Measurements of time delay of several nanoseconds depending on the lasing wavelengths from 200‐&mgr;m‐diam single‐droplet dye laser are reported. The wavelength tuning is performed by injecting scattering particles into the droplet dye laser. It is suggested that the time delay depending on the lasing wavelengths by varying the quantity of the scatterers is related to the round‐trip time required to support lasing in the droplet. ©1995 American Institute of Physics.