Bobby Wagner blocked Dan Bailey's field goal attempt midway through the fourth quarter, sparking the Seahawks to two late touchdowns and a 21-7 win over Minnesota.
It was Seattle's fourth straight NFL victory.
Chris Carson followed the blocked kick with a 2-yard TD run with 2:53 left, and Justin Coleman provided the insurance with a 29-yard fumble return touchdown 18 seconds later.
The Seahawks (8-5) moved to the brink of wrapping up a wild-card spot in the NFC.
One win in Seattle's final three games including games against lowly San Francisco and Arizona should be enough to put the Seahawks into the post-season.
Minnesota's chances of winning the NFC North took a major hit, but the Vikings still hold the No. 6 spot in the NFC.