | Shawn Estes | Tom Glavine | Shawn Estes | | 190 | 188 | 2 |
| 2004-05-25 | vs PHI | 45 | W 5-0 | 23-22 | 3 | 29,385 | Steve Trachsel | Eric Milton | Steve Trachsel | Eric Milton | | 195 | 188 | 7 |
| 2004-05-26 | vs PHI | 46 | L 4-7 | 23-23 | 3 | 20,349 | Matt Ginter | Brett Myers | Roberto Hernandez | John Franco | Tim Worrell | 199 | 195 | 4 |
| 2004-05-28 | @ FLO | 47 | L 1-2 | 23-24 | 4 | 25,299 | Tom Glavine | Dontrelle Willis | Dontrelle Willis | Tom Glavine | Armando Benitez | 200 | 197 | 3 |
| 2004-05-29 | @ FLO | 48 | L 2-3 | 23-25 | 4 | 31,325 | Jae Weong Seo | Carl Pavano | Justin Wayne | Braden Looper | | 202 | 200 | 2 |
| 2004-05-30 | @ FLO | 49 | L 6-8 | 23-26 | 4 | 30,896 | Steve Trachsel | Josh Beckett | Toby Borland | Mike Stanton | Armando Benitez | 208 | 208 | 0 |
| 2004-05-31 | @ PHI | 50 | W 5-3 | 24-26 | 4 | 43,620 | Matt Ginter | Brett Myers | Orber Moreno | Brett Myers | Braden Looper | 213 | 211 | 2 |
| 2004-06-01 | @ PHI | 51 | W 4-1 | 25-26 | 4 | 34,436 | Al Leiter | Kevin Millwood | Ricky Bottalico | Tim Worrell | Braden Looper | 217 | 212 | 5 |
| 2004-06-02 | @ PHI | 52 | W 5-3 | 26-26 | 4 | 37,625 | Tom Glavine | Randy Wolf | David Weathers | Roberto Hernandez | Braden Looper | 222 | 215 | 7 |
| 2004-06-03 | vs FLO | 53 | W 4-1 | 27-26 | 4 | 20,832 | Jae Weong Seo | A.J. Burnett | Jae Weong Seo | A.J. Burnett | Braden Looper | 226 | 216 | 10 |
| 2004-06-04 | vs FLO | 54 | L 1-5 | 27-27 | 4 | 23,266 | Steve Trachsel | Carl Pavano | Carl Pavano | Steve Trachsel | Armando Benitez | 227 | 221 | 6 |
| 2004-06-05 | vs FLO | 55 | L 6-7 | 27-28 | 4 | 24,803 | Matt Ginter | Tommy Phelps | Matt Perisho | David Weathers | Armando Benitez | 233 | 228 | 5 |
| 2004-06-06 | vs FLO | 56 | W 5-2 | 28-28 | 4 | 25,835 | Al Leiter | Brad Penny | Al Leiter | Brad Penny | | 238 | 230 | 8 |
| 2004-06-08 | @ MIN | 57 | L 1-2 | 28-29 | 4 | 16,181 | Tom Glavine | Brad Radke | Juan Rincon | Mike Stanton | | 239 | 232 | 7 |
| 2004-06-09 | @ MIN | 58 | L 3-5 | 28-30 | 4 | 17,507 | Steve Trachsel | Johan Santana | Johan Santana | Steve Trachsel | Joe Nathan | 242 | 237 | 5 |
| 2004-06-10 | @ MIN | 59 | L 2-3 | 28-31 | 4 | 16,706 | Matt Ginter | Kyle Lohse | Grant Balfour | Ricky Bottalico | | 244 | 240 | 4 |
| 2004-06-11 | @ KCA | 60 | L 5-7 | 28-32 | 4 | 23,243 | Jae Weong Seo | Darrell May | Darrell May | Jae Weong Seo | Jeremy Affeldt | 249 | 247 | 2 |
