The Flames released Glass from his professional tryout offer Wednesday, Aaron Vickers of NHL.com reports.
Glass allowed two goals on 11 shots over about 20 minutes during a 4-3 overtime loss to the Jets on Friday.
Glass signed a professional tryout offer with the Flames on Monday, RDS.ca reports.
Glass was summoned from AHL Rockford on Monday.
The Blackhawks placed Glass on waivers Wednesday, Renaud Lavoie of TVA Sports reports.
Glass will tend twine against the Golden Knights on Tuesday.
Glass allowed three goals on 19 shots in a 3-0 loss to the Wild on Saturday.
Glass will guard the away goal Saturday against the Wild, Mark Lazerus of the Chicago Sun-Times reports.