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| 2 MLS Cup championship seasons: 2016, 2019 |
| Last MLS Cup championship: 2019, 4 seasons ago |
| Best finish: |
| beat Toronto in MLS Cup Finals in 2016 |
| beat Toronto in MLS Cup Finals in 2019 |
| TEAM | SEASON | RECORD | PTS | DIV STAND | PLAYOFFS |
| Seattle | 2009 | 12-7-11 | 47 pts | 3rd West Conf | LHou |
| Seattle | 2010 | 14-10-6 | 48 pts | 4th West Conf | LLA |
| Seattle | 2011 | 18-7-9 | 63 pts | 2nd West Conf | bye LRSL |
| Seattle | 2012 | 15-8-11 | 56 pts | 3rd West Conf | bye WRSL LLA |
| Seattle | 2013 | 15-12-7 | 52 pts | 4th West Conf | WCol LPor |
| Seattle | 2014 | 20-10-4 | 64 pts | 1st West Conf | bye WDal LLA |
| Seattle | 2015 | 15-13-6 | 51 pts | 4th West Conf | WLA LDal |
| %Seattle | 2016 | 14-14-6 | 48 pts | 4th West Conf | WKC WDal WCol WTor |
| Seattle | 2017 | 14-9-11 | 53 pts | 2nd West Conf | bye WVan WHou LTor |
| Seattle | 2018 | 18-11-5 | 59 pts | 2nd West Conf | bye LPor |
| %Seattle | 2019 | 16-10-8 | 56 pts | 2nd West Conf | WDal WRSL WLAF WTor |
| Seattle | 2020 | 11-5-6 | 39 pts | 2nd West Conf | WLAF WDal WMin LCbs |
| Seattle | 2021 | 17-8-9 | 60 pts | 2nd West Conf | LRSL |
| Seattle | 2022 | 12-17-5 | 41 pts | 11th West Conf | missed playoffs |
| Seattle | 2023 | 14-9-11 | 53 pts | 2nd West Conf | WDal LLAF |