| 2004-06-12 | @ KCA | 61 | L 3-4 | 28-33 | 4 | 23,890 | Al Leiter | Chris George | Jeremy Affeldt | David Weathers | | 252 | 251 | 1 |
| 2004-06-13 | @ KCA | 62 | W 5-2 | 29-33 | 4 | 24,632 | Tom Glavine | Zack Greinke | Tom Glavine | Zack Greinke | Braden Looper | 257 | 253 | 4 |
| 2004-06-15 | vs CLE | 63 | W 7-2 | 30-33 | 4 | 22,783 | Steve Trachsel | Jason Davis | Steve Trachsel | Jason Davis | | 264 | 255 | 9 |
| 2004-06-16 | vs CLE | 64 | L 1-9 | 30-34 | 4 | 29,512 | Matt Ginter | CC Sabathia | CC Sabathia | Matt Ginter | | 265 | 264 | 1 |
| 2004-06-17 | vs CLE | 65 | W 6-2 | 31-34 | 4 | 17,675 | Jae Weong Seo | Scott Elarton | Ricky Bottalico | Rick White | | 271 | 266 | 5 |
| 2004-06-18 | vs DET | 66 | W 3-2 | 32-34 | 3 | 36,141 | Tom Glavine | Nate Robertson | Braden Looper | Danny Patterson | | 274 | 268 | 6 |
| 2004-06-19 | vs DET | 67 | W 4-3 | 33-34 | 3 | 36,925 | Al Leiter | Jason Johnson | Braden Looper | Craig Dingman | | 278 | 271 | 7 |
| 2004-06-20 | vs DET | 68 | W 6-1 | 34-34 | 3 | 39,446 | Steve Trachsel | Jeremy Bonderman | Steve Trachsel | Jeremy Bonderman | | 284 | 272 | 12 |
| 2004-06-22 | vs CIN | 69 | W 7-4 | 35-34 | 3 | 19,301 | Matt Ginter | Paul Wilson | John Franco | Paul Wilson | Braden Looper | 291 | 276 | 15 |
| 2004-06-23 | vs CIN | 70 | L 4-6 | 35-35 | 3 | 32,423 | Jae Weong Seo | Todd Van Poppel | Mike Matthews | John Franco | Danny Graves | 295 | 282 | 13 |
| 2004-06-24 | vs CIN | 71 | L 2-6 | 35-36 | 3 | 23,827 | Tom Glavine | Cory Lidle | Cory Lidle | Tom Glavine | | 297 | 288 | 9 |
| 2004-06-26 | @ NYA | 72 | W 9-3 | 36-36 | 3 | 55,303 | Al Leiter | Brad Halsey | Al Leiter | Brad Halsey | | 306 | 291 | 15 |
| 2004-06-27 | @ NYA | 73 | L 1-8 | 36-38 | 3 | 37,305 | Steve Trachsel | Jose Contreras | Jose Contreras | Steve Trachsel | Tom Gordon | 307 | 299 | 8 |
| 2004-06-27 | @ NYA | 74 | L 6-11 | 36-38 | 3 | 55,387 | Matt Ginter | Mike Mussina | Mike Mussina | Matt Ginter | | 313 | 310 | 3 |
| 2004-06-29 | @ CIN | 75 | W 7-5 | 37-38 | 3 | 27,858 | Jae Weong Seo | Todd Van Poppel | Jae Weong Seo | Todd Van Poppel | Braden Looper | 320 | 315 | 5 |
| 2004-06-30 | @ CIN | 76 | L 0-2 | 37-39 | 3 | 42,076 | Tom Glavine | Cory Lidle | Cory Lidle | Tom Glavine | Danny Graves | 320 | 317 | 3 |
| 2004-07-01 | @ CIN | 77 | W 7-6 | 38-39 | 3 | 31,633 | Al Leiter | Jose Acevedo | Al Leiter | Jose Acevedo | Braden Looper | 327 | 323 | 4 |
| 2004-07-02 | vs NYA | 78 | W 11-2 | 39-39 | 3 | 55,068 | Steve Trachsel | Mike Mussina | Steve Trachsel | Mike Mussina | | 338 | 325 | 13 |
