In mid-February, Seattle Youth Soccer Association and Seattle United established a migration process for older SYSA select teams to voluntarily come across from their existing host club to Seattle United. Since then, a number of teams have petitioned to join Seattle United and have been accepted (see below).
Note: All migrations still require competitive tryouts and the citywide team coach assignments are determined by the Seattle United Coaching Director.
| Age | Current Club | Curent Team | New Team | Seattle United Coach |
|---|---|---|---|---|
| BU15 | FC Shoreline | Surge | SU/Shoreline M95 Bue (Surge) | Bill Keebler |
| BU16 | Emerald City FC | M94 Green* | Seattle United M94 Copa | Tommy Jenkins |
| BU16 | Emerald City FC | M94 White* | Seattle United M94 Tango | Alex Chursky |
| BU16 | FC Shoreline | Riptide | SU/Shoreline M94 Blue (Riptide) | DJ Yasui |
| BU16 | Ballard | Chili Peppers | Seattle United M94 Blue (Chili Peppers) | Andrew Westmark |
| BU18 | Emerald City FC | M92 Green | Seattle United M92 Copa | Peter Fewing |
| BU18 | Emerald City FC | M92 White | Seattle United M92 Tango | John Hamel |
| BU18 | FC Shoreline | Pumas | SU/Shoreline M92 Blue (Pumas) | Bill Wilkins |
| BU18 | LVR | Hornets | Seattle United M92 Blue (Hornets) | Craig Walker |
| GU15 | Emerald City FC | F95 Green | Seattle United F95 Copa | Laura Caldwell |
| GU15 | FC Shoreline | Sapphires | SU/Shoreline F95 Blue (Sapphires) | Bill Wilkins |
| GU15 | FC Shoreline | Ice | SU/Shoreline F95 Blue (Ice) | Kim Huntamer |
| GU15 | Mt Baker | Blue Cats Utd | Seattle United F95 Blue (Blue Cats) | TBA |
| GU16 | FC Shoreline | Shock | SU/Shoreline F94 Blue (Shock) | Mark Galindo |
| GU16 | Ballard | Rudies | Seattle United F94 Blue (Rudies) | Jeff Nissen |
| GU17 | Emerald City FC | F93 Green | Seattle United F93 Copa | Shawn Farrell |
| GU17 | Lake City | G93 Mets | Seattle United NE F93 Blue (Mets) | Holly Krejci |
| GU18 | Emerald City FC | F92 Green | Seattle United F92 Copa | Richard Reece |
| GU18 | Emerald City FC | F92 White | Seattle United F92 Tango | Brandon Mitalas |
* These teams did not complete the team migration application but during the competitive Seattle United tryout process met the standard criteria of eight (8) returning players to be considered a migrated team.