On what weekday did The West Wing air until the end of season six?

The West Wing aired on Wednesday until the end of season six. NBC broadcast the series in its Wednesday 9 p.m. Eastern time slot from its 1999 debut through the sixth season.

The schedule was part of the show's original identity. Its first episode aired on September 22, 1999, and the series remained associated with Wednesday-night political drama during its first six seasons.

NBC moved the seventh and final season to Sunday at 8 p.m. The change placed the program against established Sunday-night competition and coincided with a significant ratings decline. The final season therefore aired on a different weekday, but the question asks about the period ending with season six.

A common mistake is answering Sunday because that was the show's final-season slot. Thursday, Monday, and Sunday were not the regular broadcast day through the end of season six; Wednesday is the canonical answer.