| 2004-07-03 | vs NYA | 79 | W 10-9 | 40-39 | 2 | 55,120 | Matt Ginter | Jose Contreras | John Franco | Tanyon Sturtze | | 348 | 334 | 14 |
| 2004-07-04 | vs NYA | 80 | W 6-5 | 41-39 | 2 | 55,437 | Jae Weong Seo | Javier Vazquez | Orber Moreno | Tom Gordon | Braden Looper | 354 | 339 | 15 |
| 2004-07-05 | @ PHI | 81 | L 5-6 | 41-40 | 2 | 41,571 | Tom Glavine | Paul Abbott | Ryan Madson | Tom Glavine | Billy Wagner | 359 | 345 | 14 |
| 2004-07-06 | @ PHI | 82 | W 4-1 | 42-40 | 2 | 36,230 | Al Leiter | Randy Wolf | Al Leiter | Randy Wolf | Braden Looper | 363 | 346 | 17 |
| 2004-07-07 | @ PHI | 83 | W 10-1 | 43-40 | 2 | 37,687 | Steve Trachsel | Brett Myers | Steve Trachsel | Brett Myers | | 373 | 347 | 26 |
| 2004-07-08 | @ PHI | 84 | L 4-5 | 43-41 | 3 | 42,601 | Matt Ginter | Kevin Millwood | Billy Wagner | John Franco | | 377 | 352 | 25 |
| 2004-07-09 | @ FLO | 85 | W 6-3 | 44-41 | 2 | 25,117 | Jae Weong Seo | A.J. Burnett | Dan Wheeler | Josias Manzanillo | Braden Looper | 383 | 355 | 28 |
| 2004-07-10 | @ FLO | 86 | L 2-5 | 44-42 | 3 | 41,212 | Tom Glavine | Brad Penny | Brad Penny | Tom Glavine | Armando Benitez | 385 | 360 | 25 |
| 2004-07-11 | @ FLO | 87 | L 2-5 | 44-43 | 4 | 25,735 | Al Leiter | Dontrelle Willis | Dontrelle Willis | Al Leiter | Armando Benitez | 387 | 365 | 22 |
| 2004-07-15 | vs PHI | 88 | W 3-2 | 45-43 | 4 | 36,803 | Steve Trachsel | Eric Milton | Jose Parra | Roberto Hernandez | | 390 | 367 | 23 |
| 2004-07-16 | vs PHI | 89 | L 1-5 | 45-44 | 4 | 42,584 | Jae Weong Seo | Kevin Millwood | Kevin Millwood | Jae Weong Seo | Billy Wagner | 391 | 372 | 19 |
| 2004-07-17 | vs PHI | 90 | L 2-8 | 45-45 | 4 | 35,425 | Tom Glavine | Randy Wolf | Randy Wolf | Tom Glavine | | 393 | 380 | 13 |
| 2004-07-18 | vs PHI | 91 | W 6-1 | 46-45 | 3 | 30,443 | Al Leiter | Brett Myers | Al Leiter | Brett Myers | Braden Looper | 399 | 381 | 18 |
| 2004-07-19 | vs FLO | 92 | L 5-6 | 46-46 | 4 | 23,176 | Scott Erickson | Dontrelle Willis | Josias Manzanillo | Braden Looper | Armando Benitez | 404 | 387 | 17 |
| 2004-07-20 | vs FLO | 93 | L 7-9 | 46-47 | 4 | 25,295 | Steve Trachsel | Nate Bump | Ben Howard | John Franco | Armando Benitez | 411 | 396 | 15 |
| 2004-07-21 | vs MON | 94 | W 5-4 | 47-47 | 4 | 30,227 | Jae Weong Seo | John Patterson | Orber Moreno | Joe Horgan | Braden Looper | 416 | 400 | 16 |
