Mamma Mia! Here We Go Again is a pretty awesome sequel. If you want to watch Watch Mamma Mia! Here We Go Again online free then here are a few options (we checked these as recently as February 2019):

 

  • Amazon Video (100% free for USA, UK & Canada) – The full movie is available on Amazon Video, and you can sign up for Amazon Prime Video completely free in 10 seconds and have access to Mamma Mia! Here We Go Again for free immediately (Amazon Prime users get Amazon Video access too), plus a whole bunch of bonus content.

Just cancel before the 30 days is over and you won’t pay anything. If you’re wanting to watch Mamma Mia! Here We Go Again for free and in high quality right now, then a free trial with Amazon Video is your best option.