There are mostly daily flights to the most popular and large islands. The smaller islands have a flight with a different island a few times a week. If you fly from the windward islands (Sal, Boavista, Sao Nicolau, Sao Vicente, Santo Antao) to one of the leeward islands (Santiago, Fogo, Brava and Maio) or visa versa, then you have a stopover on the largest island of the archipelago Santiago.