| 2004-07-22 | vs MON | 95 | L 1-4 | 47-48 | 4 | 27,637 | Tom Glavine | Zach Day | Luis Ayala | John Franco | Chad Cordero | 417 | 404 | 13 |
| 2004-07-24 | vs ATL | 96 | L 2-5 | 47-49 | 4 | 33,166 | Al Leiter | John Thomson | John Thomson | Mike Stanton | John Smoltz | 419 | 409 | 10 |
| 2004-07-25 | vs ATL | 97 | L 3-4 | 47-50 | 4 | 32,542 | Steve Trachsel | Mike Hampton | Mike Hampton | Steve Trachsel | John Smoltz | 422 | 413 | 9 |
| 2004-07-26 | @ MON | 98 | L 10-19 | 47-51 | 4 | 6,643 | Scott Erickson | John Patterson | Luis Ayala | Scott Erickson | | 432 | 432 | 0 |
| 2004-07-27 | @ MON | 99 | W 4-2 | 48-51 | 4 | 7,147 | Tom Glavine | Zach Day | Tom Glavine | Zach Day | Braden Looper | 436 | 434 | 2 |
| 2004-07-28 | @ MON | 100 | L 4-7 | 48-52 | 4 | 6,852 | Jae Weong Seo | Tony Armas | T.J. Tucker | Jae Weong Seo | Chad Cordero | 440 | 441 | -1 |
| 2004-07-29 | @ MON | 101 | W 10-1 | 49-52 | 4 | 20,042 | Al Leiter | Rocky Biddle | Al Leiter | Rocky Biddle | | 450 | 442 | 8 |
| 2004-07-30 | @ ATL | 102 | L 1-3 | 49-53 | 4 | 40,913 | Steve Trachsel | Mike Hampton | Mike Hampton | Steve Trachsel | John Smoltz | 451 | 445 | 6 |
| 2004-07-31 | @ ATL | 103 | L 0-8 | 49-54 | 4 | 51,125 | Kris Benson | Jaret Wright | Jaret Wright | Kris Benson | | 451 | 453 | -2 |
| 2004-08-01 | @ ATL | 104 | L 5-6 | 49-55 | 4 | 34,203 | Tom Glavine | Paul Byrd | Paul Byrd | Tom Glavine | John Smoltz | 456 | 459 | -3 |
| 2004-08-03 | @ MIL | 105 | W 12-3 | 50-55 | 4 | 22,306 | Al Leiter | Chris Capuano | Al Leiter | Chris Capuano | | 468 | 462 | 6 |
| 2004-08-04 | @ MIL | 106 | W 6-5 | 51-55 | 4 | 18,196 | Steve Trachsel | Doug Davis | Pedro Feliciano | Mike Adams | Braden Looper | 474 | 467 | 7 |
| 2004-08-05 | @ MIL | 107 | W 11-6 | 52-55 | 4 | 32,225 | Victor Zambrano | Victor Santos | Victor Zambrano | Victor Santos | | 485 | 473 | 12 |
| 2004-08-06 | @ SLN | 108 | L 4-6 | 52-56 | 4 | 43,949 | Tom Glavine | Matt Morris | Matt Morris | Tom Glavine | Jason Isringhausen | 489 | 479 | 10 |
| 2004-08-07 | @ SLN | 109 | L 1-2 | 52-57 | 4 | 45,364 | Kris Benson | Woody Williams | Julian Tavarez | Mike Stanton | | 490 | 481 | 9 |
| 2004-08-08 | @ SLN | 110 | L 2-6 | 52-58 | 4 | 43,578 | Al Leiter | Jason Marquis | Jason Marquis | Al Leiter | Julian Tavarez | 492 | 487 | 5 |
| 2004-08-10 | vs HOU | 111 | W 7-3 | 53-58 | 4 | 28,472 | Steve Trachsel | Peter Munro | Steve Trachsel | Peter Munro | | 499 | 490 | 9 |
