Michael Amadio (two goals, one assist) and Reilly Smith (one goal, two assists) each had three points, and Laurent Brossoit made 20 saves for Vegas (50-22-9), which is 4-0-3 in its past seven games.
The Golden Knights remained two points ahead of the Edmonton Oilers for first place in the Pacific heading into the regular-season finale at Seattle on Thursday. The Oilers won 2-1 in overtime against the Colorado Avalanche on Tuesday and finish up their regular season at home Thursday against the San Jose Sharks.
"(Playing a meaningful game Thursday) is good for us," Smith said. "Sometimes, you take foot off the gas and start the playoffs maybe a step behind. There's no reason for that. A lot on the line. I'm looking forward to the game Thursday."
Yanni Gourde scored, and Joey Daccord made 33 saves for Seattle (46-27-8), which had won five in a row.
The Kraken would have moved into a tie for third place in Pacific with the Los Angeles Kings with a victory. The Kings play their regular-season finale Thursday at the Anaheim Ducks.
"We're not happy with the result; not a lot energy tonight," Seattle coach Dave Hakstol said. "We had a good burst for probably the first 15, 16 minutes. We just couldn't find any energy in the second and third. They played well. They were on top of us. They didn't give us a lot of time and space. When you're a half-step slow and not a ton of energy, it was a tough night to generate anything with the puck."
Amadio gave Vegas a 1-0 lead at 5:37 of the first period. William Karlsson carried the puck into the offensive zone and moved the puck to Smith in the right face-off circle, where he quickly sent a cross-ice feed to Amadio for a tap-in.
"I put myself at a bad angle. At the same time, I saw 'Ammo' drifting in backdoor," Smith said. " … It hit a couple skates and sticks, and fortunately it landed on his stick."