Yes they're both insufferably, tediously directed.

Completely forgot about that film. Didn't leave an impact, but now that you said it, there sure are some big similarities.

I was thinking the same thing. It also reminded me of the 1951 movie The Day the Earth Stood Still.

Yes, it definitely has some similarities and I wouldn't be surprised if the story was infleunced by the novel, but they are completely different stories. They certainly both deal with free will and non-linear time but Slaughterhouse-Five was more satirical while Arrival is more dramatic. It's just a case where two different stories have the same themes but tell a story in different ways.
My name is Darth Jar Jar. Master of the Drunken Force technique. All of you will be my slaves.

Glad I wasn't the only one! On top of that, the tralfamadorians in Slaughterhouse are visually described as beings shaped somewhat like hands. I thought that was another interesting similarity.

I was thinking the same thing. The "time travel" is exactly like in that book.