| 2004-08-11 | vs HOU | 112 | L 4-5 | 53-59 | 4 | 32,060 | Matt Ginter | Roy Oswalt | Brad Lidge | Braden Looper | Kirk Bullinger | 503 | 495 | 8 |
| 2004-08-12 | vs HOU | 113 | W 2-1 | 54-59 | 4 | 26,419 | Victor Zambrano | Andy Pettitte | Victor Zambrano | David Weathers | Braden Looper | 505 | 496 | 9 |
| 2004-08-13 | vs ARI | 114 | W 10-6 | 55-59 | 4 | 22,124 | Kris Benson | Casey Fossum | Kris Benson | Casey Fossum | | 515 | 502 | 13 |
| 2004-08-14 | vs ARI | 115 | W 4-3 | 56-59 | 4 | 37,599 | Al Leiter | Edgar Gonzalez | Al Leiter | Edgar Gonzalez | Braden Looper | 519 | 505 | 14 |
| 2004-08-15 | vs ARI | 116 | L 0-2 | 56-60 | 4 | 36,590 | Steve Trachsel | Randy Johnson | Randy Johnson | Steve Trachsel | Greg Aquino | 519 | 507 | 12 |
| 2004-08-17 | @ COL | 117 | L 4-6 | 56-61 | 4 | 34,387 | Victor Zambrano | Jason Jennings | Jason Jennings | Dan Wheeler | Shawn Chacon | 523 | 513 | 10 |
| 2004-08-19 | @ COL | 118 | W 10-3 | 58-61 | 4 | 30,827 | Kris Benson | Shawn Estes | Kris Benson | Shawn Estes | | 533 | 516 | 17 |
| 2004-08-19 | @ COL | 119 | W 4-2 | 58-61 | 4 | 29,918 | Al Leiter | Jeff Fassero | Mike Stanton | Steve Reed | | 537 | 518 | 19 |
| 2004-08-20 | @ SFN | 120 | L 3-7 | 58-62 | 4 | 42,211 | Steve Trachsel | Noah Lowry | Noah Lowry | Steve Trachsel | | 540 | 525 | 15 |
| 2004-08-21 | @ SFN | 121 | W 11-9 | 59-62 | 4 | 42,418 | Tom Glavine | Brett Tomko | Mike Stanton | Kevin Correia | Bartolome Fortunato | 551 | 534 | 17 |
| 2004-08-22 | @ SFN | 122 | L 1-3 | 59-63 | 4 | 42,359 | Matt Ginter | Kirk Rueter | Kirk Rueter | Matt Ginter | Dustin Hermanson | 552 | 537 | 15 |
| 2004-08-23 | vs SDN | 123 | L 4-9 | 59-64 | 4 | 25,475 | Aaron Heilman | Jake Peavy | Jake Peavy | Aaron Heilman | | 556 | 546 | 10 |
| 2004-08-24 | vs SDN | 124 | L 1-3 | 59-65 | 4 | 25,558 | Kris Benson | David Wells | David Wells | Kris Benson | Trevor Hoffman | 557 | 549 | 8 |
| 2004-08-25 | vs SDN | 125 | L 0-4 | 59-66 | 4 | 28,067 | Al Leiter | Brian Lawrence | Brian Lawrence | Al Leiter | | 557 | 553 | 4 |
| 2004-08-26 | vs SDN | 126 | L 3-10 | 59-67 | 4 | 27,621 | Steve Trachsel | Adam Eaton | Adam Eaton | Steve Trachsel | | 560 | 563 | -3 |
| 2004-08-27 | vs LAN | 127 | W 9-2 | 60-67 | 4 | 42,694 | Tom Glavine | Wilson Alvarez | Tom Glavine | Wilson Alvarez | | 569 | 565 | 4 |
| 2004-08-28 | vs LAN | 128 | L 2-4 | 60-68 | 4 | 40,660 | Jae Weong Seo | Odalis Perez | Giovanni Carrara | Mike Stanton | Eric Gagne | 571 | 569 | 2 |
