| 5. Journée | 21.07.2018 | Seattle Sounders | - | Vancouver Whitecaps | 2:0 | ||||
| 5. Journée | 26.07.2018 | San Jose Earthquakes | - | Seattle Sounders | 0:1 |  |
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| 5. Journée | 29.07.2018 | Seattle Sounders | - | New York City FC | 3:1 | ||||
| 6. Journée | 05.08.2018 | Minnesota United FC | - | Seattle Sounders | 1:2 | ||||
| 6. Journée | 13.08.2018 | Seattle Sounders | - | FC Dallas | 2:1 | ||||
| 6. Journée | 18.08.2018 | Seattle Sounders | - | Los Angeles Galaxy | 5:0 | |
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| 6. Journée | 27.08.2018 | Portland Timbers | - | Seattle Sounders | 0:1 | ||||
| 7. Journée | 01.09.2018 | Seattle Sounders | - | Sporting Kansas City | 3:1 | |
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| 7. Journée | 16.09.2018 | Vancouver Whitecaps | - | Seattle Sounders | 1:2 | |
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| 7. Journée | 20.09.2018 | Seattle Sounders | - | Philadelphia Union | 0:1 | ||||
| 7. Journée | 24.09.2018 | Los Angeles Galaxy | - | Seattle Sounders | 3:0 | ||||
| 7. Journée | 29.09.2018 | Seattle Sounders | - | Colorado Rapids | 4:0 | |
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| 8. Journée | 21.10.2018 | Houston Dynamo | - | Seattle Sounders | 2:3 | |
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| 8. Journée | 28.10.2018 | Seattle Sounders | - | San Jose Earthquakes | 2:1 | |
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