SEATTLE — Robbie Keane stood next to the conference title trophy, politely smiled for the picture and let the confetti rain down.

Just as quick, Keane, David Beckham and the rest of the Los Angeles Galaxy were rushing off the stage at midfield and ready to get out of Seattle, thankful there is still one more game in their surprising season.

“Certainly they were the better team tonight there’s no question,” Keane said. “At the end of the day we’re in the final, that’s all that matter.”

Eddie Johnson and Zach Scott scored to give Seattle a 2-0 lead, but Keane converted a penalty kick in the 68th minute on Sunday night that clinched the Los Angeles Galaxy’s 4-2 aggregate victory over the Sounders in the Western Conference finals and a spot in the MLS Cup final for the second straight year.

Dynamo 4, D.C. United 2

WASHINGTON — The Houston Dynamo advanced to their second straight MLS Cup final and fourth in seven years, tying D.C. United 1-1 Sunday for a 4-2 aggregate win in the Eastern Conference final.

Boniek Garcia scored in the 33rd minute for the Dynamo, which will play at the Los Angeles Galaxy or Seattle Sounders in the final on Dec. 1. The Galaxy, who beat Houston 1-0 in last year’s final, held a 3-0 lead over the Sounders going into Sunday night’s second leg at Seattle in their home-and-home, total-goals series.

Branko Boskovic scored in the 83rd minute for D.C., which has not won the MLS Cup since 2004.

Houston, which won consecutive MLS Cup titles in 2006 and 2007, qualified for the 2013-14 CONCACAF Champions League. But the Dynamo may miss Ricardo Clark for the MLS final — the midfielder reinjured a groin and left in the 66th minute.