Since Disney acquired 20th Century Fox (which distributed Arrival internationally), the film often appears on Disney+ Hotstar in Southeast Asia.
You asked for "free." While premium services require subscriptions, they often offer free trials. arrival 2016 sub indo free
If you are a student or on a tight budget, check local libraries in major Indonesian cities (Jakarta, Surabaya, Bandung)—some have DVD collections with Indonesian subtitles. Since Disney acquired 20th Century Fox (which distributed
You can rent or buy Arrival on Apple TV. While renting might cost Rp 15.000 – 25.000, this is technically "very cheap" instead of "free," but it is 100% safe. If you are a student or on a