SpaceX's Falcon 9 rocket will deliver the BulgariaSat-1 satellite into a geostationary transfer orbit.
SpaceX will launch BulgariaSat-1 from Pad 39A at NASA's Kennedy Space Center in Florida during a two-hour launch window.
The satellite will be deployed approximately 35 minutes after launch.
BulgariaSat-1 is the first geostationary commercial communications satellite in Bulgaria's history.
The Falcon 9's first stage for BulgariaSat-1 previously supported the Iridium-1 mission from Vandenberg Air Force Base in January 2017.
Following separation, the Falcon 9 first stage will attempt a landing on the droneship "Of Course I Still Love You" in the Atlantic Ocean.