The Chicago Teachers Union said last week that it will go on strike Oct. 11 if it does not reach an agreement with the district over a new contract.
Union leaders said the two sides were still negotiating, and a strike could be averted if they reach a tentative agreement before the deadline.
The announcement came just two days after the union revealed the results of a near-unanimous vote among members to authorize a strike. The last strike in the financially troubled district took place in 2012 and lasted seven days.