Seattle Metropolitans, Stanley Cup champions 1917. Source.
Seattle Kraken versus Vancouver Canucks:
2021/9/26 Seattle 5 - 3 Vancouver exhibition game
2021/10/5 Vancouver 0 - 4 Seattle exhibition game
2021/10/23 Seattle 2 - 4 Vancouver regular season
2021/12/27 Vancouver vs Seattle regular season (postponed)
2022/1/1 Seattle [2 - 5] Vancouver regular season
Seattle Metropolitans versus Vancouver Millionaires:
1915-16
1915/12/28 Seattle 4 - 6 Vancouver regular season
1916/1/4 Vancouver 4 - 3 Seattle regular season
1916/1/25 Seattle 2 - 3 Vancouver regular season
1916/1/29 Vancouver 4 - 2 Seattle regular season
1916/2/18 Vancouver 1 - 4 Seattle regular season
1916/2/22 Seattle 4 - 2 Vancouver regular season
1916-17
1916/12/2 Vancouver 6 - 2 Seattle regular season
1916/12/12 Seattle 6 - 7 Vancouver regular season
1916/12/26 Seattle 7 - 2 Vancouver regular season
1916/12/30 Vancouver 4 - 7 Seattle regular season
1917/1/12 Seattle 12 - 3 Vancouver regular season
1917/1/27 Vancouver 3 - 2 Seattle regular season
1917/2/6 Seattle 8 - 4 Vancouver regular season
1917/2/17 Vancouver 4 - 2 Seattle regular season
1917-18
1918/1/4 Vancouver 3 - 2 Seattle regular season
1918/1/11 Seattle 5 - 2 Vancouver regular season
1918/1/22 Vancouver 4 - 5 Seattle regular season
1918/1/30 Seattle 4 - 3 Vancouver regular season
1918/2/4 Vancouver 6 - 5 Seattle regular season
1918/2/13 Seattle 3 - 1 Vancouver regular season
1918/2/18 Vancouver 8 - 1 Seattle regular season
1918/2/27 Seattle 2 - 1 Vancouver regular season
1918/3/6 Seattle 4 - 3 Vancouver regular season
1918/3/11 Vancouver 2 - 2 Seattle playoffs
1918/3/14 Seattle 0 - 1 Vancouver playoffs
1918-19
1919/1/1 Seattle 4 - 1 Vancouver regular season
1919/1/13 Vancouver 2 - 3 Seattle regular season
1919/1/15 Seattle 3 - 1 Vancouver regular season
1919/1/27 Vancouver 3 - 5 Seattle regular season
1919/1/29 Seattle 2 - 3 Vancouver regular season
1919/2/3 Vancouver 5 - 2 Seattle regular season
1919/2/12 Seattle 2 - 3 Vancouver regular season
1919/2/17 Vancouver 6 - 1 Seattle regular season
1919/2/26 Seattle 1 - 3 Vancouver regular season
1919/3/3 Vancouver 2 - 5 Seattle regular season
1919/3/12 Seattle 6 - 1 Vancouver playoffs
1919/3/14 Vancouver 4 - 1 Seattle playoffs
1919-20
1919/12/31 Seattle 3 - 2 Vancouver regular season
1920/1/5 Vancouver 3 - 2 Seattle regular season
1920/1/14 Seattle 1 - 3 Vancouver regular season
1920/1/19 Vancouver 2 - 5 Seattle regular season
1920/1/28 Seattle 4 - 3 Vancouver regular season
1920/2/2 Vancouver 4 - 3 Seattle regular season
1920/2/11 Seattle 2 - 4 Vancouver regular season
1920/2/16 Vancouver 2 - 3 Seattle regular season
1920/2/25 Seattle 0 - 8 Vancouver regular season
1920/3/1 Vancouver 5 - 2 Seattle regular season
1920/3/8 Vancouver 0 - 2 Seattle regular season
1920/3/12 Vancouver 3 - 0 Seattle playoffs
1920/3/15 Seattle 6 - 0 Vancouver playoffs
1920-21
1920/12/20 Vancouver 2 - 0 Seattle regular season
