The 26-year-old secured the biggest jumps in both rounds, 137.5m and 135m, to grab the top step on the podium ahead of Poland's Kamil Stoch and Austria's Stefan Kraft.
Freitag said: "After the second place yesterday I was looking forward to this competition. Today it was easier for everyone, the conditions were a lot better and it wasn't snowing.
"I already had a good start in the qualification, my first jump today was good and the second one was amazing. It's nice that it's going well for our entire team and we can enjoy it together."
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This event was the final test before the opener of the Four Hills Tournament on December 29 in Oberstdorf and double Olympic champion Stoch was confident after his silver medal.

Richard Freitag of Germany waits for the results during the Ski Jumping Men's HS142 Large Hill competition at the FIS World Cup Ruka Nordic 2017 in Ruka, Kuusamo in northern Finland on November 26, 2017.

Image credit: Getty Images

He said: "The conditions were better than yesterday. I'm very satisfied with this competition. My shape is good and so I'm calm and relaxed before the Four Hills Tournament.
"I don't feel any pressure now, I'm calm and I will work on some details before the Four Hills Tournament starts."
Freitag has 550 points, more than 150 points clear at the top of the overall World Cup standings, ahead of Andreas Wellinger on 399 and Norway's Daniel Andre Tande on 356.
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