A long flight is one of the few times you have a legitimate excuse to watch something long, difficult, or completely unlike what you'd normally choose. The sci-fi twist that earns its place recontextualises the film's entire internal logic, suddenly the world the film built has different rules, and you have to recalibrate everything.
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Every sci-fi film on this list was chosen for tonight because it actually delivers. no safe picks, no obligation watches - just films that are worth watching. If one doesn't land, the next one will. Bookmark this and come back whenever the mood calls for it.
Not every film suits every mood, but these sci-fi were chosen precisely for a long flight. They end in a way you won't see coming, which makes them reliable picks rather than hopeful ones. If you enjoyed any of these, the related lists on this page will point you toward more films in the same spirit.