Saudi forces this year have reportedly shot down several missiles from the Yemeni rebels on multiple occasion and is now leading a military campaign against them.
A spokesman for the rebels said they fired a Burkan 2-H missile, a ballistic missile with a range of more than 500 miles.
Saudi Arabia's Al Ekhbariya TV said it was brought down north of King Khaled Airport.
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Saudi Arabia has intercepted a ballistic missile fired across the border from Yemen targeting the King Khaled airport in Riyadh. Earlier reports said there was an explosion at the airport.
Saudi military forces have intercepted missiles fired by Houthis several times since March 2015, when a Saudi-led coalition launched a war against the rebels and their allies after they captured northern Yemen and ousted the Saudi-backed president from power.
Al-Qahum was referring to airstrikes this past week on a hotel and a market area in Yemen's northern province of Saada.
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Iran is ideologically aligned with the Houthis and Saudi Arabia and other Sunni states in the region accuse it of supplying it with cash and weapons.
United Nations-backed talks have failed to broker a political settlement to end the fighting, which has left more than 8,600 people dead since the coalition intervened.
Rebels continue to hold much of Yemen and the United Nations has warned the country is on the brink of starvation.
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The Saudi-led coalition has also implemented an air and sea blockade on Yemen.