diff --git a/src/features/online-board/components/OnlineBoardDetailsPage.test.tsx b/src/features/online-board/components/OnlineBoardDetailsPage.test.tsx
index 5faba627..ebf3157d 100644
--- a/src/features/online-board/components/OnlineBoardDetailsPage.test.tsx
+++ b/src/features/online-board/components/OnlineBoardDetailsPage.test.tsx
@@ -9,7 +9,7 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import { render, screen } from "@testing-library/react";
 import { OnlineBoardDetailsPage } from "./OnlineBoardDetailsPage.js";
-import type { IParsedFlightId, IDirectFlight } from "../types.js";
+import type { IParsedFlightId, IDirectFlight, IMultiLegFlight, IFlightLeg } from "../types.js";
 
 const mockFlightId: IParsedFlightId = {
   carrier: "SU",
@@ -75,8 +75,8 @@ const mockFlight: IDirectFlight = {
 
 // Mutable state for test control
 let mockState = {
-  flight: mockFlight as IDirectFlight | null,
-  allFlights: [mockFlight] as IDirectFlight[],
+  flight: mockFlight as IDirectFlight | IMultiLegFlight | null,
+  allFlights: [mockFlight] as (IDirectFlight | IMultiLegFlight)[],
   daysOfFlight: ["20250115"] as string[],
   loading: false,
   error: null as Error | null,
@@ -273,6 +273,70 @@ describe("OnlineBoardDetailsPage", () => {
     });
   });
 
+  describe("multi-leg timeline integration", () => {
+    function makeLeg(index: number, overrides: Partial<IFlightLeg> = {}): IFlightLeg {
+      return {
+        ...mockFlight.leg,
+        index,
+        ...overrides,
+      } as IFlightLeg;
+    }
+
+    it("does not render FullRouteTimeline for Direct flights", () => {
+      render(
+        <OnlineBoardDetailsPage flightId={mockFlightId} locale="ru" canonicalOrigin="https://example.com" />,
+      );
+      expect(screen.queryByTestId("full-route-timeline")).toBeNull();
+      expect(screen.queryByTestId("transfer-bar")).toBeNull();
+    });
+
+    it("renders FullRouteTimeline for MultiLeg flights", () => {
+      const multiLeg: IMultiLegFlight = {
+        id: "SU100-20250115",
+        flightId: { carrier: "SU", flightNumber: "100", suffix: "", date: "20250115" },
+        routeType: "MultiLeg",
+        status: "Scheduled",
+        flyingTime: "12:00",
+        operatingBy: {},
+        legs: [makeLeg(0), makeLeg(1)],
+      };
+      mockState = {
+        flight: multiLeg,
+        allFlights: [multiLeg],
+        daysOfFlight: ["20250115"],
+        loading: false,
+        error: null,
+      };
+      render(
+        <OnlineBoardDetailsPage flightId={mockFlightId} locale="ru" canonicalOrigin="https://example.com" />,
+      );
+      expect(screen.getByTestId("full-route-timeline")).toBeTruthy();
+    });
+
+    it("interleaves one TransferBar between two legs", () => {
+      const multiLeg: IMultiLegFlight = {
+        id: "SU100-20250115",
+        flightId: { carrier: "SU", flightNumber: "100", suffix: "", date: "20250115" },
+        routeType: "MultiLeg",
+        status: "Scheduled",
+        flyingTime: "12:00",
+        operatingBy: {},
+        legs: [makeLeg(0), makeLeg(1)],
+      };
+      mockState = {
+        flight: multiLeg,
+        allFlights: [multiLeg],
+        daysOfFlight: ["20250115"],
+        loading: false,
+        error: null,
+      };
+      render(
+        <OnlineBoardDetailsPage flightId={mockFlightId} locale="ru" canonicalOrigin="https://example.com" />,
+      );
+      expect(screen.getAllByTestId("transfer-bar")).toHaveLength(1);
+    });
+  });
+
   describe("flight schedule integration", () => {
     it("renders FlightSchedule when firstLeg.daysOfWeek is present", () => {
       const flightWithDaysOfWeek = {
diff --git a/src/features/online-board/components/OnlineBoardDetailsPage.tsx b/src/features/online-board/components/OnlineBoardDetailsPage.tsx
index 306e2210..8bb4e991 100644
--- a/src/features/online-board/components/OnlineBoardDetailsPage.tsx
+++ b/src/features/online-board/components/OnlineBoardDetailsPage.tsx
@@ -7,7 +7,7 @@
  * @module
  */
 
