Currently in VSCode settings you can configure format on save as following:
\"editor.formatOnSave\": true
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If you came across this question as I did because you were redirected because of this question VSCode : disable formatting of a specific file (or extension) which says, this is a duplicate (I don't feel so, because I wanted it for a specific file) and you're looking for a "one-time" solution:
VS Code has a shortcut "now" (I don't know since when) for saving a file without formatting listed under the command workbench.action.files.saveWithoutFormatting - Default keybinding should be
CTRL + K CTRL + SHIFT + S
(simply keep CTRL pressed and then type K + SHIFT + S).
On OS X the default keybinding is
CMD + k then press s