Onsøy is a railway station located in Fredrikstad. The station is part of the Østfold Line, which connects Oslo with the Østfold region. Onsøy station was opened in 1879 and has since been an important transport hub for the local population.
The station serves both passenger and freight traffic, and has several daily departures to nearby cities and towns. Onsøy is equipped with necessary facilities for travelers, including waiting areas and ticket machines. The station is located in an area with good connections to local public transport, making it easy to get around from the station.