1920/12/29 Seattle 3 - 2 Vancouver regular season
1921/1/3 Vancouver 3 - 2 Seattle regular season
1921/1/12 Seattle 4 - 3 Vancouver regular season
1921/1/17 Vancouver 7 - 3 Seattle regular season
1921/1/26 Seattle 3 - 2 Vancouver regular season
1921/1/31 Vancouver 3 - 4 Seattle regular season
1921/2/9 Seattle 6 - 2 Vancouver regular season
1921/2/14 Vancouver 2 - 1 Seattle regular season
1921/2/23 Seattle 5 - 1 Vancouver regular season
1921/2/28 Vancouver 4 - 7 Seattle regular season
1921/3/9 Seattle 4 - 2 Vancouver regular season
1921/3/14 Seattle 0 - 7 Vancouver playoffs
1921/3/16 Vancouver 6 - 2 Seattle playoffs
1921-22
1921/12/5 Vancouver 2 - 1 Seattle regular season
1921/12/14 Seattle 5 - 4 Vancouver regular season
1921/12/19 Vancouver 1 - 2 Seattle regular season
1921/12/28 Seattle 0 - 5 Vancouver regular season
1922/1/2 Vancouver 5 - 0 Seattle regular season
1922/1/11 Seattle 5 - 2 Vancouver regular season
1922/1/16 Vancouver 10 - 3 Seattle regular season
1922/1/25 Seattle 4 - 3 Vancouver regular season
1922/1/30 Vancouver 3 - 2 Seattle regular season
1922/2/8 Seattle 3 - 0 Vancouver regular season
1922/2/13 Vancouver 2 - 0 Seattle regular season
1922/2/22 Seattle 7 - 2 Vancouver regular season
1922/x/x Vancouver 1 - 0 Seattle playoffs
1922/x/x Seattle 0 - 1 Vancouver playoffs
1922-23
The Vancouver Millionaires are now called the Maroons. There's inter-league play with the Western Canada Hockey League, which accounts for there being only one Seattle/Vancouver game in January.
1922/11/13 Vancouver 2 - 8 Seattle regular season
1922/11/22 Seattle 2 - 5 Vancouver regular season
1922/11/27 Vancouver 4 - 8 Seattle regular season
1922/12/13 Seattle 3 - 2 Vancouver regular season
1922/12/25 Vancouver 4 - 0 Seattle regular season
1922/12/27 Seattle 3 - 4 Vancouver regular season
1923/1/17 Seattle 1 - 2 Vancouver regular season
1923/2/5 Vancouver 4 - 0 Seattle regular season
1923/2/21 Seattle 6 - 3 Vancouver regular season
1923/2/23 Vancouver 4 - 2 Seattle regular season
1923/2/26 Vancouver 12 - 3 Seattle regular season
1923-24
1923/11/12 Vancouver 2 - 3 Seattle regular season
1923/11/21 Seattle 3 - 1 Vancouver regular season
1923/12/26 Seattle 2 - 5 Vancouver regular season
1924/1/1 Vancouver 2 - 4 Seattle regular season
1924/2/6 Vancouver 2 - 4 Seattle regular season
1924/2/20 Seattle 3 - 0 Vancouver regular season
1924/2/22 Vancouver 2 - 4 Seattle regular season
1924/2/25 Vancouver 6 - 0 Seattle regular season
1924/x/x Vancouver 2 - 2 Seattle playoffs
1924/x/x Seattle 1 - 2 Vancouver playoffs
Seattle folded along with the PCHA, while Vancouver went on to play two more seasons in the WCHL.
Source: Wikipedia PCHA seasons articles.
Somebody with a Vancouver Public Library account could look up the missing playoff dates in the VPL's digital newspaper archive and post them in the comments.
Home teams are listed first.
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