[2] Timonen was the youngest player to play for Finland at the 1993 IIHF World Junior Championships at the age of 17.

He played the next four seasons for the Predators, steadily improving his offensive output, until the 2004–05 NHL lockout.

During the lockout, Timonen played for his hometown team, KalPa, which he partly owns with former Flyers teammate Sami Kapanen.

Timonen represented Finland at the 2004 World Cup of Hockey and led his team in scoring with six points, the fifth-highest total overall in the tournament.

Shortly after, he signed a six-year, $37.8 million contract extension with them, a deal which made him the highest paid Finn in the NHL.

[5] The Flyers beat the Washington Capitals 4–3 and the Montreal Canadiens 4–1 in the first two rounds of the 2008 Stanley Cup playoffs.

During Game 4 of the Flyers' series with Montreal, Timonen was hit by a wrist shot on his foot by Canadiens defenseman Andrei Markov.

[7] That year, Timonen would play in his first ever Stanley Cup Finals, though the Flyers would lose to the Chicago Blackhawks in a six-game series.

While preparing for the 2014–15 season, on 5 August 2014, Timonen was diagnosed with blood clots in both of his lungs as well as in his right leg.

In February 2016, President Barack Obama received the winning Blackhawks team in the White House.

And that, first of all, as an old guy, it makes me feel good, but it’s also a sign of a great career when somebody who’s just able to stick with it and consistently contribute and make a huge difference, so give Kimmo a big one!Timonen commented on this to the Finnish state broadcasting company YLE:[14] This was absolutely a total surprise, and he really made a funny speech, and even to get a mention from him was such an honor for me, and then, of course, when he took a stand on my problems with blood clots, and when you think of what kind of a program I had to go through before I could put my skates on again, it really stirs some powerful feelings in an old man like me, I must admit.