Well, I tend to think of any movie that takes place far enough in the future, or with any tech that is not available yet, as Science fiction. this is based on when the movie was made, of course... some of the tech implied in very early movies is here already, some isn't; and of course, early movies that set dates for their happenings would have already happened by now... but with these definitions in mind, and In order of which I would see before another...
any Star Trek - at all
Dune
Children of Dune
2001 A Space Odyssey
2010 (see above)
Star Wars; the whole set
The Last Star Fighter
Space Troopers
AI
Bicentennial Man
Blade Runner
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