diff --git a/c3.js b/c3.js
index 51d9940..4dc0535 100644
--- a/c3.js
+++ b/c3.js
@@ -3943,6 +3943,7 @@
                     flowStart = getValueOnIndex(c3.data.targets[0].values, flowIndex),
                     flowEnd = getValueOnIndex(c3.data.targets[0].values, flowIndex + flowLength),
                     orgDomain = x.domain(),
+                    durationForFlow = options.flow.duration || duration,
                     wait = generateWait();
 
                 // remove head data after rendered
@@ -3961,7 +3962,7 @@
                 }
                 transform = 'translate(' + translateX + ',0) scale(' + scaleX + ',1)';
 
-                d3.transition().ease('linear').each(function () {
+                d3.transition().ease('linear').duration(durationForFlow).each(function () {
                     wait.add(axes.x.transition().call(xAxis));
                     wait.add(mainBar.transition().attr('transform', transform));
                     wait.add(mainLine.transition().attr('transform', transform));
@@ -4776,7 +4777,8 @@
             redraw({
                 flow: {
                     index: c3.data.targets[0].values[0].index,
-                    length: length
+                    length: length,
+                    duration: args.duration
                 },
                 withLegend: true
             });
diff --git a/c3.min.js b/c3.min.js
index 92bfc31..83a9ef8 100644
--- a/c3.min.js
+++ b/c3.min.js
@@ -1,3 +1,3 @@
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c(a)?nh:(nh=a,Mf(),nh)},hg.xgrids=function(a){return a?(Ei=a,Mf(),Ei):Ei},hg.xgrids.add=function(a){return a?hg.xgrids(Ei.concat(a)):void 0},hg.xgrids.remove=function(a){var b=eg(a);return hg.xgrids(Ei.filter(b))},hg.ygrids=function(a){return a?(Gi=a,Mf(),Gi):Gi},hg.ygrids.add=function(a){return a?hg.ygrids(Gi.concat(a)):void 0},hg.ygrids.remove=function(a){var b=eg(a);return hg.ygrids(Gi.filter(b))},hg.regions=function(a){return a?(oj=a,Mf(),oj):oj},hg.regions.add=function(a){return a?(oj=oj.concat(a),Mf(),oj):oj},hg.regions.remove=function(a){var b,c,d;return a=a||{},b=Xe(a,"duration",yg),c=Xe(a,"classes",[g.region]),d=hk.select("."+g.regions).selectAll(c.map(function(a){return"."+a})),(b?d.transition().duration(b):d).style("opacity",0).remove(),oj=oj.filter(function(a){var b=!1;return a.class?(a.class.split(" ").forEach(function(a){c.indexOf(a)>=0&&(b=!0)}),!b):!0})},hg.data.get=function(a){var b=hg.data.getAsTarget(a);return d(b)?b.values.map(function(a){return a.value}):void 0},hg.data.getAsTarget=function(a){var b=hg.data.targets.filter(function(b){return b.id===a});return b.length>0?b[0]:void 0},hg.data.names=function(a){return arguments.length?(Object.keys(a).forEach(function(b){lh[b]=a[b]}),Mf({withLegend:!0}),lh):lh},hg.data.colors=function(a){return arguments.length?(Object.keys(a).forEach(function(b){vh[b]=a[b]}),Mf({withLegend:!0}),vh):vh},hg.x=function(a){return arguments.length&&(Cc(hg.data.targets,a),Mf({withUpdateOrgXDomain:!0,withUpdateXDomain:!0})),hg.data.xs},hg.xs=function(a){return arguments.length&&(Dc(hg.data.targets,a),Mf({withUpdateOrgXDomain:!0,withUpdateXDomain:!0})),hg.data.xs},hg.axis.labels=function(a){arguments.length&&(Object.keys(a).forEach(function(b){hb(b,a[b])}),Jb())},hg.axis.max=function(a){arguments.length&&("object"==typeof a?(b(a.x)&&(ei=+a.x),b(a.y)&&(li=+a.y),b(a.y2)&&(ui=+a.y2)):li=ui=+a,Mf({withUpdateOrgXDomain:!0,withUpdateXDomain:!0}))},hg.axis.min=function(a){arguments.length&&("object"==typeof a?(b(a.x)&&(fi=+a.x),b(a.y)&&(mi=+a.y),b(a.y2)&&(vi=+a.y2)):mi=vi=+a,Mf({withUpdateOrgXDomain:!0,withUpdateXDomain:!0}))},hg.axis.range=function(a){arguments.length&&("undefined"!=typeof a.max&&hg.axis.max(a.max),"undefined"!=typeof a.min&&hg.axis.min(a.min))},hg.legend.show=function(a){_f(Pc(a)),Mf({withLegend:!0})},hg.legend.hide=function(a){ag(Pc(a)),Mf({withLegend:!0})},hg.resize=function(a){kg=a?a.width:null,lg=a?a.height:null,hg.flush(),hg.flush()},hg.flush=function(){Sf({withLegend:!0,withTransition:!1,withTransitionForTransform:!1})},hg.destroy=function(){hg.data.targets=void 0,hg.data.xs={},lk.classed("c3",!1).html(""),a.onresize=null},"url"in f.data)gg.xhr(f.data.url,function(a,b){var c,d=gg.csv.parseRows(b.response);1===d.length?(c=[{}],d[0].forEach(function(a){c[0][a]=null})):c=gg.csv.parse(b.response),Ef(c)});else if("rows"in f.data)Ef(Fc(f.data.rows));else{if(!("columns"in f.data))throw Error("url or rows or columns is required.");Ef(Gc(f.data.columns))}return hg},"function"==typeof define&&define.amd?define("c3",["d3"],f):"undefined"!=typeof exports&&"undefined"!=typeof module?module.exports=f:a.c3=f}(window);
\ No newline at end of file
diff --git a/htdocs/samples/api_flow.html b/htdocs/samples/api_flow.html
index 91b74a3..3e5da01 100644
--- a/htdocs/samples/api_flow.html
+++ b/htdocs/samples/api_flow.html
@@ -66,7 +66,8 @@
             ['data1', 500],
             ['data2', 100],
             ['data3', 200],
-          ]
+          ],
+          duration: 500
         });
       }, 1000);
 
@@ -76,7 +77,8 @@
             ['data1', 200],
 //            ['data2', 100],
             ['data3', 100]
-          ]
+          ],
+          duration: 150
         });
       }, 2000);