Measurements of the standard model Higgs boson decaying to a W boson pair are reported. The candidates are selected in events with an oppositely charged lepton pair and large missing transverse momentum, and with different numbers of jets. To select Higgs bosons produced via vector boson fusion and associated production with a W or Z boson, events with two jets and three or four leptons are also selected. The event sample corresponds to an integrated luminosity of 35.9~{\rm fb^{-1}}, collected in pp collisions at \sqrt{s} = 13~{\rm TeV} by the CMS detector at the LHC during 2016. Combining all the channels, the observed cross section times branching ratio is times the standard model prediction for the Higgs boson with a mass of 125.09~{\rm GeV}.