Transfers |
| Date | Player | Team From | Team To | Comments |
| 9/1/2018 | David Norman | Vancouver | Queen of the South | Loan |
| Major League Soccer | Scotland Championship | Loan until end of season | ||
| 8/28/2018 | Eryk Williamson | Portland | Santa Clara | Loan |
| Major League Soccer | Portugal Liga | |||
| 8/20/2018 | Joao Pedro | Los Angeles | Apollon Smyrni | Loan |
| Major League Soccer | Greece Super League | Loan until end of season | ||
| 8/16/2018 | Carlos Ascues | FBC Melgar | Orlando City SC | Loan |
| Peru Primera Division | Major League Soccer | Loaned until end of season | ||
| 8/10/2018 | Mohammed Abu | Columbus | Valerenga | Loan |
| Major League Soccer | Norway Eliteserien | Half season loan | ||
| 8/8/2018 | Brad Smith | Bournemouth | Seattle | Loan |
| English Premier League | Major League Soccer | Loan until end of season | ||
| 8/8/2018 | Lucas Janson | Tigre | Toronto FC | Loan |
| Argentina Primera A | Major League Soccer | Loan until end of 2018 | ||
| 8/8/2018 | Bill Hamid | Midtjylland | D.C. | Loan |
| Denmark Superliga | Major League Soccer | Loaned until end of 2019 | ||
| 8/8/2018 | Jorge Villafana | Santos | Portland | Transfer |
| Liga MX | Major League Soccer | Undisclosed | ||
| 8/8/2018 | Josh Pérez | Fiorentina | Los Angeles FC | Transfer |
| Italy Serie A | Major League Soccer | Undisclosed | ||
| 8/3/2018 | Danilo Silva | Internacional | Los Angeles FC | Loan |
| Brazil Serie A | Major League Soccer | Half season loan | ||
| 8/3/2018 | Michael Mancienne | Nottingham Forest | New England | Transfer |
| England Championship | Major League Soccer | Undisclosed | ||
| 7/24/2018 | Pablo Aranguiz | Union Española | FC Dallas | Transfer |
| Chile Primera Division | Major League Soccer | Undisclosed | ||
| 7/23/2018 | Cristhian Machado | Jorge Wilstermann | New England | Transfer |
| Bolivia LFPB | Major League Soccer | Undisclosed | ||
| 7/17/2018 | Tomás Conechny | San Lorenzo | Portland | Loan |
| Argentina Primera A | Major League Soccer | |||
| 7/12/2018 | Nicolas Del Grecco | C.D. Olimpia | Chicago | Transfer |
| CONCACAF Champions League | Major League Soccer | Undisclosed | ||
| 7/11/2018 | Aleksandar Katai | Alavés | Chicago | Transfer |
| Liga Santander | Major League Soccer | Undisclosed | ||
| 7/10/2018 | André Horta | Benfica | Los Angeles FC | Transfer |
| Portugal Liga | Major League Soccer | Undisclosed | ||
| 7/5/2018 | Ronaldo Peña | Moreirense | Houston | Transfer |
| Portugal Liga | Major League Soccer | Free transfer using TAM | ||
| 7/1/2018 | Eric Remedi | Banfield | Atlanta | Transfer |
| Argentina Primera A | Major League Soccer | Undisclosed fee | ||
| 7/1/2018 | Guram Kashia | Vitesse | San Jose | Transfer |
| Dutch Eredivisie | Major League Soccer | Undisclosed | ||
| 7/1/2018 | Shane O'Neill | Excelsior | Orlando City SC | Transfer |
| Dutch Eredivisie | Major League Soccer | Free | ||
| 5/1/2018 | Adama Diomande | Hull City | Los Angeles FC | Transfer |
| England Championship | Major League Soccer | Undisclosed | ||
| 4/23/2018 | Nicolás Czornomaz | Defensa y Justicia | Los Angeles | Transfer |
| Argentina Primera A | Major League Soccer | |||
| 4/11/2018 | Edwin Gómez | Universitario | Minnesota | Loan |
| Peru Primera Division | Major League Soccer | Loaned until end of 2018 season | ||
| 3/31/2018 | Darwin Quintero | América | Minnesota | Transfer |
| Liga MX | Major League Soccer | |||
| 3/19/2018 | Alejandro Silva | Lanús | Montreal | Transfer |
| Argentina Primera A | Major League Soccer | Undisclosed fee | ||
| 3/8/2018 | Luis Caicedo | Cortuluá | New England | Loan |
| Colombia Primera B | Major League Soccer | Loan until end of 2018 season | ||
| 3/2/2018 | Jordon Mutch | Crystal Palace | Vancouver | Loan |
| English Premier League | Major League Soccer | |||
| 2/28/2018 | Borek Dockal | Henan Jianye | Philadelphia | Loan |
| Chinese Super League | Major League Soccer | Loaned for the 2018 Season as a DP | ||
| 2/22/2018 | Maximiano | Fluminense | Minnesota | Loan |
| Brazil Serie A | Major League Soccer | Undisclosed fee | ||
| 2/13/2018 | Yamil Asad | Vélez Sarsfield | D.C. | Transfer |
| Argentina Primera A | Major League Soccer | Undisclosed fee | ||
| 2/12/2018 | Santiago Mosquera | Millonarios | FC Dallas | Transfer |
| Colombia Primera Liga | Major League Soccer | Undisclosed | ||
