A suffocating defence, methodical offence and an electrifying home crowd was once again the winning formula for the Seahawks.
Marshawn Lynch rushed for 110 yards and two touchdowns, quarterback Russell Wilson threw for two more, and Seattle's defence squeezed the life out of Green Bay quarterback Aaron Rodgers and his offence.
"We don't change for anybody. (The Packers are) a dynamic offence but it says a lot about us that we could shut them down," Seahawks safety Earl Thomas told reporters.
"This was the first championship game out of the way, now it's on to number two. Every week is a championship game."
After crushing the Denver Broncos 43-8 to win the Super Bowl in February, the Seahawks are vying to become the first back-to-back champions since New England in the 2003 and 2004 seasons.
The Packers took a 7-3 lead through the first quarter, but Seattle's Wilson tossed a 33-yard touchdown to Ricardo Lockette in the second to move ahead.
Seattle's Lynch scored his first touchdown to give the hosts a 17-10 lead at halftime before the Seahawks added a field goal and a safety in the third quarter to go up 22-10.
Lynch's second score of the night made it 29-10 early in the fourth.
Green Bay Packers quarterback Aaron Rodgers (12) looks for a receiver while pressured by Seattle Seahawks defensive …
Rodgers threw a three-yard touchdown to Randall Cobb to give the Packers a sniff at a comeback, but Wilson answered with a drive of his own and tossed a 15-yard score to Derrick Coleman to complete the scoring at 36-16.
Rodgers, one of the top quarterbacks in the NFL, was held to just 189 yards passing with one touchdown and one interception.
"They are the Seattle Seahawks - they're a great defence," said Rodgers, who missed seven games last season because of a collarbone injury.
"We didn't expect to convert every drive but we have to put more points on the board."
Rubbing salt in the Packers' wounds, second-year running back Eddie Lacy left in the fourth quarter with a possible concussion.
The last time Green Bay visited Seattle in 2012 they lost on a last-second touchdown after a controversial call by replacement officials.
This time around they never looked like taking it down to the wire.
Seattle quarterback Wilson finished with 191 yards passing and 29 yards rushing while the Seattle defence recorded three sacks.
The Seahawks have now won 16 of the last 17 games at their boisterous CenturyLink Field.
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