| 2004-08-29 | vs LAN | 129 | L 2-10 | 60-69 | 4 | 33,582 | Kris Benson | Kazuhisa Ishii | Kazuhisa Ishii | Kris Benson | | 573 | 579 | -6 |
| 2004-08-30 | vs FLO | 130 | L 4-6 | 60-70 | 4 | 16,468 | Al Leiter | Dontrelle Willis | Rudy Seanez | Heath Bell | Armando Benitez | 577 | 585 | -8 |
| 2004-08-31 | vs FLO | 131 | L 0-5 | 60-71 | 4 | 17,770 | Steve Trachsel | Josh Beckett | Josh Beckett | Steve Trachsel | | 577 | 590 | -13 |
| 2004-09-01 | vs FLO | 132 | L 4-5 | 60-72 | 4 | 19,621 | Tom Glavine | Ismael Valdez | Ismael Valdez | Tom Glavine | Armando Benitez | 581 | 595 | -14 |
| 2004-09-02 | vs FLO | 133 | L 6-9 | 60-73 | 4 | 24,937 | Jae Weong Seo | Carl Pavano | Carl Pavano | Jae Weong Seo | | 587 | 604 | -17 |
| 2004-09-03 | @ PHI | 134 | L 1-8 | 60-74 | 4 | 37,267 | Matt Ginter | Gavin Floyd | Gavin Floyd | Heath Bell | | 588 | 612 | -24 |
| 2004-09-04 | @ PHI | 135 | L 0-7 | 60-75 | 4 | 43,089 | Al Leiter | Cory Lidle | Cory Lidle | Al Leiter | | 588 | 619 | -31 |
| 2004-09-05 | @ PHI | 136 | L 2-4 | 60-76 | 4 | 43,628 | Steve Trachsel | Brett Myers | Brett Myers | Steve Trachsel | Tim Worrell | 590 | 623 | -33 |
| 2004-09-07 | @ FLO | 137 | L 3-7 | 60-77 | 4 | 14,308 | Tom Glavine | A.J. Burnett | A.J. Burnett | Tom Glavine | | 593 | 630 | -37 |
| 2004-09-08 | @ FLO | 138 | L 0-3 | 60-78 | 4 | 14,691 | Jae Weong Seo | Josh Beckett | Josh Beckett | Jae Weong Seo | Armando Benitez | 593 | 633 | -40 |
| 2004-09-09 | @ FLO | 139 | W 4-0 | 61-78 | 4 | 13,102 | Kris Benson | Ismael Valdez | Kris Benson | Ismael Valdez | | 597 | 633 | -36 |
| 2004-09-10 | vs PHI | 140 | L 5-9 | 61-79 | 4 | 27,827 | Al Leiter | Brett Myers | Todd Jones | Ricky Bottalico | | 602 | 642 | -40 |
| 2004-09-11 | vs PHI | 141 | L 9-11 | 61-80 | 4 | 21,718 | Steve Trachsel | Eric Milton | Roberto Hernandez | Vic Darensbourg | Felix Rodriguez | 611 | 653 | -42 |
| 2004-09-12 | vs PHI | 142 | L 2-4 | 61-81 | 4 | 23,391 | Tom Glavine | Vicente Padilla | Vicente Padilla | Tom Glavine | Tim Worrell | 613 | 657 | -44 |
| 2004-09-13 | vs ATL | 143 | W 9-7 | 62-82 | 4 | 0 | Aaron Heilman | Jaret Wright | Aaron Heilman | Jaret Wright | | 622 | 664 | -42 |
| 2004-09-13 | vs ATL | 144 | L 1-7 | 62-82 | 4 | 21,476 | Jae Weong Seo | Paul Byrd | Paul Byrd | Jae Weong Seo | | 623 | 671 | -48 |
| 2004-09-14 | vs ATL | 145 | W 7-0 | 63-82 | 4 | 21,545 | Kris Benson | Russ Ortiz | Kris Benson | Russ Ortiz | | 630 | 671 | -41 |
