If you are using , you can use the VLSub plugin to automatically search and download the correct subtitle for your specific file hash while the movie is playing.

Subdl : Highly recommended for finding specific release-matched subtitles.

OpenSubtitles: One of the largest libraries for diverse movie formats and languages.

Top 20 Sites to Download Subtitles for Movies, TV Shows and YouTube

Subsource : A modern alternative for the latest movie and TV show releases.