John Davidson trades
| Boston Bruins acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
 | David Warsofsky | June 26, 2010 | Vladimir Sobotka |  |
| St. Louis Blues acquire | Date | Ottawa Senators acquire | ||
|---|---|---|---|---|
| 2010 1st round pick (#16-Vladimir Tarasenko) | June 25, 2010 | David Rundblad |  |
| St. Louis Blues acquire | Date | Colorado Avalanche acquire | ||
|---|---|---|---|---|
| T.J. Hensick | June 17, 2010 | Julian Talbot |  |
| Montreal Canadiens acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
 | Lars Eller | June 17, 2010 | Jaroslav Halak | |
| Ian Schultz | ||||
| Vancouver Canucks acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
 | Yan Stastny | March 3, 2010 | Pierre-Cedric Labrie | |
| Montreal Canadiens acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
| Aaron Palushaj | March 2, 2010 | Matt D`Agostini | |
| St. Louis Blues acquire | Date | Chicago Blackhawks acquire | ||
|---|---|---|---|---|
| Daryl Boyle | March 1, 2010 | Danny Richmond |  |
| Joe Fallon | Hannu Toivonen | |||
| St. Louis Blues acquire | Date | Pittsburgh Penguins acquire | ||
|---|---|---|---|---|
| Nate Guenin | February 11, 2010 | Steve Wagner |  |
| St. Louis Blues acquire | Date | Columbus Blue Jackets acquire | ||
|---|---|---|---|---|
| Pascal Pelletier | December 8, 2009 | Brendan Bell |  |
| Tomas Kana | ||||
| St. Louis Blues acquire | Date | Nashville Predators acquire | ||
|---|---|---|---|---|
| 2009 7th round pick (#201-Maxwell Tardy) | June 27, 2009 | 2010 7th round pick (#194-David Elsner) |  |
| St. Louis Blues acquire | Date | Pittsburgh Penguins acquire | ||
|---|---|---|---|---|
| Danny Richmond | March 4, 2009 | Andy Wozniewski | |
| St. Louis Blues acquire | Date | Pittsburgh Penguins acquire | ||
|---|---|---|---|---|
| Jonathan Filewich | December 19, 2008 | 2010 conditional 6th round pick (not exercised) | |
| Toronto Maple Leafs acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
 | Lee Stempniak | November 24, 2008 | Carlo Colaiacovo | |
| Alexander Steen | ||||
| Los Angeles Kings acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
 | 2009 7th round pick (#197-Nic Dowd) | June 21, 2008 | 2008 7th round pick (#185-Paul Karpowich) | |
| St. Louis Blues acquire | Date | Nashville Predators acquire | ||
|---|---|---|---|---|
| Chris Mason | June 20, 2008 | 2008 4th round pick (#111-Dale Weise) | |
| Toronto Maple Leafs acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
| Jamal Mayers | June 19, 2008 | 2008 3rd round pick (#70-James Livingston) | |
| Los Angeles Kings acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
| 2009 5th round pick (#137-Wade Megan) | June 4, 2008 | T.J. Fast | |
| New Jersey Devils acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
 | Bryce Salvador | February 26, 2008 | Cam Janssen | |
| St. Louis Blues acquire | Date | New York Rangers acquire | ||
|---|---|---|---|---|
| 2008 4th round pick (#111-Dale Weise) | February 26, 2008 | Christian Backman |  |
| Anaheim Ducks acquire | Date | St. Louis Blues acquire | ||
|---|---|---|---|---|
 | Doug Weight | December 14, 2007 | Andy McDonald | |
| 2008 7th round pick (#185-Paul Karpowich) | ||||
| Michal Birner | ||||