de vez en cuando, de cuando en cuando

listen to the pronunciation of de vez en cuando, de cuando en cuando
Spanisch - Englisch
once in a while
Occasionally; sometimes

I send her a note once in a while to let her know I'm thinking of her.

now and then or here and there; "he was arrogant and occasionally callous"; "open areas are only occasionally interrupted by clumps of trees"; "they visit New York on occasion"; "now and again she would take her favorite book from the shelf and read to us"; "as we drove along, the beautiful scenery now and then attracted his attention"
occasionally, now and then, from time to time