Lantz also coached the Berlin Thunder and Rhein Fire of NFL Europe. In three seasons (2004–2006) with the Berlin Thunder, Lantz coached the team to an 18–11–1 regular season record. In addition, the Thunder competed in two World Bowls. Berlin won World Bowl XII, 30–24, over the Frankfurt Galaxy on June 12, 2004, in Gelsenkirchen, Germany.[2] The following year, the Thunder fell in World Bowl XIII, 27–21, to the Amsterdam Admirals on June 11, 2005, in Düsseldorf, Germany.[3] The 2006 Berlin season included a 17–17 tie on the road against the Hamburg Sea Devils on April 1, one of just two ties in the history of NFL Europe. Lantz took the reins of the Rhein Fire in 2007, the final season of NFL Europe. He coached the team to a 4–6 record.[4]
Lantz died on March 26, 2023, at the age of 85.[5]