You can currently watch Spider-Man: No Way Home on Starz (including Starz Apple TV Channel, Starz Roku Premium Channel, and Philo) and on Hulu in the U.S.; it’s also available to rent or buy on Amazon Video, Apple TV Store, Fandango At Home, Spectrum On Demand, and Plex.

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Option Availability
Starz Streaming subscription
Hulu Streaming access in the U.S.
Apple TV Rent or buy
Amazon Video Rent or buy
Fandango At Home Rent or buy
Spectrum On Demand / Plex Rent
There are **no free streaming options** listed right now, according to the current availability data.

TL;DR: If you want to stream it now, start with Starz or Hulu ; if you just want to watch once, renting on Apple TV, Amazon, or Fandango is the easiest route.