  We consider the possibility of solar neutrino decay as a sub-leading effect
on their propagation between production and detection. Using current
oscillation data, we set a new lower bound to the $\nu_2$ neutrino lifetime at
$\tau_2\, /\, m_2 \geq 7.2 \times 10^{-4}\,\,\hbox{s}\,.\,\hbox{eV}^{-1}$ at
$99\%\,$C.L.. Also, we show how seasonal variations in the solar neutrino data
can give interesting additional information about neutrino lifetime.
