King Khalid International was first targeted by Yemen's Houthis at around 3pm local time on Saturday (10 October). Further attacks followed on Sunday (11 October).
Thirteen people were killed and hundreds injured in the first strike on the terminal, the BBC reports, with the second claiming another life and causing further injury.
The Houthis, who are aligned with Iran, have claimed responsibility for the attacks and others on other airports in Saudi Arabia. They have warned airlines and passengers against using the country's airports and airspace, according to the BBC.
The FCDO is advising against all but essential travel to Riyadh province, Aseer province, Najran province and Jizan province, and the cities of Jeddah, Damman and Taif.
In addition, it is advising against all but essential travel to all of Saudi Arabia's airports, with the exception of Medina International airport.
British nationals seeking to leave the country are advised to consider travelling by land to one of Saudi Arabia's Gulf neighbours, including Bahrain, Kuwait, the United Arab Emirates or Jordan.
The FCDO said the Houthis have been targeting locations in Saudi Arabia with missiles and drones since mid-July, adding "further attacks against airports are very likely".
"Following a serious incident at King Khalid International airport on 10 October 2026 at approximately 1500 (local time), we advise British nationals to avoid King Khalid International airport until the airport is secure and to monitor the advice of the Saudi authorities," said the FCDO in an update to its travel advice issued on Sunday.
Saudi Arabia's civil aviation body has extended an existing suspension of operations at Riyadh's airport following the attacks, and is yet to advise if and when operations will resume.
Saudi carrier Riyadh Air, which operated its first flight to Manchester airport last month and also flies to and from Heathrow, has cancelled nearly 30 flights that had been due to operate on Monday (12 October), including RX401 to Heathrow and RX402 in return, and a further three on Tuesday (13 August).
It follows the closure of King Khalid International airport. Passengers are advised not to travel to their departure airport until further. Riyadh Air is allowing guests due to travel to rebook their journey for free within the next 21 days, or request a full refund.