"Fourteen Huthis were killed in eight dawn air raids by the coalition on their positions near Dar Saad," a northern district of the port city of Aden, a loyalist army source told AFP.
In the nearby city of Daleh, fighters allied with fugitive President Abedrabbo Mansour Hadi attacked a Huthi position, killing six militants, said Southern Movement chief Nasser al-Shuaibi.
AFP could not immediately obtain independent confirmation, and the Huthis rarely acknowledge their losses.
Following the raid, some 300 fighters fled the base and deployed unopposed in the provincial capital of Ataq, where they raised Huthi flags after seizing local government and police installations, military sources said.
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Witnesses said tribesmen led by chief Hasan Banan, who is close to the Huthis, have cooperated with the rebels.
The World Health Organization says at least 643 people were killed and 2,226 wounded in fighting between March 19 and April 6.