ScriptReference/SceneManagement.EditorSceneManager.SaveScene

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ScriptReference/SceneManagement.EditorSceneManager.SaveScene

https://docs.unity3d.com/ScriptReference/SceneManagement.EditorSceneManager.SaveScene.html

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Comment by @rayvshimself:

If you want to save a newly created scene, you have to use ".unity" at the end of the path.
Like in this example:

Scene newScene = EditorSceneManager.NewScene(NewSceneSetup.DefaultGameObjects, NewSceneMode.Single);  
EditorSceneManager.SaveScene(newScene, scenePath+"/"+sceneName+".unity", false);