Odermatt knew he had retained the downhill globe before he had even left the starting gate in Courchevel, France, after compatriot and sole rival Franjo von Allmen failed to score.
With one downhill remaining in Norway on March 21, Odermatt has an insurmountable advantage over the triple gold medallist of 235 points in the speed standings.
Austria's Vincent Kriechmayr took the 100 points with his first win of the season, 0.09 ahead of Italian Giovanni Franzoni in second place and Odermatt third and 0.31 off the pace.
Von Allmen, a triple gold medallist at last month's Milano Cortina Olympics, skied out after starting 12th.
He needed to win but Odermatt, 14th out of the start hut, would have been champion regardless with a position of 10th or higher.
In the overall standings, Odermatt now leads Norwegian-born Brazilian Lucas Pinheiro Braathen by an insurmountable 632 points with six races remaining.
That outcome was a formality since Pinheiro Braathen, the 2026 Olympic giant slalom champion, is a technical skier who does not compete in downhill.
Odermatt also leads the super-G and giant slalom standings. There are two super-Gs scheduled for Courchevel this weekend before the final race in Kvitfjell.