Sflix subtitles are always out of sync, how can I fix the timing so they match the video?

If the subtitles are always ahead or behind, try pausing and restarting Sflix or moving to a different web browser. Lag can happen because of how the browser renders things.

If there is a "delay/offset" setting for subtitles in the video player, try changing it by a few hundred milliseconds. This can often fix small time issues.

Download the subtitle file (if you can see it) and use a subtitle-syncing tool like SubtitleTools Sync Shifter or Subconverter to change all the timings at once. You can also use a partial shifter if only some timings are off.

Then, if your player lets you, load the changed subtitle file instead of the original. This will make the words match the speech more closely.