On 29 June 2017, Läck was traded by the Hurricanes along with Ryan Murphy and a 2019 seventh-round pick to the Calgary Flames in exchange for prospect Keegan Kanzig and sixth-round pick in 2019. On 23 November 2017, Läck was placed on waivers by the Flames with the intention of assigning him to the Flames' AHL affiliate, the Stockton Heat. He was later assigned to the Heat on 24 November 2017.