FBI: International‘s series finale would have worked better as a season finale. One of the biggest problems is that FBI: International‘s series finale left many questions unanswered. Throughout the season, Vo (Vinessa Vidotto) and Raines (Carter Redwood) competed for a GS-14 position that would force one of them to leave the Fly Team.
However, the FBI: International finale ended with the news that a decision had been reached, but did not share the result with the audience. Thus, the episode ended with the resolution of the story being a mystery.
These non-endings were even more frustrating because of the way the final episode was handled.
Similarly, the final scene was of Wes coming to America to introduce himself to his half-sister, but it was unclear if he was in the States for a visit or if he had quit the Fly Team. These non-endings were even more frustrating because of the way the final episode was handled.
Instead of the entire Fly Team working on a case together, Wes headed to Tokyo on his own while his team members only had cameos. This decision robbed the audience of one last adventure with the entire team, sparking outrage about the series’ ending.

The Showrunner Expected The Series To Continue
FBI: International co-creator Derek Haas recently addressed the cancelation, admitting (via TVLine) that he has “no insight into why it [FBI: International] was canceled.” Haas believed that FBI: International season 4 was particularly strong because of the inclusion of Soffer and of Station 19‘s Jay Hayden as Tyler Booth, stating that they were “gold together.“
While Haas has not commented specifically on the decision not to wrap up the series in the finale or the backlash against it, his comments provide insight into why he made those choices. Since Haas is confident that the cancelation has nothing to do with the show’s quality or ratings, it suggests that he was hoping another network would pick it up.
CBS Entertainment Chief Amy Reisenbach said in May (via TVLine) that, “…we have to be fiscally responsible, and ultimately those deals and the shows [the FBI shows] just weren’t penciling out for us from an economic perspective.” This statement suggests the reasons for the cancellation were mostly financial.
Sadly, CBS has made several such decisions, choosing not to renew popular shows such as the FBI spinoffs, Blue Bloods, and S.W.A.T. despite high ratings. Network TV has generally struggled financially in recent years, often leading to perplexing decisions.
In FBI: International‘s case, however, there might have been another reason. Both FBI spinoffs were canceled shortly after the announcement that CIA, which will be an off-shoot of the franchise, had been greenlit for the fall. CBS may have decided to cancel the other FBI spinoffs as part of an overhaul of the franchise.