diff --git a/homeassistant/components/swiss_public_transport/sensor.py b/homeassistant/components/swiss_public_transport/sensor.py
index 8365afebaa7..0a69cf12085 100644
--- a/homeassistant/components/swiss_public_transport/sensor.py
+++ b/homeassistant/components/swiss_public_transport/sensor.py
@@ -156,4 +156,11 @@ class SwissPublicTransportSensor(SensorEntity):
             if not self._remaining_time or self._remaining_time.total_seconds() < 0:
                 await self._opendata.async_get_data()
         except OpendataTransportError:
-            _LOGGER.error("Unable to retrieve data from transport.opendata.ch")
+            self._attr_available = False
+            _LOGGER.warning(
+                "Unable to connect and retrieve data from transport.opendata.ch"
+            )
+        else:
+            if not self._attr_available:
+                self._attr_available = True
+                _LOGGER.info("Connection established with transport.opendata.ch")