Yes, the Samsung Galaxy S9 has a headphone jack

Samsung officially announced the Galaxy S9 today, and yes, as indicated by previously leaked images, there is a headphone jack. While many companies have opted out of including a headphone jack — the iPhone X, Pixel 2, and Huawei Mate 10 Pro — some, like Samsung, have continued to include the headphone jack and be... just fine.
Read more: http://www.theverge.com/platform/amp/circuitbreaker/2018/2/25/17046338/samsung-galaxy-s9-headphone-jack-leak-confirmed?source=Snapzu