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The B 203 begins in Büsum where it has connections to the ferry to Helgoland. The route continues eastwards to the city of Heide where it has connections to the B 5 and the A 23 motorway. The road continues further east until it reaches the city of Rendsburg where it has connections with the B 77, B 202 and the A 7 motorway. After leaving Rendsburg the route goes northeast to the city of Eckernförde where it crosses the B 76. The road continues further until it ends at the town of Kappeln with connections to the B 199 and the B 201.[1]