| 2/9/2018 | Samuel Armenteros | Benevento | Portland | Loan |
| Italy Serie A | Major League Soccer | Loan | ||
| 2/7/2018 | Damir Kreilach | 1. FC Union Berlin | Real Salt Lake | Transfer |
| Germany Bundesliga 2 | Major League Soccer | Undisclosed | ||
| 2/6/2018 | Aleksandar Katai | Alavés | Chicago | Loan |
| Liga Santander | Major League Soccer | Loan until end of season | ||
| 2/1/2018 | Gregory van der Wiel | Cagliari | Toronto FC | Transfer |
| Italy Serie A | Major League Soccer | Undisclosed | ||
| 1/31/2018 | Marc Rzatkowski | Red Bull Salzburg | New York | Loan |
| Austria Bundesliga | Major League Soccer | Loan until end of 2017/18 season | ||
| 1/31/2018 | Johnny Russell | Derby County | Sporting Kansas City | Transfer |
| England Championship | Major League Soccer | Signed 3yr contract | ||
| 1/31/2018 | Oriol Rosell | Sporting CP | Orlando City SC | Transfer |
| Portugal Liga | Major League Soccer | 500.000$ | ||
| 1/29/2018 | Danny Wilson | Rangers | Colorado | Transfer |
| Scotland Premiership | Major League Soccer | Undisclosed Fee | ||
| 1/24/2018 | Olmes García | Real Salt Lake | Oviedo | Loan |
| Major League Soccer | Liga 1, 2, 3 | Loan until end of season | ||
| 1/23/2018 | Aaron Kovar | Seattle | Los Angeles FC | Loan |
| Major League Soccer | Major League Soccer | Option to buy end of 2018 | ||
| 1/23/2018 | Cristian Penilla | Pachuca | New England | Loan |
| Liga MX | Major League Soccer | |||
| 1/22/2018 | Tommy Smith | Ipswich Town | Colorado | Transfer |
| England Championship | Major League Soccer | 1.50 M | ||
| 1/22/2018 | Saphir Taider | Bologna | Montreal | Transfer |
| Italy Serie A | Major League Soccer | Undisclosed | ||
| 1/18/2018 | Emiliano Amor | Vélez Sarsfield | Sporting Kansas City | Loan |
| Argentina Primera A | Major League Soccer | 1yr loan option to buy at end of 2018 | ||
| 1/18/2018 | Efraín Juárez | Monterrey | Vancouver | Transfer |
| Liga MX | Major League Soccer | Undisclosed | ||
| 1/18/2018 | Michael Petrasso | Queens Park Rangers | Montreal | Transfer |
| England Championship | Major League Soccer | Undisclosed Fee | ||
| 1/18/2018 | Zakaria Diallo | Brest | Montreal | Transfer |
| France Ligue 2 | Major League Soccer | Free | ||
| 1/17/2018 | Andy Polo | Morelia | Portland | Loan |
| Liga MX | Major League Soccer | Loaned for 2018 Season | ||
| 1/16/2018 | Alejandro Fuenmayor | Carabobo FC | Houston | Transfer |
| Venezuela Primera Division | Major League Soccer | Undisclosed fee | ||
| 1/12/2018 | Jack Price | Wolverhampton | Colorado | Transfer |
| England Championship | Major League Soccer | Undisclosed Fee | ||
| 1/12/2018 | Ismael Tajouri | Austria Wien | New York City FC | Transfer |
| Austria Bundesliga | Major League Soccer | Undisclosed | ||
| 1/10/2018 | Amando Moreno | Tijuana | New York | Transfer |
| Liga MX | Major League Soccer | Undisclosed | ||
| 1/9/2018 | Edgar Castillo | Monterrey | Colorado | Loan |
| Liga MX | Major League Soccer | Loan until end of 2017/18 season | ||
| 1/9/2018 | Perry Kitchen | Randers | Los Angeles | Transfer |
| Denmark Superliga | Major League Soccer | Undisclosed | ||
| 1/2/2018 | Reto Ziegler | FC Luzern | FC Dallas | Transfer |
| Switzerland Super League | Major League Soccer | |||
| 1/1/2018 | Omar Gaber | FC Basel | Los Angeles FC | Loan |
| Switzerland Super League | Major League Soccer | Loan until end of 2017/18 season | ||
| 1/1/2018 | Rolf Feltscher | Cardiff City | Los Angeles | Transfer |
| England Championship | Major League Soccer | Free | ||
| 1/1/2018 | Carlos Vela | Real Sociedad | Los Angeles FC | Transfer |
| Liga Santander | Major League Soccer | Undisclosed | ||
| 1/1/2018 | Franco Escobar | Newell's Old Boys | Atlanta | Transfer |
| Argentina Primera A | Major League Soccer | |||
| 1/1/2018 | Ezequiel Barco | Independiente | Atlanta | Transfer |
| Argentina Primera A | Major League Soccer | Undisclosed fee | ||
| 1/1/2018 | Alejandro Romero Gamarra | Huracán | New York | Transfer |
| Argentina Primera A | Major League Soccer | Undisclosed fee | ||
| 1/1/2018 | Danny Hoesen | FC Groningen | San Jose | Transfer |
| Dutch Eredivisie | Major League Soccer | Permanent deal | ||
| 1/1/2018 | Johan Blomberg | AIK | Colorado | Transfer |
| Sweden Allsvenskan | Major League Soccer | Free |