FCO advice . most recently updated yesterday
Since coalition military action began in Yemen, missiles, unmanned aerial systems (drones) and water borne IEDs (WBIED) have periodically been launched into Saudi Arabia from Yemen, targeting critical national infrastructure, particularly aviation interests. Most of these have been intercepted and destroyed by Saudi air defence systems but there have been a small number of casualties and 3 fatalities. Facilities in Najran, Asir and Jazan provinces are likely to continue to be targeted but attacks may be made on other locations in Saudi Arabia too, including Riyadh and Jeddah, and over the Red Sea. On 12 June 2019, Abha International Airport was hit by a missile which resulted in twenty-six civilians being injured. On 14 June 2019 there were further drone attacks on Abha International Airport. There have been 6 intercepted missile attacks over Riyadh since the first missile attack on 4 November 2017, the most recent on 24 June 2018.
https://www.gov.uk/foreign-travel-advice/saudi-arabia