F-16 fighter jets destroyed fuel and ammunition depots in the remote Hakkari province, on the border with Iraq, the general staff said in a statement on its website.
"Five terrorists have been neutralised," the army added.
The sortie was the second in under a week, coming five days after the air force strafed PKK targets across the border in the mountains of northern Iraq, in an operation that killed at least 55 militants, according to the military.
The attack came after the government on Saturday announced plans to boost the controversial Kurdish militia by 5,000 members in the run-up to November 1 parliamentary elections.
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Ankara launched a major "anti-terrorist" campaign against the PKK in late July, aimed at flushing it out of its strongholds in southeastern Turkey and northern Iraq.
The group has hit back hard, killing dozens of police and soldiers in almost daily bomb and shooting attacks.
The escalation has shattered a two-year-ceasefire which had raised hopes of an end to the PKK's three-decade insurgency, in which over 40,000 people have been killed.