Six years after Lehtera was selected by the St. Louis Blues in the third round (No. 65) of the 2008 NHL Draft, they finally signed him to an NHL contract on July 1, 2014.
He proved to be worth the wait upon joining the Blues in 2014-15. Lehtera scored 14 goals and had a plus-21 rating, the third highest by a first-year St. Louis player. He also had a natural hat trick Nov. 11, 2014, against the Buffalo Sabres, the first by a Blues player since Al MacInnis on Oct. 12, 1998.