diff --git a/homeassistant/components/samsungtv/media_player.py b/homeassistant/components/samsungtv/media_player.py
index 5822bafcc55..7efdcdcd439 100644
--- a/homeassistant/components/samsungtv/media_player.py
+++ b/homeassistant/components/samsungtv/media_player.py
@@ -21,6 +21,7 @@ from homeassistant.components.media_player.const import (
 )
 from homeassistant.config_entries import SOURCE_REAUTH
 from homeassistant.const import CONF_HOST, CONF_MAC, CONF_NAME, STATE_OFF, STATE_ON
+from homeassistant.helpers import entity_component
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.device_registry import CONNECTION_NETWORK_MAC
 from homeassistant.helpers.script import Script
@@ -50,6 +51,13 @@ SUPPORT_SAMSUNGTV = (
     | SUPPORT_PLAY_MEDIA
 )
 
+# Since the TV will take a few seconds to go to sleep
+# and actually be seen as off, we need to wait just a bit
+# more than the next scan interval
+SCAN_INTERVAL_PLUS_OFF_TIME = entity_component.DEFAULT_SCAN_INTERVAL + timedelta(
+    seconds=5
+)
+
 
 async def async_setup_entry(hass, entry, async_add_entities):
     """Set up the Samsung TV from a config entry."""
@@ -148,7 +156,12 @@ class SamsungTVDevice(MediaPlayerEntity):
         """Return the availability of the device."""
         if self._auth_failed:
             return False
-        return self._state == STATE_ON or self._on_script or self._mac
+        return (
+            self._state == STATE_ON
+            or self._on_script
+            or self._mac
+            or self._power_off_in_progress()
+        )
 
     @property
     def device_info(self):
@@ -187,7 +200,7 @@ class SamsungTVDevice(MediaPlayerEntity):
 
     def turn_off(self):
         """Turn off media player."""
-        self._end_of_power_off = dt_util.utcnow() + timedelta(seconds=15)
+        self._end_of_power_off = dt_util.utcnow() + SCAN_INTERVAL_PLUS_OFF_TIME
 
         self.send_key("KEY_POWEROFF")
         # Force closing of remote session to provide instant UI feedback
diff --git a/tests/components/samsungtv/test_media_player.py b/tests/components/samsungtv/test_media_player.py
index 02eceeaacb7..2cdd5cf56df 100644
--- a/tests/components/samsungtv/test_media_player.py
+++ b/tests/components/samsungtv/test_media_player.py
@@ -419,6 +419,18 @@ async def test_state_without_turnon(hass, remote):
     assert await hass.services.async_call(
         DOMAIN, SERVICE_TURN_OFF, {ATTR_ENTITY_ID: ENTITY_ID_NOTURNON}, True
     )
+    state = hass.states.get(ENTITY_ID_NOTURNON)
+    # Should be STATE_UNAVAILABLE after the timer expires
+    assert state.state == STATE_OFF
+
+    next_update = dt_util.utcnow() + timedelta(seconds=20)
+    with patch(
+        "homeassistant.components.samsungtv.bridge.Remote",
+        side_effect=OSError,
+    ), patch("homeassistant.util.dt.utcnow", return_value=next_update):
+        async_fire_time_changed(hass, next_update)
+        await hass.async_block_till_done()
+
     state = hass.states.get(ENTITY_ID_NOTURNON)
     # Should be STATE_UNAVAILABLE since there is no way to turn it back on
     assert state.state == STATE_UNAVAILABLE