-import { useCallback, type FC } from "react";
+import { Fragment, useCallback, type FC } from "react";
 import { useNavigate } from "@modern-js/runtime/router";
 import { useTranslation } from "@/i18n/provider.js";
 import "./OnlineBoardDetailsPage.scss";
@@ -28,6 +28,8 @@ import { DayTabs } from "./DayTabs/index.js";
 import { BoardDetailsHeader } from "./BoardDetailsHeader/index.js";
 import { DetailsBackButton } from "./DetailsBackButton/index.js";
 import { FlightSchedule } from "./FlightSchedule/index.js";
+import { FullRouteTimeline } from "./FullRouteTimeline/index.js";
+import { TransferBar } from "./TransferBar/index.js";
 import type { IParsedFlightId, IFlightLeg } from "../types.js";
 
 export interface OnlineBoardDetailsPageProps {
@@ -41,12 +43,20 @@ export interface OnlineBoardDetailsPageProps {
 
 /**
  * Render all legs of a flight with departure/arrival station details.
+ * For multi-leg flights, interleaves a TransferBar between consecutive legs.
  */
-function FlightLegs({ legs }: { legs: IFlightLeg[] }): JSX.Element {
+function FlightLegs({
+  legs,
+  viewType,
+}: {
+  legs: IFlightLeg[];
+  viewType: "Onlineboard" | "Schedule";
+}): JSX.Element {
   return (
     <div className="flight-details__legs" data-testid="flight-legs">
-      {legs.map((leg) => (
-        <div key={leg.index} className="flight-details__leg" data-testid={`flight-leg-${leg.index}`}>
+      {legs.map((leg, i) => (
+        <Fragment key={leg.index}>
+        <div className="flight-details__leg" data-testid={`flight-leg-${leg.index}`}>
           <div className="flight-details__leg-header">
             <span className="flight-details__leg-index">Leg {leg.index + 1}</span>
             <span className="flight-details__leg-status">{leg.status}</span>
@@ -124,6 +134,10 @@ function FlightLegs({ legs }: { legs: IFlightLeg[] }): JSX.Element {
           )}
           <FlightDetailsAccordion leg={leg} viewType="Onlineboard" />
         </div>
+        {i < legs.length - 1 && (
+          <TransferBar leg={leg} nextLeg={legs[i + 1]!} viewType={viewType} />
+        )}
+        </Fragment>
       ))}
     </div>
   );
@@ -278,6 +292,10 @@ export const OnlineBoardDetailsPage: FC<OnlineBoardDetailsPageProps> = ({
 
           <BoardDetailsHeader flight={displayFlight} locale={locale} />
 
+          {displayFlight.routeType === "MultiLeg" && (
+            <FullRouteTimeline legs={displayFlight.legs} viewType="Onlineboard" />
+          )}
+
           {/* Summary card */}
           <FlightCard flight={displayFlight} />
 
@@ -292,7 +310,7 @@ export const OnlineBoardDetailsPage: FC<OnlineBoardDetailsPageProps> = ({
           )}
 
           {/* Detailed leg information */}
-          <FlightLegs legs={legs} />
+          <FlightLegs legs={legs} viewType="Onlineboard" />
 
           {/* Flying time */}
           <div className="flight-details__flying-time" data-testid="flying-time">