  We study holographic renormalization group flows from four-dimensional
$\mathcal{N}=2$ SCFTs to either $\mathcal{N}=2$ or $\mathcal{N}=1$ SCFTs. Our
approach is based on the framework of five-dimensional half-maximal
supergravity with general gauging, which we use to study domain wall solutions
interpolating between different supersymmetric AdS$_5$ vacua. We show that a
holographic RG flow connecting two $\mathcal{N}=2$ SCFTs is only possible if
the flavor symmetry of the UV theory admits an ${\rm SO}(3)$ subgroup. In this
case the ratio of the IR and UV central charges satisfies a universal relation
which we also establish in field theory. In addition we provide several general
examples of holographic flows from $\mathcal{N}=2$ to $\mathcal{N}=1$ SCFTs and
relate the ratio of the UV and IR central charges to the conformal dimension of
the operator triggering the flow. Instrumental to our analysis is a derivation
of the general conditions for AdS vacua preserving eight supercharges as well
as for domain wall solutions preserving eight Poincare supercharges in
half-maximal supergravity.
