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Tidal encounters in star clusters perturb discs around young protostars. InCuello et al. (2019a, Paper I) we detailed the dynamical signatures of astellar flyby in both gas and dust. Flybys produce warped discs, spirals withevolving pitch angles, increasing accretion rates, and disc truncation. Here wepresent the corresponding observational signatures of these features inoptical/near-infrared scattered light and (sub-) millimeter continuum and COline emission. Using representative prograde and retrograde encounters fordirect comparison, we post-process hydrodynamical simulations with radiativetransfer methods to generate a catalogue of multi-wavelength observations. Thisprovides a reference to identify flybys in recent near-infrared andsub-millimetre observations (e.g., RW Aur, AS 205, HV Tau & DO Tau, FU Ori,V2775 Ori, and Z CMa).

Flybys in protoplanetary discs: II. Observational signatures