“If already in the country, the Department of State urges U.S. citizens to depart Lebanon now while commercial options remain available. We urge U.S. citizens not to travel to Lebanon. The U.S. Embassy strongly encourages U.S. citizens in Southern Lebanon, near the borders with Syria, in refugee settlements, and in the Dahiyeh neighborhood of Beirut to depart those areas immediately. The commercial airport remains open and there is availability on commercial carriers, however flights may be cancelled at any time. Please check flight options at Beirut–Rafic Hariri International Airport.”
More information available at the US Embassy Beirut Website