The 2015–16 season was a breakout season for the Thunderbirds, and was one of the most successful seasons in franchise history. During the season, the Thunderbirds clinched the U.S. Division after a 4–1 win over the Spokane Chiefs on March 15. This was Seattle's third division championship in team history and first since the 2004–05 season. Seattle also finished the regular season with the second most wins in team history (45). In the quarterfinal round of the 2015-2016 WHL Playoffs, the Thunderbirds swept the Prince George Cougars, 4 games to 0, and advanced to the semifinal round against the Everett Silvertips, where the Thunderbirds dominated the Silvertips, winning the series 4 games to 1. With the win, they advanced to the Western Conference Finals against the Kelowna Rockets, the defending WHL Champions. Once again, the Thunderbirds continued their dominant playoff run, as they swept the series against the Rockets, 4 games to 0. The series-clinching win came in a double-overtime thriller as rookie Matt Wedman scored the game-winning goal halfway through the second overtime to give the Thunderbirds the 5–4 overtime victory, clinching the Western Conference championship. With the win, the Thunderbirds advanced to the WHL Championship for the first time since 1996–97. The Thunderbirds faced the Brandon Wheat Kings in the league final and lost the series 4–1. The finals with Brandon was much closer than the end result, as the first three games were decided in overtime and all three ending with Wheat King victories.
