| | D | Signed (The St. Louis Blues signed D Ryan Suter.) |
| | LW | Signed (The St. Louis Blues signed F Pavel Buchnevich.) |
| | RW | Traded (The Ottawa Senators traded F Mathieu Joseph to the St. Louis Blues.) From |
| | D | Signed (The St. Louis Blues signed D Pierre-Olivier Joseph.) |
| | C | Traded (The Dallas Stars traded F Radek Faksa to the St. Louis Blues.) From |
| | D | Signed (The St. Louis Blues signed D Adam Jiricek to a three-year, entry-level contract.) |
| | RW | Signed (The St. Louis Blues signed F Kasperi Kapanen to a standard contact.) |
| | D | Signed (The St. Louis Blues signed D Corey Schueneman to a two-way contract.) |
| | D | Signed (The St. Louis Blues signed D Hunter Skinner to a standard contract.) |
| | RW | Became Unrestricted Free Agent (F Kasperi Kapanen elected free agency.) |
| | LW | Became Unrestricted Free Agent (F Sammy Blais elected free agency.) |
| | D | Became Unrestricted Free Agent (D Josh Jacobs elected free agency.) |
| | D | Became Unrestricted Free Agent (D Calle Rosen elected free agency.) |
| | D | Drafted (The St. Louis Blues drafted D William McIsaac) |
| | D | Drafted (The St. Louis Blues drafted D Colin Ralph) |
| | C | Drafted (The St. Louis Blues drafted C Adam Jecho) |
| | C | Drafted (The St. Louis Blues drafted F Matvei Korotky.) |
| | LW | Drafted (The St. Louis Blues drafted LW Ondrej Kos) |
| | C | Became Unrestricted Free Agent (F Matthew Peca elected free agency.) |
| | C | Traded (The St. Louis Blues traded F Kevin Hayes to the Pittsburgh Penguins) To |
| | D | Drafted (The St. Louis Blues drafted D Lukas Fischer) |
| | C | Drafted (The St. Louis Blues drafted C Tomas Mrsic) |
| | LW | Became Unrestricted Free Agent (F Jakub Vrana elected free agency.) |
| | D | Became Unrestricted Free Agent (D Wyatt Kalynuk elected free agency.) |
| | C | Drafted (The St. Louis Blues drafted F Antoine Dorion.) |
| | D | Became Unrestricted Free Agent (D Marco Scandella elected free agency.) |
| | D | Drafted (The St. Louis Blues drafted D Adam Jiricek) |
| | C | Traded (The Columbus Blue Jackets traded F Alexandre Texier to the St. Loius Blues.) From |
| | D | Contract extended (The St. Louis Blues signed D Scott Perunovich to a contract extension.) |
| | G | Contract extended (The St. Louis Blues signed G Colten Ellis to a one-year, two-way contract extension.) |
| | RW | Contract extended (The St. Louis Blues signed F Mathias Laferriere to a one-year, two-way contract extension.) |
| | LW | Signed (The St. Louis Blues signed F Juraj Pekarcik to an entry-level contract.) |
| | C | Signed (The St. Louis Blues signed F Aleksanteri Kaskimaki to a three-year, two-way entry-level contract.) |
| | LW | Contract extended (The St. Louis Blues signed F Hugh McGing to a two-year, two-way contract extension.) |
| | C | Signed (The St. Louis Blues signed F Otto Stenberg to an entry-level contract. ) |
| | D | Signed (The St. Louis Blues signed D Theo Lindstein to a three-year, entry-level contract.) |
| | C | Signed (The St Louis Blues signed F Otto Stenberg to a three-year, entry-level contract.) |
| | RW | Signed (The St. Louis Blues signed F Simon Robertsson to a three-year, two-way entry-level contract.) |
| | RW | Signed (The St. Louis Blues signed F Marcus Sylvegard to a one-year, entry-level contract.) |
| | D | Signed (The St. Louis Blues signed D Samuel Johannesson to a two-year, entry-level contract.) |
| | C | Sent to minors (The St. Louis Blues assigned F Zack Bolduc to the minors.) |
| | C | Sent to minors (The St. Louis Blues sent F Zach Dean to the minors.) |
| | D | Sent to minors (The St. Louis Blues assigned D Matthew Kessel to the minors.) |
| | C | Called up from minors (The St. Louis Blues recalled F Zach Dean from the minors.) |
| | D | Called up from minors (The St. Louis Blues recalled D Matthew Kessel from the minors.) |
| | D | Activated (The St. Louis Blues activated D Justin Faulk.) |
| | D | Sent to minors (The St. Louis Blues assigned D Matthew Kessel to the minors.) |
| | D | Activated (The St. Louis Blues activated D Scot Perunovich.) |
| | D | Sent to minors (The St. Louis Blues assigned D Calle Rosen to the minors.) |
| | D | Placed on Injured Reserve (The St. Louis Blues placed D Scott Perunovich on injured reserve.) |
| | D | Called up from minors (The St. Louis Blues recalled D Calle Rosen from the minors.) |
| | D | Called up from minors (The St. Louis Blues recalled D Calle Rosen from the minors.) |
| | RW | Activated (The St. Louis Blues activated F Kasperi Kapanen.) |
| | D | Placed on Injured Reserve (The St. Louis Blues placed D Justin Faulk on Injured Reserve.) |
| | C | Sent to minors (The St. Louis Blues sent F Adam Gaudette to the minors.) |
| | D | Called up from minors (The St. Louis Blues recalled D Tyler Tucker from the minors.) |
| | D | Called up from minors (The St. Louis Blues recalled D Tyler Tucker from the minors.) |
| | C | Called up from minors (The St. Louis Blues recalled F Adam Gaudette.) |
| | RW | Placed on Injured Reserve (The St. Louis Blues placed F Kasperi Kapanen on Injured Reserve.) |
| | C | Called up from minors (The St. Louis Blues recalled F Nikita Alexandrov.) |
| | D | Sent to minors (The St. Louis Blues assigned D Tyler Tucker to the minors.) |
| | LW | Sent to minors (The St. Louis Blues assigned F Jakub Vrana to the minors.) |
| | D | Activated (The St. Louis Blues activated D Justin Faulk.) |
| | LW | Called up from minors (The St. Louis Blues recalled F Jakub Vrana from the minors.) |
| | D | Placed on Injured Reserve (The St. Louis Blues placed D Justin Faulk on Injured Reserve.) |
| | C | Sent to minors (The St. Louis Blues assigned F Nikita Alexandrov to the minors.) |
| | LW | Called up from minors (The St. Louis Blues recalled F Nathan Walker.) |
| | LW | Sent to minors (The St. Louis Blues assigned F Mackenzie MacEachern to the minors.) |
| | D | Called up from minors (The St.Louis Blues recalled D Matt Kessel from the minors.) |
| | LW | Called up from minors (The St. Louis Blues recalled F Mackenzie MacEachern.) |
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