| 2004-09-15 | vs ATL | 146 | L 0-2 | 63-83 | 4 | 29,704 | Al Leiter | John Thomson | John Thomson | Al Leiter | John Smoltz | 630 | 673 | -43 |
| 2004-09-16 | vs ATL | 147 | W 9-4 | 64-83 | 4 | 19,885 | Steve Trachsel | Jose Capellan | Steve Trachsel | Jose Capellan | | 639 | 677 | -38 |
| 2004-09-18 | @ PIT | 148 | W 8-7 | 65-83 | 4 | 19,236 | Tom Glavine | John Van Benschoten | Tyler Yates | Salomon Torres | Braden Looper | 647 | 684 | -37 |
| 2004-09-19 | @ PIT | 149 | L 0-1 | 65-85 | 4 | 0 | Aaron Heilman | Ryan Vogelsong | Ryan Vogelsong | Aaron Heilman | Jose Mesa | 647 | 685 | -38 |
| 2004-09-19 | @ PIT | 150 | L 1-6 | 65-85 | 4 | 18,219 | Kris Benson | David Williams | David Williams | Kris Benson | | 648 | 691 | -43 |
| 2004-09-21 | @ MON | 151 | L 1-6 | 65-86 | 4 | 3,839 | Al Leiter | Livan Hernandez | Livan Hernandez | Al Leiter | | 649 | 697 | -48 |
| 2004-09-22 | @ MON | 152 | W 3-2 | 66-86 | 4 | 3,664 | Steve Trachsel | John Patterson | Bartolome Fortunato | Luis Ayala | Braden Looper | 652 | 699 | -47 |
| 2004-09-23 | @ MON | 153 | W 4-2 | 67-86 | 4 | 11,142 | Tom Glavine | Tomo Ohka | Tom Glavine | Tomo Ohka | Braden Looper | 656 | 701 | -45 |
| 2004-09-24 | vs CHN | 154 | L 1-2 | 67-87 | 4 | 28,196 | Kris Benson | Glendon Rusch | Mike Remlinger | Braden Looper | LaTroy Hawkins | 657 | 703 | -46 |
| 2004-09-25 | vs CHN | 155 | W 4-3 | 68-87 | 4 | 34,284 | Aaron Heilman | Mark Prior | Jae Weong Seo | Kent Mercker | | 661 | 706 | -45 |
| 2004-09-26 | vs CHN | 156 | W 3-2 | 69-87 | 4 | 36,476 | Al Leiter | Kerry Wood | Al Leiter | Kerry Wood | Braden Looper | 664 | 708 | -44 |
| 2004-09-28 | @ ATL | 157 | W 2-1 | 70-88 | 4 | 0 | Steve Trachsel | Paul Byrd | Steve Trachsel | Paul Byrd | Braden Looper | 666 | 709 | -43 |
| 2004-09-28 | @ ATL | 158 | L 2-5 | 70-88 | 4 | 35,729 | Tom Glavine | Jaret Wright | Roman Colon | Tom Glavine | John Smoltz | 668 | 714 | -46 |
| 2004-09-29 | @ ATL | 159 | L 3-6 | 70-89 | 4 | 22,000 | Aaron Heilman | Russ Ortiz | Russ Ortiz | Aaron Heilman | John Smoltz | 671 | 720 | -49 |
| 2004-10-01 | vs MON | 160 | L 2-4 | 70-90 | 4 | 29,273 | Kris Benson | Scott Downs | Jon Rauch | Pedro Feliciano | Chad Cordero | 673 | 724 | -51 |
| 2004-10-02 | vs MON | 161 | L 3-6 | 70-91 | 4 | 30,147 | Al Leiter | Livan Hernandez | Chad Cordero | Braden Looper | Gary Majewski | 676 | 730 | -54 |
| 2004-10-03 | vs MON | 162 | W 8-1 | 71-91 | 4 | 33,569 | Tom Glavine | John Patterson | Tom Glavine | John Patterson | | 684 | 731 | -47 |