You can watch the movie Midsommar through several online platforms:

• It is available for streaming on Amazon Prime Video, including Amazon Prime Video with Ads

• You can rent or buy Midsommar on Amazon Video, Apple TV, Fandango At Home, and Microsoft Store. Rental prices start around $3.99, and buying the movie costs about $14.99 to $16.99, often in 4K quality with Dolby Atmos sound

• The movie is also available on Netflix in some regions, such as Thailand

• Additionally, you can watch Midsommar on Max streaming service in certain countries

For watching together remotely, some viewers use Amazon Prime's sync options or browser extensions like Teleparty to watch simultaneously with friends

. In summary, the most accessible way in the U.S. is Amazon Prime Video for streaming or digital purchase/rental on Amazon or Apple TV

. Availability may vary by country.