diff --git a/client/src/components/trans-routes/RouteEdit.js b/client/src/components/trans-routes/RouteEdit.js
index 2a29bfa..3277e09 100644
--- a/client/src/components/trans-routes/RouteEdit.js
+++ b/client/src/components/trans-routes/RouteEdit.js
@@ -208,7 +208,10 @@ const RouteEdit = () => {
 
       let data = Object.assign({}, currentRoute, {name: routeName, driver: newDriver, vehicle: newVehicle, type: newRouteType, route_customer_list: stabilizedCustomerList});
       if (estimatedStartTime && estimatedStartTime !== '') {
-        data = Object.assign({}, data, {estimated_start_time: combineDateAndTime(currentRoute.schedule_date, estimatedStartTime)})
+        data = Object.assign({}, data, {estimated_start_time: combineDateAndTime(currentRoute.schedule_date, estimatedStartTime)});
+      } else {
+        // Explicitly clear persisted value when user removes estimated start time.
+        data = Object.assign({}, data, {estimated_start_time: null});
       }
       let payload = { id: currentRoute?.id, data };
       if ((historyRoutes.find(item => item.id === params.id)) || (scheduleDate && new Date(data.schedule_date) > new Date())) {