Yes, they appeared in Super Bowl 40, but lost.
No. The Pittsburgh Steelers beat the Seattle Seahawks in the 2006 Super Bowl.
2, once in 2006 & once in 2014
The Seattle Seahawks have been to the Super Bowl three times. They first appeared in 2005, then in 2013 and 2014. They have won one Super Bowl. It was Super Bowl XLVIII (2013) against the Denver Broncos.
0% seeing as Super Bowl 40 has already been played by the Pittsburgh Steelers and the Seattle Seahawks with the Steelers coming out the victors.
As of February 2015, the Seattle Seahawks have played in 3 Super Bowls. Super Bowl XL, which they lost to the Pittsburgh Steelers, 21-10 and Super Bowl XLVIII, where they defeated the Denver Broncos, 43-8, and then super bowl XLVIV where they lost to the patriots 24-28
There were several questionable penalties on the Seahawks as SB XL has been called the most weakly officiated Superbowl in history. Ultimately, though, the Seahawks lost because they played scared - they were afraid of the hits delivered by the Steelers and could not handle hard-hitting opponents, long a problem with the team under Mike Holmgren.
As of Super Bowl XLVIII, the Seahawks have played in two Super Bowls, that being Super Bowl XL in 2006 when they lost to the Pittsburgh Steelers, 21-10. Additionally, they played in Super Bowl XLVIII where they played the Denver Broncos and won 43-8. This was the first time the Seattle Seahawks were crowned Super Bowl champions and took home the Vince Lombardi trophy.
The Steelers and Eagles have never faced each other in the Super Bowl. Pittsburgh has been to the Super Bowl six times, facing the Minnesota Vikings (IX), the Dallas Cowboys (X, XIII, XXX) , The LA Rams (XIV), the Seattle Seahawks (XL). They are 5-1 in Super Bowl play. Philadelphia has been to the Super Bowl twice, fsacing the Oakland Raiders (XV) and the New England Patriots (XXXIX). The Eagles are 0-2 in Super Bowl play.
Three ... Super Bowls XXVII and XXVIII with the Dallas Cowboys and Super Bowl XXIX with the San Francisco 49ers.
Seneca Wallace has: Played Himself - Seattle Seahawks Quarterback in "NFL Monday Night Football" in 1970. Played Himself - Iowa St. Cyclones Quarterback in "2001 Independence Bowl" in 2001. Played Himself - Iowa St. Cyclones Quarterback in "2002 Humanitarian Bowl" in 2002. Played Himself - Seattle Seahawks Quarterback in "2005 NFC Championship Game" in 2006. Played Himself - Seattle Seahawks Quarterback in "NBC Sunday Night Football" in 2006. Played Himself - Seattle Seahawks Quarterback in "Super Bowl XL" in 2006.
Currently, there have been no Super Bowl games played in Seattle and none scheduled to be played in Seattle through 2011.
Sean Locklear has: Played Himself - Seattle Seahawks Tackle in "NFL Monday Night Football" in 1970. Played Himself - 84th Overall Pick in "2004 NFL Draft" in 2004. Played Himself - Seattle Seahawks Tackle in "2005 NFC Championship Game" in 2006. Played Himself - Seattle Seahawks Tackle in "NBC Sunday Night Football" in 2006. Played Himself - Seattle Seahawks Offensive Tackle in "Super Bowl XL" in 2006.