SB 5.24.4
tato ’dhastat siddha-carana-vidyadharanam sadanani tavan matra eva.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Below Rahu by 10,000 yojanas [80,000 miles] are the planets known as Siddhaloka, Caranaloka and Vidyadhara-loka.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
It is said that the residents of Siddhaloka, being naturally endowed with the powers of yogis, can go from one planet to another by their natural mystic powers without using airplanes or similar machines.