Eighteen aircraft will transfer people to third countries from safe sites outside Afghanistan, the Pentagon said.
Many thousands of Afghans are crowded outside Kabul airport, desperate to flee the country after the Taliban swept to power on 15 August.
President Joe Biden said on Sunday that the US had evacuated nearly 28,000 people in the past week.
"There is no way to evacuate this many people without pain and the heart-breaking images you see," Mr Biden told reporters at the White House, adding: "We have a long way to go and a lot can still go wrong."
