While library availability varies by region, Netflix frequently offers Japanese subtitles for its major Hollywood titles. Users can often toggle these in the Audio & Subtitles menu during playback.
One of the most consistent digital sources, Apple TV's Interstellar page specifically lists Japanese subtitles and closed captions as available options. interstellar japanese subtitles
For the highest quality, the official Japanese Blu-ray release is the gold standard. The Interstellar 4K Ultra HD & Blu-ray Set includes dedicated Japanese subtitle tracks for the main feature and special bonus content. While library availability varies by region
The film is available to stream or buy on Amazon Prime Video, though subtitle availability may depend on your specific store location (e.g., Amazon.co.jp). Blu-ray and Physical Media: Amazon.co.jp). Blu-ray and Physical Media: