Isaak Phillips scored his first NHL goal at 10:45 of the second period to bring Chicago to within 6-2.
Max Domi's power-play goal 51 seconds into the third period made it 6-3.
McCann, who was playing in his 466th game, completed his first NHL hat trick at 1:54 to make it 7-3 lead. Bjorkstrand then made it 8-3 at 2:37.
Raddysh scored a power-play goal at 16:50 to cut it to 8-4 before Patrick Kane scored at 19:45 for the 8-5 final.
"Yeah, it was just collective," Chicago coach Luke Richardson said. "Nobody was prepared to play today, physically and mentally. You know, I think probably scoring right after they scored to make it 1-1, it just felt like [we thought], 'Oh, we were going to be OK,' the way we were playing. And we were definitely not playing well. It may have been the worst thing that happened to us, instead of not scoring there and maybe having to work back into the game. I think we just thought it was going to happen tonight."
NOTES: Seattle scored the 15th fastest five goals in NHL history. The Pittsburgh Penguins scored five times in 2:07 on Nov. 22, 1972, in a 10-4 win against the St. Louis Blues. … Jones, who had a shutout in each of his past two games, had his streak end at 139:19. … Forward Jordan Eberle played his 900th NHL game. … Seattle forward Jaden Schwartz was a late scratch with an undisclosed injury. … Kraken defenseman Vince Dunn had an assist to extend his point streak to six games (three goals, seven assists). … Oleksiak's assist was his 100th NHL point. … Kane had a game-high seven shots in 18:23 after missing three games with a lower-body injury.