How long is Knock Knock?

Knock Knock is 1 h 39 min long (99 minutes). If you start it at 8:00 pm it ends at 9:39 pm; add about 20 minutes if you watch trailers first.

What is Knock Knock rated?

Knock Knock is rated R in the US.

Where can I stream Knock Knock?

In the US, as of 2026-11-05: HBO Max Amazon Channel (subscription), HBO Max (subscription). Availability changes often; this page loads the live list for your country (streaming availability by JustWatch).

Lights Down — what movie do we watch?Pick tonight's movie →

Lights Down › Tonight's lists › Thrillers under 100 minutes › Knock Knock

Where to watch Knock Knock (2015) tonight

Knock Knock (2015) runs 1 h 39 min, is rated R in the US and averages 5.4 from 3,625 TMDB members. When a devoted husband and father is left home alone for the weekend, two stranded young women unexpectedly knock on his door for help. What starts out as a kind gesture results in a dangerous seduction and a deadly game of cat and mouse.

Runtime: 1 h 39 min — ends 9:39 pm if you start at 8:00 pm
Rated: R (US)
Genres: Horror, Thriller, Crime
Released: June 26, 2015
TMDB rating: 5.4 / 10 from 3,625 votes
Director: Eli Roth
Starring: Keanu Reeves, Lorenza Izzo, Ana de Armas, Aaron Burns
Language: English

Good for a group? Yes — a crowd movie.Horror and Thriller hold a room: people can talk, laugh or scream over it and still follow what is going on. Rated R in the US — check who is in the room.

Where to watch it tonight

Availability loads live for your country. See where Knock Knock streams (JustWatch via TMDB) →

Streaming availability by JustWatch. In the US, as of 2026-11-05: HBO Max Amazon Channel (subscription), HBO Max (subscription).

Questions people ask

How long is Knock Knock?: Knock Knock is 1 h 39 min long (99 minutes). If you start it at 8:00 pm it ends at 9:39 pm; add about 20 minutes if you watch trailers first.
What is Knock Knock rated?: Knock Knock is rated R in the US.
Is Knock Knock a good movie to watch with a group?: Yes — a crowd movie. Horror and Thriller hold a room: people can talk, laugh or scream over it and still follow what is going on. Rated R in the US — check who is in the room.
Where can I stream Knock Knock?: In the US, as of 2026-11-05: HBO Max Amazon Channel (subscription), HBO Max (subscription). Availability changes often; this page loads the live list for your country (streaming availability by JustWatch).

Lists it could be on

If you like Knock Knock

Knock Knock on TMDB · This product uses the TMDB API but is not endorsed or certified by TMDB.

Lights Down is a free tool: tell it your streaming services and how long you have, and it ranks what you can stream tonight, with a this-or-that, a roll, a bracket and a wheel. Movie data from TMDB; streaming availability by JustWatch. Page updated 2026-11-05. This product uses the TMDB API but is not endorsed or certified by TMDB. Lights Down is a Somebody Decide program. How the data works · Legal & privacy · Tonight's lists