Understanding the mass-transfer kinetics of CO₂ in novel hybrid absorbents with physical and chemical contributions is essential for process design and evaluation. In this study, the liquid-side mass-transfer coefficients (k_L) and second-order reaction rate constants (k₂) of CO₂ in hybrid absorbents (namely, choline-2-pyrrolidine-carboxylic acid salt/polyethylene glycol/water ([Cho][Pro]/PEG200/H₂O)) were determined. The k_L values for the hybrid absorbents were obtained from the CO₂ diffusion coefficients (D_CO2) and the k_L values in PEG200/H₂O. The D_CO2 value was calculated from the density and viscosity of the hybrid absorbents, whereas the k_L values in PEG200/H₂O were measured experimentally. The k₂ values of CO₂ in the hybrid absorbents were estimated according to the reaction mechanism, the enhancement factor, and the k_L values, and compared with those of other commercialized absorbents. The results showed that 30 wt% [Cho][Pro]+70 wt% H₂O had the highest k_L and k₂ values at atmospheric pressure, whereas the values of k_L and k₂ of CO₂ in 30 wt% [Cho][Pro]/H₂O+PEG200 were comparable to those in diethanolamine aqueous and amino-functionalized ILs. The hybrid absorbent of [Cho][Pro]/PEG200/H₂O could be promising for CO₂ separation considering its thermodynamic and kinetic properties.