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original posted at stackoverflow

library(circlize)

orig = c("IE","GB","US","ES","FI","US","IE","GB")
dest = c("FI","FI","ES","ES","US","US","US","IE")
direc = c("IB","OB","RETURN","DOM","OB","DOM","RETURN","IB")

df = data.frame(orig, dest, direc, stringsAsFactors = FALSE)

col = c("IB" = "red",
        "OB" = "blue",
        "RETURN" = "orange",
        "DOM" = "green")
directional = c("IB" = -1,
                "OB" = 1,
                "RETURN" = 2,
                "DOM" = 0)
diffHeight = c("IB" = -0.04,
                "OB" = 0.04,
                "RETURN" = 0,
                "DOM" = 0)
chordDiagram(df[1:2], col = col[df[[3]]], 
    directional = directional[df[[3]]], 
    direction.type = c("arrows+diffHeight"),
    diffHeight = diffHeight[df[[3]]])

legend("bottomleft", pch = 15, legend = names(col), col = col)