Through the 2008 season, that was December 5, 1976 when the Bears defeated the Seahawks in Seattle by the score of 34-7.
Since then the Bears have lost 4 straight games in Seattle (1982, 1984, 2003, 2007).
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The last time it happened was in an NFC divisional playoff game held at AT&T Stadium in Arlington, Texas on January 15, 2017. The Green Packers defeated the Dallas Cowboys 34 to 31.