A Bucks County judge had ordered at the request of the Neshaminy School District that teachers end their strike Friday.
But the Neshaminy Federation of Teachers says teachers offered to return to work a few days early "as a sign of good faith."
Teachers in the district, which has about 7,000 students, went on strike on June 4, the second walkout this year. There was an eight-day strike in January.
The two sides have been locked in a bitter contract dispute for four years. The union's 633 teachers, guidance counselors, librarians and nurses have been working under the terms of an expired contract.