Abstract Sea spray aerosol (SSA) emissions are an important source of natural aerosol particles, in particular over the remote Arctic Ocean. However, measurement data on SSA fluxes in the Arctic are sparse, such that these fluxes remain poorly constrained in atmospheric models. Utilizing simultaneous particle and turbulence measurements onboard the novel platform T‐Bird, we quantitatively derive size‐resolved SSA flux densities (dry diameter range 222–3,525 nm), representing the first airborne study on aerosol particle fluxes in the Arctic. In the accumulation mode size range, the measurements suggest roughly 100% higher emissions than predicted by commonly used sea salt generating functions. Our results constitute important information to evaluate model results, especially for the future Arctic, in which the magnitude of SSA fluxes is projected to increase as the sea ice retreats. Plain Language Summary Aerosol particles emitted from the ocean to the atmosphere by wind‐induced processes are an important component of the Arctic climate system. Quantifying these emissions is difficult such that corresponding data for the Arctic are sparse. We have successfully derived and quantified the rate of particle emission over the Arctic Ocean from airborne measurements for the first time. Our results may be used to assess the performance of atmospheric models in the Arctic, where more particles are expected to be emitted in the future as the sea ice melts due to global warming. Key Points The novel platform T‐Bird facilitates airborne studies on Arctic aerosol fluxes Fast size‐resolved particle measurements are essential to characterize sea spray aerosol (SSA) fluxes in the marine boundary layer Our results suggest higher emissions in the accumulation mode size range than several sea salt source functions often used in climate models