The 4K UHD release includes English SDH (Subtitles for the Deaf and Hard-of-Hearing) for both the theatrical and director's cuts.
Finding English subtitles for Donnie Darko is straightforward, whether you're watching a physical copy or looking to download them for a digital file. Official Subtitles (Physical & Streaming) Donnie Darko subtitles English
: A site specifically dedicated to high-quality English language tracks. Script for Reference The 4K UHD release includes English SDH (Subtitles
: A massive community-driven site that is great for finding subtitles for older or rare editions. Script for Reference : A massive community-driven site
Standard DVD versions also feature English and Spanish subtitles.
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If you prefer reading the dialogue rather than having on-screen text, the full Donnie Darko screenplay is available online via Daily Script. Donnie Darko (2001) - DVD Movie Guide