The movie "Jeremiah Johnson" can be watched online by renting or buying on platforms like Amazon Video, Apple TV, and Fandango At Home. It is also available to stream for free on Fawesome and Tubi. Additionally, "Jeremiah Johnson" is available on HBO Max, although it may have regional restrictions. To summarize:

• Rent or buy on Amazon Video, Apple TV, Fandango At Home
• Stream for free on Fawesome and Tubi
• Available on HBO Max (may not be available in all countries)

This should give several options to watch "Jeremiah Johnson" depending on the preferred platform and location.