diff --git a/src/google/adk/agents/live_request_queue.py b/src/google/adk/agents/live_request_queue.py
index c9c7b82c685..e2f0581858a 100644
--- a/src/google/adk/agents/live_request_queue.py
+++ b/src/google/adk/agents/live_request_queue.py
@@ -57,6 +57,14 @@ class LiveRequest(BaseModel):
   activity_start > activity_end > blob > content. state_delta, if set, is always
   applied regardless of the other fields.
   """
+  audio_stream_end: Optional[bool] = None
+  """If set to True, signal that the audio stream has ended (e.g. microphone
+  turned off) to force flush buffered audio with VAD enabled.
+
+  When multiple fields are set, they are processed by priority (highest first):
+  activity_start > activity_end > audio_stream_end > blob > content.
+  state_delta, if set, is always applied regardless of the other fields.
+  """
   close: bool = False
   """If set, close the queue. queue.shutdown() is only supported in Python 3.13+."""
 
@@ -92,6 +100,10 @@ def send_activity_end(self) -> None:
     """Sends an activity end signal to mark the end of user input."""
     self._queue.put_nowait(LiveRequest(activity_end=types.ActivityEnd()))
 
+  def send_audio_stream_end(self) -> None:
+    """Sends an audio stream end signal to force flush buffered audio with VAD."""
+    self._queue.put_nowait(LiveRequest(audio_stream_end=True))
+
   def send(self, req: LiveRequest) -> None:
     self._queue.put_nowait(req)
 
diff --git a/src/google/adk/flows/llm_flows/base_llm_flow.py b/src/google/adk/flows/llm_flows/base_llm_flow.py
index 2a799d54ff3..ea2dddd78e4 100644
--- a/src/google/adk/flows/llm_flows/base_llm_flow.py
+++ b/src/google/adk/flows/llm_flows/base_llm_flow.py
@@ -827,6 +827,8 @@ async def _send_to_model(
         await llm_connection.send_realtime(types.ActivityStart())
       elif live_request.activity_end:
         await llm_connection.send_realtime(types.ActivityEnd())
+      elif live_request.audio_stream_end:
+        await llm_connection.send_realtime(True)
       elif live_request.blob:
         # Cache input audio chunks before flushing
         self.audio_cache_manager.cache_audio(
diff --git a/src/google/adk/models/gemini_llm_connection.py b/src/google/adk/models/gemini_llm_connection.py
index 66534b39fdc..717623bb8c7 100644
--- a/src/google/adk/models/gemini_llm_connection.py
+++ b/src/google/adk/models/gemini_llm_connection.py
@@ -29,7 +29,7 @@
 
 logger = logging.getLogger('google_adk.' + __name__)
 
-RealtimeInput = Union[types.Blob, types.ActivityStart, types.ActivityEnd]
+RealtimeInput = Union[types.Blob, types.ActivityStart, types.ActivityEnd, bool]
 from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:
@@ -173,6 +173,9 @@ async def send_realtime(self, input: RealtimeInput) -> None:
     elif isinstance(input, types.ActivityEnd):
       logger.debug('Sending LLM activity end signal.')
       await self._gemini_session.send_realtime_input(activity_end=input)
+    elif isinstance(input, bool) and input:
+      logger.debug('Sending LLM audio stream end signal.')
+      await self._gemini_session.send_realtime_input(audio_stream_end=True)
     else:
       raise ValueError('Unsupported input type: %s' % type(input))