Koudelka's win also allowed him to take over as the overall leader in the World Cup after five rounds.
His 153.9 points on Sunday from a jump of 140m was enough to see off Slovenia's Peter Prevc (149.9 pts) and Austria's Michael Hayboeck (149.4).
Four-time Olympic champion Simon Ammann of Switzerland was fifth with 147 points while Saturday's winner Gregor Schlierenzauer was a disappointing 13th.
Results (only one jump due to poor weather conditions):
1. Roman Koudelka (CZE) 153.9 pts (140.0 m),
2. Peter Prevc (SLO) 149.9 pts (139.0 m),
3. Michael Hayboeck (AUT) 149.4 pts (141.5 m),
4. Severin Freund (GER) 148.2 pts (136.0 m),
5. Simon Ammann (SUI) 147.0 pts (142.0 m)
Selected:
13. Gregor Schlierenzauer (AUT) 136.8 pts (132.5 m)
World Cup standings (after five rounds):
1. Roman Koudelka (CZE) 290 pts,
2. Simon Ammann (SUI) 281,
3. Anders Fannemel (NOR) 250,
4. Peter Prevc (SLO) 249,
5. Michael Hayboeck (AUT) 239,
6. Noriaki Kasai (JPN) 236
Selected:
9. Gregor Schlierenzauer (AUT) 165
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