Other hockey leagues in 1904:    
FHL  ·  CAHL  ·  WPHL
Stanley Chall.
Stanley Chall.
FAHL Champ.
Stanley Chall.

Stanley Cup Challenge

Best of 3-game series
Ottawa HC of the CAHL was challenged by the MNHA's Brandon Wheat Cities
DateAwayScoreHomeSeries
12/30 (MPHL) Winnipeg RC 1-9 Ottawa HC (FHL) OTT 1-0
1/1 (MPHL) Winnipeg RC 6-2 Ottawa HC (FHL) Tied 1-1
1/4 (MPHL) Winnipeg RC 0-2 Ottawa HC (FHL) OTT 2-1

Stanley Cup Challenge

Best of 3-game series
On January 30, 1904, a CAHL league game between the Ottawas and the Montreal Victorias started late and the game ended at the midnight curfew, with Ottawa leading 4โ€“1. The CAHL ordered the game to be replayed, and the ensuing debate caused the Ottawas to withdraw from the CAHL. The CAHL hoped that without Ottawa, the Cup would remain with the CAHL and be given to its new league champion, the Quebec Bulldogs. However, the Cup trustees decided otherwise, and although the Silver Seven were not affiliated with any league for the rest of the season, they could still receive challenges. About a month later, Ottawa swept a best-of-three Cup series against the OHA's Toronto Marlboros
DateAwayScoreHomeSeries
2/23 (indep.) Toronto 3-6 Ottawa HC (FHL) OTT 1-0
2/25 (indep.) Toronto 2-11 Ottawa HC (FHL) OTT 2-0

FAHL Championship & Stanley Cup Challenge

A two-game series between the Montreal Wanderers from FAHL and Ottawa Hockey Club from CAHL was arranged, for the Stanley Cup. The teams played the first game in Montreal to a tie of 5โ€“5. Montreal refused to play overtime, demanding that the game be considered a no-contest and proposed that the series start over as a best two-of-three series. The Cup trustees demanded that the series continued as scheduled and the Wanderers abandoned the challenge. The Wanderers demanded a replay of the game to be held in Montreal, which Ottawa refused. The series was cancelled, with Ottawa retained the Stanley Cup. championship. Ottawa then joined FAHL in the offseason.
DateAwayScoreHomeSeries
3/2 (FHL) Ottawa HC 5-5 Mtl. Wanderers (FHL) Tied 0-0

Stanley Cup Challenge

Best of 3-game series
Prior to the season, the MPHL champion Winnipeg RC challenged CAHL champion Ottawa HC for the Cup
DateAwayScoreHomeSeries
3/9 (indep.) Brandon 3-6 Ottawa HC (FHL) OTT 1-0
3/11 (indep.) Brandon 3-9 Ottawa HC (FHL) OTT 2-0