This year's series between Ottawa and Anaheim drew the third-highest overall average for a Cup final on CBC in the last 10 years and sixth-highest since 1989.
Last year's Edmonton-Carolina series, which went seven games, averaged 3.042 million viewers. The 2004 series between Calgary and Tampa Bay attracted an average of 3.735 million, the highest since 1989.
An average of 2.163 million viewers tuned in to watch Anaheim win the Cup on Wednesday night with a 6-2 win over Ottawa in Game 5.
Last year's Game 5 between the Oilers and the Hurricanes averaged 2.690 million viewers on CBC.
Overall, CBC's playoff ratings were down 10 per cent from last year as an average of 1.477 million viewers tuned in compared to 1.649 million in 2006.
The U.S. national ratings, which have hit record lows this season, were expected later Thursday.
The highest CBC audience for a Stanley Cup final was 4.957 million for Game 7 of the Canucks-Rangers series on June 14, 1994.