A highly social creature, the White-throated Swift sleeps in roosts of hundreds of birds, typically in larger cavities in cliffs and large rocks. In the evening they gather above a roost, ascending beyond view and then descend as a group. With a swirling in front of the roost crack, individuals enter the roost several abreast. Occasionally one misses, bouncing off the entrance to rejoin the swirling mass.
The oldest recorded White-throated Swift was at least 10 years old when it was recaptured and rereleased during banding operations in California in 2006. It had been banded int he same state in 1997.