It varies by key, just like with major keys. There can be as few as one flat (D minor) or all seven flats (A-flat minor). Minor keys can have sharps too.
The F minor scale has four flats.
A flat major and its relative minor are key signatures with four flats.
It depends on which key you are referring to, all the keys with flats are: F major (1 flat) B-flat major (2 flats) E-flat major (3 flats) A-flat major (4 flats) D-flat major (5 flats) G-flat major (6 flats) C-flat major (7 flats) Likewise the relative minors are: D minor (1 flat) G minor (2 flats) C minor (3 flats) F minor (4 flats) B-flat minor (5 flats) E-flat minor (6 flats) A-flat minor (7 flats)
The key of B flat major, or g G minor, has two flats. The flats are B flat and E flat.
The key of G-sharp minor has 5 sharps (it's the relative to B major). G-flat minor is a key that only exists in theory, because that key signature would contain 9 flats. The limit on flats or sharps in a key is 7.
The F minor scale has four flats.
D flat major is the major key with five flats and b flat minor is the minor key with five flats.
C Major, zero flats and zero sharps. The minor scale with the same number of flats and sharps is A Minor.
The key of C major or A minor.
A flat major and its relative minor are key signatures with four flats.
C Major, zero flats and zero sharps. The minor scale with the same number of flats and sharps is A Minor.
There are no flats in Em, just an F sharp!
If there are 4 flats in the key signature it means the key is either Ab Major or F minor.
The keys of C major and A minor have no sharps or flats.
C Major, zero flats and zero sharps. The minor scale with the same number of flats and sharps is A Minor.
The keys of Eb Major and c minor have three flats in their key signatures: Bb, Eb, and Ab.
C Major, zero flats and zero sharps. The minor scale with the same number of flats and sharps is A Minor.