Wind tunnel measurements have been performed to investigate the effect of large scale turbulence on the laminar to turbulent transition on a natural laminar flow airfoil through cyclic 2D variations of the inflow angle. The investigated range of reduced frequencies is (corresponding to  Hz) and an equivalent angle of attack amplitude of . Transition locations are determined using the M-TERA intermittency method and time-dependent frequency spectra are calculated by a continuous wavelet transform. At high frequencies of inflow oscillation the downstream moving transition front is slower than the change in pressure gradient and the Tollmien-Schlichting peak is significantly reduced, indicating a “convective” transition mode. The downstream turning point of the transition location during the inflow angle cycle moves upstream for while the upstream turning point is essentially unchanged for .