The Sonic the Hedgehog movie is going to release here in the states on Nov. 8th, 2019. It's normal for movies to release slightly staggered around the world, and that seems to be the case for Europe. It seems that in various European countries, the release date is anywhere from later in November to late December.
Things get even crazier the more you look through the available information. According to IMDB, the film won't release in Japan until May 23rd, 2020, and New Zealand in July 2020! Now IMDB has certainly been a source of dubious information in the past, so we're not ready to call these release dates confirmed just yet. Let's hope we get some official information these release dates soon.