diff --git a/airflow/providers/google/cloud/transfers/gcs_to_bigquery.py b/airflow/providers/google/cloud/transfers/gcs_to_bigquery.py
index 88b6d09323708..709e6170b13e9 100644
--- a/airflow/providers/google/cloud/transfers/gcs_to_bigquery.py
+++ b/airflow/providers/google/cloud/transfers/gcs_to_bigquery.py
@@ -248,7 +248,7 @@ def __init__(
 
         # BQ config
         self.destination_project_dataset_table = destination_project_dataset_table
-        self.project_id = project_id
+        self.project_id = project_id if project_id is not None else self.hook.project_id
         self.schema_fields = schema_fields
         if source_format.upper() not in ALLOWED_FORMATS:
             raise ValueError(
@@ -575,7 +575,7 @@ def _create_empty_table(self):
         return table_obj_api_repr
 
     def _use_existing_table(self):
-        self.project_id, destination_dataset, destination_table = self.hook.split_tablename(
+        destination_project, destination_dataset, destination_table = self.hook.split_tablename(
             table_input=self.destination_project_dataset_table,
             default_project_id=self.project_id or self.hook.project_id,
             var_name="destination_project_dataset_table",
@@ -597,7 +597,7 @@ def _use_existing_table(self):
                 "autodetect": self.autodetect,
                 "createDisposition": self.create_disposition,
                 "destinationTable": {
-                    "projectId": self.project_id,
+                    "projectId": destination_project,
                     "datasetId": destination_dataset,
                     "tableId": destination_table,
                 },
diff --git a/tests/providers/google/cloud/transfers/test_gcs_to_bigquery.py b/tests/providers/google/cloud/transfers/test_gcs_to_bigquery.py
index 80958f281f630..1984d4b08831b 100644
--- a/tests/providers/google/cloud/transfers/test_gcs_to_bigquery.py
+++ b/tests/providers/google/cloud/transfers/test_gcs_to_bigquery.py
@@ -38,6 +38,7 @@
 TEST_EXPLICIT_DEST = "test-project.dataset.table"
 TEST_BUCKET = "test-bucket"
 PROJECT_ID = "test-project"
+OTHER_PROJECT_ID = "other-test-project"
 DATASET = "dataset"
 TABLE = "table"
 WRITE_DISPOSITION = "WRITE_TRUNCATE"
@@ -85,6 +86,7 @@ def test_max_value_external_table_should_execute_successfully(self, hook):
             schema_fields=SCHEMA_FIELDS,
             max_id_key=MAX_ID_KEY,
             external_table=True,
+            project_id=OTHER_PROJECT_ID
         )
 
         result = operator.execute(context=MagicMock())
@@ -93,7 +95,7 @@ def test_max_value_external_table_should_execute_successfully(self, hook):
         hook.return_value.create_empty_table.assert_called_once_with(
             exists_ok=True,
             location=None,
-            project_id=PROJECT_ID,
+            project_id=OTHER_PROJECT_ID,
             table_resource={
                 "tableReference": {"projectId": PROJECT_ID, "datasetId": DATASET, "tableId": TABLE},
                 "labels": {},
@@ -172,7 +174,7 @@ def test_max_value_without_external_table_should_execute_successfully(self, hook
                 job_id=pytest.real_job_id,
                 location=None,
                 nowait=True,
-                project_id=hook.return_value.split_tablename.return_value[0],
+                project_id=PROJECT_ID,
                 retry=DEFAULT_RETRY,
                 timeout=None,
             ),
@@ -233,7 +235,7 @@ def test_max_value_should_throw_ex_when_query_returns_no_rows(self, hook):
                 job_id=pytest.real_job_id,
                 location=None,
                 nowait=True,
-                project_id=hook.return_value.split_tablename.return_value[0],
+                project_id=PROJECT_ID
                 retry=DEFAULT_RETRY,
                 timeout=None,
             ),
@@ -316,6 +318,7 @@ def test_labels_without_external_table_should_execute_successfully(self, hook):
             schema_fields=SCHEMA_FIELDS,
             external_table=False,
             labels=LABELS,
+            project_id=PROJECT_ID
         )
 
         operator.execute(context=MagicMock())
@@ -342,7 +345,7 @@ def test_labels_without_external_table_should_execute_successfully(self, hook):
                 job_id=pytest.real_job_id,
                 location=None,
                 nowait=True,
-                project_id=hook.return_value.split_tablename.return_value[0],
+                project_id=PROJECT_ID
                 retry=DEFAULT_RETRY,
                 timeout=None,
             )
@@ -441,7 +444,7 @@ def test_description_without_external_table_should_execute_successfully(self, ho
                         fieldDelimiter=",",
                     ),
                 },
-                project_id=hook.return_value.split_tablename.return_value[0],
+                project_id=PROJECT_ID
                 location=None,
                 job_id=pytest.real_job_id,
                 timeout=None,
@@ -545,7 +548,7 @@ def test_source_objs_as_list_without_external_table_should_execute_successfully(
                 job_id=pytest.real_job_id,
                 location=None,
                 nowait=True,
-                project_id=hook.return_value.split_tablename.return_value[0],
+                project_id=PROJECT_ID
                 retry=DEFAULT_RETRY,
                 timeout=None,
             )
@@ -645,7 +648,7 @@ def test_source_objs_as_string_without_external_table_should_execute_successfull
                 job_id=pytest.real_job_id,
                 location=None,
                 nowait=True,
-                project_id=hook.return_value.split_tablename.return_value[0],
+                project_id=PROJECT_ID
                 retry=DEFAULT_RETRY,
                 timeout=None,
             )
@@ -842,7 +845,7 @@ def test_autodetect_none_without_external_table_should_execute_successfully(self
                         "encoding": "UTF-8",
                     }
                 },
-                project_id=hook.return_value.split_tablename.return_value[0],
+                project_id=PROJECT_ID
                 location=None,
                 job_id=pytest.real_job_id,
                 timeout=None,
@@ -1129,7 +1132,7 @@ def test_schema_fields_without_external_table_should_execute_successfully(self,
                 job_id=pytest.real_job_id,
                 location=None,
                 nowait=True,
-                project_id=hook.return_value.split_tablename.return_value[0],
+                project_id=PROJECT_ID
                 retry=DEFAULT_RETRY,
                 timeout=None,
             )