Where to watch The 21-Day Theory (2025) in the UK
The 21-Day Theory (2025) is not currently listed on any UK streaming, rental, or purchase service. Page generated on 26 September 2026 from provider data; confirm the exact offer before paying.
Using the 21-Day Theory, a determined woman pursues a wealthy man to prove he's straight—but the truth defies her expectations.
Watch the trailer
“เป็นแฟนกัน 21 วัน” สุดท้ายแล้วทฤษฎีนี้จะลงเอยแบบไหน ? [Club Friday The Series ทฤษฎี 21 วัน Trailer]
Streaming options in the United Kingdom
Availability by JustWatch via TMDB. Links may open a provider search or homepage; check the exact offer there.
The source may have incomplete coverage. This does not prove the title is unavailable; check the provider directly.
Page generated: — sourced from The Movie Database. Machine-readable: Markdown · JSON.
Before you pay to watch The 21-Day Theory
These are series-level listings, not confirmation that every season is included. Check your season and the final episode on the provider.
A Stream listing can require a particular tier or paid add-on. Free viewing may require adverts, an account or a TV Licence. Rentals and purchases are separate payments.
The generation date above is not a manual verification date. Provider data and pages may be cached. Read about our sources and limitations.
Report an incorrect listing · Understand Prime add-ons · Check every season
Is The 21-Day Theory on Netflix, Disney+ or Prime Video?
Matches in the returned UK listings; absence is not proof of unavailability.
Netflix
No UK listing for The 21-Day Theory (2025) on Netflix was returned. The data may be incomplete; check the provider directly.
Amazon Prime Video
No UK listing for The 21-Day Theory (2025) on Amazon Prime Video was returned. The data may be incomplete; check the provider directly.
Disney+
No UK listing for The 21-Day Theory (2025) on Disney+ was returned. The data may be incomplete; check the provider directly.
Cast & crew
Top-billed cast in The 21-Day Theory.
More drama on UK streaming
Browse other titles in the same genres, cached upstream.
Browse by streaming service (UK)
See what else is on each service right now.
The 21-Day Theory — frequently asked questions
Where can I watch The 21-Day Theory in the UK?
The 21-Day Theory (2025) is not currently listed by any UK streaming, rental, or purchase service in our TMDB source data. It may be on physical media, an aggregator, or pending a UK release. Check back later — availability changes frequently.
Are all seasons of The 21-Day Theory on the same service?
Not always — TV licensing is sometimes negotiated season by season. ScreenSearch shows availability across all seasons on the title's page; for season-specific availability, look at the season picker inside the search dialog.
Is The 21-Day Theory on Netflix in the UK?
No UK listing for The 21-Day Theory (2025) on Netflix was returned. The data may be incomplete; check the provider directly.
Is The 21-Day Theory on Amazon Prime Video in the UK?
No UK listing for The 21-Day Theory (2025) on Amazon Prime Video was returned. The data may be incomplete; check the provider directly.
Is The 21-Day Theory on Disney+ in the UK?
No UK listing for The 21-Day Theory (2025) on Disney+ was returned. The data may be incomplete; check the provider directly.
How accurate is this TV series's availability data?
Availability is sourced from The Movie Database (TMDB), which in turn pulls from JustWatch. Listings are cached upstream. For purchase decisions, the provider's own site is the source of truth.
Looking for something else?
ScreenSearch indexes over a million films and TV shows. Type any title to instantly find where it's streaming in the UK.
Search any title