'The Expanse' Season 6 on Amazon Release Date, Cast, Trailer, Plot On 2/3/21 at 7:59 AM EST The Expanse may have only just finished airing on Amazon Prime Video, but the show has already been renewed for Season 6. However, the sixth season, which is expected to be released this year, is set to be the show's last according to Amazon, who have started to reveal hints about the upcoming installment's cast and plot. When is The Expanse Season 6 out? No official release date has been announced yet for The Expanse Season 6. However, the previous two seasons on Amazon Prime came out in December, so a likely release date is December 2021, when the final 10 episodes are expected to start airing weekly.