If you’ve been waiting to watch Kevin Costner’s ambitious western epic, your moment has finally arrived. Horizon: An American Saga – Chapter 1 is now officially streaming on Prime Video as of May 23, 2026 — marking the film’s very first appearance outside of HBO Max. Whether you missed it in theaters or on Netflix, this is your next best chance to experience one of Hollywood’s most passion-driven passion projects in years.
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What Is Horizon: An American Saga?
Academy Award-winning filmmaker Kevin Costner marks his return to feature film directing with Horizon: An American Saga, a multi-faceted chronicle covering the Civil War expansion and settlement of the American West.
The Western epic follows an Apache tribe, a group of settlers, and a wide-ranging cast of characters as they grapple with brutal circumstances while navigating life in the West. The film — the first in a series of four planned installments — takes place across 15 years in pre- and post-Civil War America.
In 1859, two surveyors draw lines in the desert to mark the place they intend to call home in Arizona’s San Pedro Valley — a place they plan to call Horizon. But when an Apache tribe sets the would-be settlement ablaze, killing a majority of the settlers in a violent raid, the story truly begins to unfold.
Key Facts at a Glance
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║ – Horizon: Chapter 1 began streaming on Prime Video on May 23, 2026. ║
║ – Kevin Costner wrote, directed, produced, and starred in the film. ║
║ – The total budget across Chapters 1 and 2 was approximately $100M. ║
║ – Costner personally invested around $38 million of his own money. ║
║ – Chapter 1 grossed only $38.7 million at the global box office. ║
║ – Chapter 2 remains shelved indefinitely by Warner Bros. ║
║ – The film became a surprise hit on Netflix, reaching the Top 3 chart. ║
║ – Costner has stated he wants to complete Chapters 3 and 4 back-to-back. ║
╚════════════════════════════════════════════════════════════════════╝When Did Horizon Land on Prime Video?
Costner’s epic western will stream on Prime Video beginning May 23, 2026. The film had previously been available on HBO Max, and this Prime Video debut marks the first time it has streamed outside of that platform.
This move is a significant step in expanding the film’s audience, especially after its underwhelming theatrical run. Despite the box office woes, Horizon: An American Saga – Chapter 1 managed to perform much better on streaming. When it dropped on Netflix earlier in 2025, it debuted at No. 3 on Netflix’s U.S. Top 10 chart, pulling in high viewership on the platform.
The Cast of Horizon: An American Saga – Chapter 1
The film features an ensemble cast consisting of Costner, Sienna Miller, Sam Worthington, and Giovanni Ribisi, with Jena Malone, Abbey Lee, Michael Rooker, Danny Huston, Luke Wilson, Isabelle Fuhrman, Jeff Fahey, Will Patton, Tatanka Means, Owen Crow Shoe, Ella Hunt, and Jamie Campbell Bower in supporting roles.
In the first installment of Costner’s Horizon franchise, he portrays a lone-wolf cowboy named Hayes Ellison.
Kevin Costner’s Massive Personal Investment
The passion project was largely financed by Costner himself, who put up a significant amount of his own money to get the film made, including funds from his personal assets and real estate holdings.
The $100 million budget across Chapters 1 and 2 places Horizon among the most expensive independent western productions ever made. Costner’s $38 million personal investment remains the largest individual contribution by any actor-director in recent memory.
This level of financial commitment underscores just how deeply Costner believes in this story — and how painful the theatrical disappointment must have been.
Box Office Disappointment — But a Streaming Comeback
Horizon: Chapter 1 premiered at the 77th Cannes Film Festival on May 19, 2024, and was theatrically released in the United States on June 28, 2024. The film received mixed reviews from critics and grossed $35 million worldwide, becoming a box-office disappointment.
With Chapter 1 released in June 2024 to a lowly $11 million opening at the box office, the film opened up to a brand-new audience on streaming. The film plays better as a glorified TV series in your home, explaining why it sits at the top of Netflix’s viewing charts.
The coming weeks will reveal whether Costner’s personal investment and creative commitment resonate with streaming audiences in ways theatrical distribution could not achieve.
What About Horizon: Chapter 2?
This is where things get complicated. Horizon: An American Saga – Chapter 2 was screened at the 40th Santa Barbara International Film Festival in February 2025. However, due to the poor box office performance of Chapter 1, the sequel has been put on hold indefinitely by New Line Cinema’s parent company, Warner Bros. Pictures.
According to a Warner Bros. source, a 2026 release in theaters for the second Horizon film is “not in the plans” at the studio. For the most part, the project has been “frozen.”
Chapter 2 carries a runtime of 190 minutes and had its world premiere at the Venice International Film Festival on September 7, 2024. Yet despite being a completed film, it has no confirmed release path at this time.
Costner’s Dream: Chapters 3 and 4
Despite the setbacks, Kevin Costner has not given up on his vision.
Costner has already shot nine days’ worth of footage on Chapter 3 but halted production due to lack of funds. He has expressed his desire to continue filming Chapters 3 and 4 back-to-back.
“The plan is, I’ve already shot a little bit of the third. And to perhaps shoot them back to back… I love the journey of this thing. It’s been the hardest thing I’ve ever done, but I love this movie. I love the second one — and the third one’s even harder than the first two, and the fourth one completes the story,” Costner shared.
At a Deadline Contenders panel in November 2024, Costner said: “I’m hoping, I’m dreaming, I’m meeting all the billionaires that we all hear about — they’re all hiding in the shadows.” His determination to finish the saga remains clearly undiminished.
Why You Should Watch Horizon on Prime Video Right Now
The Prime Video debut is arguably the best moment yet for new viewers to discover Horizon. Here’s why:
- Convenience: Already a Prime subscriber? No extra cost to stream.
- New audience: Prime Video reaches tens of millions of subscribers globally, giving the film its widest streaming reach yet.
- The Chapter 2 equation: The stronger Horizon performs on streaming, the more pressure it puts on Warner Bros. to release Chapter 2 — and potentially fund Chapters 3 and 4.
- Epic storytelling: At 181 minutes, Chapter 1 is an immersive, sweeping experience best enjoyed at home.
The film’s comeback demonstrates that streaming platforms offer different audience demographics than theatrical markets, and that failed films can recover through smart streaming strategies.
A Legacy Built on Westerns
The Academy Award winner is no stranger to the Western genre, after previously starring in 1985’s Silverado, 1990’s Dances with Wolves, and 1994’s Wyatt Earp. Horizon represents his most ambitious bet yet on the genre that has defined much of his legacy — and, win or lose commercially, it stands as a testament to the kind of grand, sweeping storytelling that rarely gets made in Hollywood anymore.
Final Thoughts
Horizon: An American Saga – Chapter 1 is finally on Prime Video, and now is the perfect time to give Kevin Costner’s passion project the viewing it deserves. With Chapter 2 stuck in limbo and Chapters 3 and 4 dependent on streaming success, every view genuinely matters. This isn’t just a movie — it’s a filmmaker betting everything on a story he believes in.
Have you watched Horizon yet? Drop your thoughts in the comments below — and if you’re a fan of Kevin Costner’s westerns, make sure to bookmark this page for all the latest updates on the saga’s future!
