A finalist for the Calder Trophy, given to the NHL rookie of the year, he was 24-5-1 with a 1.89 goals-against average, .927 save percentage and five shutouts in 32 regular-season games (30 starts).
Binnington played last season on a one-year, two-way contract he signed July 6, 2018, and moved up from fourth on the Blues depth chart.
"It wasn't always easy. There were down times. I put myself in tough spots," Binnington said following Game 7 of the Stanley Cup Final against the Boston Bruins. "The bigger the challenge, the greater the response. I just tried to adjust to the challenge every day and be the goalie I thought I could be and take advantage of my talent."