“Demon Slayer: Kimetsu no Yaiba – Infinity Castle” doesn’t have a fixed, globally announced “run until” date, but you can expect a relatively standard big‑anime event run: about 4–8 weeks in most major markets, with some theaters dropping it sooner and others keeping limited showings longer depending on ticket sales and local demand.

How long it will likely stay in theaters

  • The film opened in Japan in mid‑July 2025 and in the US/UK and many other regions around mid‑September 2025.
  • Box office numbers show it as a major hit (over 700 million worldwide), which usually encourages theaters to hold onto it a bit longer than a niche anime release.
  • However, individual cinemas often cut back showtimes after the first 2–3 weeks once the initial rush slows, especially if new blockbusters arrive.

A reasonable expectation in most cities is:

  • Full, frequent showtimes: first 2–3 weeks after release.
  • Reduced/later‑evening showtimes: weeks 4–6.
  • After 6–8 weeks, only a few locations may still run it, often in big chains or specialty cinemas.

Because it is marketed as “only in theaters” for 2025, cinemas know that hardcore fans must go there to see it, but that doesn’t force them to keep it on screens once demand drops.

Why you might see it disappear quickly

  • Some fans already reported that it vanished from their local listings after a short time, even while others could still find it at big chains like AMC.
  • Anime event films often have a front‑loaded audience: most fans rush out opening weekend, so smaller theaters may replace it once seats stop filling.

Think of it as: the global run is long, but your local run can be fairly short if your cinema rotates titles aggressively.

Streaming and “window” timing

  • Crunchyroll and news outlets have confirmed that Infinity Castle would not be on streaming during 2025 and that theaters are the only way to watch it in that year.
  • Industry chatter and coverage suggest streaming will likely not happen until sometime in 2026, with physical/Blu‑ray releases typically preceding streaming to maximize sales.

This longer theatrical‑to‑streaming window is one reason many regions pushed strong “go see it in theaters now” messaging.

Practical tips to catch it

  • Check major chains (AMC, Cinemark, Regal, etc.) and aggregators like Fandango or your local equivalent; those often keep it longest and show late‑run times.
  • Look for subtitled vs. dubbed showtimes; one version might stick around longer depending on local preference.
  • If it has already disappeared near you, keep an eye out for:
    • Special anime nights or encore screenings later in 2026.
* Possible limited runs tied to Blu‑ray or sequel‑trilogy promotions.

So while there’s no exact “in theaters until” date, plan as if you have a few weeks from your local release date to see it comfortably—and move fast if your city tends to cycle movies quickly.

Information gathered from public forums or data available on the internet and portrayed here.