June 23, 2017, at the 2017 NHL Entry Draft, Schenn waxaa lagu kala iibsaday Flyers ilaa St. Louis Blues iyada oo lagu beddelay Jori Lehtera, 2017 wareega koowaad (27aad guud ahaan) iyo shuruud 2018
xulashada wareega koowaad. Xilli ciyaareedkiisii ugu horreeyay ee Blues, Schenn ayaa ka soo baxay oo dhigay xirfad sare ee dhibcaha, caawinta, iyo goolalka. Wuxuu diiwaan geliyey hat-trickkiisii saddexaad ee xirfadiisa December 5, 2017, guushii 4-3 ee Montreal Canadiens wuxuuna hogaamiyay Saddexda Xiddig ee Toddobaadka. Bishii xigtay, Schenn waxaa loogu magac daray 2018 National Hockey League All-Star Game ka dib markii uu duubay 42 dhibcood 32 kulan. Wuxuu xilli ciyaareedkii ku dhammeeyay 70 dhibcood 82 kulan.