  The best way to probe CP violation in the lepton sector is with long-baseline
accelerator neutrino experiments in the appearance mode: the appearance of
$\nu_e$ in predominantly $\nu_\mu$ beams. Here we show that it is possible to
discover CP violation with disappearance experiments only, by combining JUNO
for electron neutrinos and DUNE or Hyper-Kamiokande for muon neutrinos. While
the maximum sensitivity to discover CP is quite modest ($1.6\sigma$ with 6
years of JUNO and 13 years of DUNE), some values of $\delta$ may be disfavored
by $>3\sigma$ depending on the true value of $\delta$.
