SEATTLE » Seattle teachers approved a labor contract between the union and its school district Sunday, officially ending a weeklong strike that had delayed the start of school for 53,000 students.

The walkout began Sept. 9 in Washington state’s largest school district and was suspended pending the outcome of Sunday’s vote by the 5,000-member union. The sides had reached a tentative agreement last week, allowing the first day of school to begin Thursday.

Members of the Seattle Education Association, which include teachers and support staff, ratified the three-year deal at a meeting in downtown Seattle.

The contract gives teachers a 9.5 percent pay raise over three years, not including state cost-of-living adjustments, guaranteed 30-minute recesses for elementary students and more teacher input over standardized tests.

Teachers have been working without a contract since the end of August. They had initially asked for a 21 percent raise spread over three years but came down dramatically from that request. Educators had complained that the high cost of living in a city with a booming population of well-paid tech workers was pricing them out.

The contract dispute marked a strategy shift by teachers nationwide to take on broader issues that promote the public interest, experts have said. The Seattle teachers union tapped into community protests over too much testing, not enough recess and concerns about racial disparity in discipline and student performance.

Six days of school will have to be rescheduled, which the district said could extend the school year or shorten midyear vacation breaks. Graduation dates for seniors will likely change as well.