A flow splitter for distributing agricultural products may include a splitter body defining an inlet port and a plurality of outlet ports. The flow splitter may also include at least two baffle plates positioned within the splitter body so as to divide an internal flow chamber of the splitter body into a plurality of downstream flow channels. Additionally, the flow splitter may include a divider plate positioned within the splitter body upstream of the baffle plates such that the divider plate is spaced apart from upstream edges of the baffle plates in a direction of the inlet port of the splitter body. The divider plate may be configured to initially divide an input flow of agricultural product received at the input port into two separate product flows for subsequently delivery into the plurality of downstream flow channels.