diff --git a/src/features/online-board/components/OnlineBoardFilter.tsx b/src/features/online-board/components/OnlineBoardFilter.tsx
index 5daeb8f6..f5593b13 100644
--- a/src/features/online-board/components/OnlineBoardFilter.tsx
+++ b/src/features/online-board/components/OnlineBoardFilter.tsx
@@ -26,6 +26,12 @@ function minutesToTime(minutes: number): string {
   return `${String(h).padStart(2, "0")}:${String(m).padStart(2, "0")}`;
 }
 
+function minutesToHhmm(minutes: number): string {
+  const h = Math.floor(minutes / 60);
+  const m = minutes % 60;
+  return `${String(h).padStart(2, "0")}${String(m).padStart(2, "0")}`;
+}
+
 type AccordionTab = "flight" | "route";
 
 function dateToYyyymmdd(value: Date): string {
@@ -229,17 +235,25 @@ export const OnlineBoardFilter: FC<OnlineBoardFilterProps> = ({
       const arrCode = routeArrivalCode.trim().toUpperCase();
       if (!depCode && !arrCode) return;
 
+      // Only send time range when the user has narrowed the slider, so
+      // default 00:00–24:00 searches keep the URL clean (Angular spreads
+      // `...this.timeRange` which is undefined until interaction).
+      const timeExtras =
+        timeRange[0] !== 0 || timeRange[1] !== 1440
+          ? { timeFrom: minutesToHhmm(timeRange[0]), timeTo: minutesToHhmm(timeRange[1]) }
+          : {};
+
       let url: string;
       if (depCode && !arrCode) {
-        url = buildOnlineBoardUrl({ type: "departure", station: depCode, date: dateParam });
+        url = buildOnlineBoardUrl({ type: "departure", station: depCode, date: dateParam, ...timeExtras });
       } else if (!depCode && arrCode) {
-        url = buildOnlineBoardUrl({ type: "arrival", station: arrCode, date: dateParam });
+        url = buildOnlineBoardUrl({ type: "arrival", station: arrCode, date: dateParam, ...timeExtras });
       } else {
-        url = buildOnlineBoardUrl({ type: "route", departure: depCode, arrival: arrCode, date: dateParam });
+        url = buildOnlineBoardUrl({ type: "route", departure: depCode, arrival: arrCode, date: dateParam, ...timeExtras });
       }
       void navigate(`/${locale}/${url}`);
     },
-    [routeDepartureCode, routeArrivalCode, routeDate, navigate, locale],
+    [routeDepartureCode, routeArrivalCode, routeDate, timeRange, navigate, locale],
   );
 
   return (