diff --git a/airflow/models/dag.py b/airflow/models/dag.py
index 2dc425daa0549..42a2181882d8a 100644
--- a/airflow/models/dag.py
+++ b/airflow/models/dag.py
@@ -3125,6 +3125,18 @@ def set_is_paused(self, is_paused: bool, session=NEW_SESSION) -> None:
     def dag_display_name(self) -> str:
         return self._dag_display_property_value or self.dag_id
 
+    @dag_display_name.expression  # type: ignore[no-redef]
+    def dag_display_name(self) -> str:
+        """
+        Expression part of the ``dag_display`` name hybrid property.
+
+        :meta private:
+        """
+        return case(
+            (self._dag_display_property_value.isnot(None), self._dag_display_property_value),
+            else_=self.dag_id,
+        )
+
     @classmethod
     @internal_api_call
     @provide_session
diff --git a/tests/api_fastapi/views/public/test_dags.py b/tests/api_fastapi/views/public/test_dags.py
index 5512f7bb13849..13520b37b3ff2 100644
--- a/tests/api_fastapi/views/public/test_dags.py
+++ b/tests/api_fastapi/views/public/test_dags.py
@@ -35,7 +35,6 @@
 DAG1_ID = "test_dag1"
 DAG1_DISPLAY_NAME = "display1"
 DAG2_ID = "test_dag2"
-DAG2_DISPLAY_NAME = "display2"
 DAG2_START_DATE = datetime(2021, 6, 15, tzinfo=timezone.utc)
 DAG3_ID = "test_dag3"
 TASK_ID = "op1"
@@ -99,7 +98,6 @@ def setup(dag_maker, session=None) -> None:
 
     with dag_maker(
         DAG2_ID,
-        dag_display_name=DAG2_DISPLAY_NAME,
         schedule=None,
         start_date=DAG2_START_DATE,
         doc_md="details",
@@ -150,7 +148,7 @@ def setup(dag_maker, session=None) -> None:
         ),
         # Search
         ({"dag_id_pattern": "1"}, 1, [DAG1_ID]),
-        ({"dag_display_name_pattern": "display2"}, 1, [DAG2_ID]),
+        ({"dag_display_name_pattern": "test_dag2"}, 1, [DAG2_ID]),
     ],
 )
 def test_get_dags(test_client, query_params, expected_total_entries, expected_ids):
@@ -239,7 +237,7 @@ def test_patch_dags(test_client, query_params, body, expected_status_code, expec
     "query_params, dag_id, expected_status_code, dag_display_name, start_date",
     [
         ({}, "fake_dag_id", 404, "fake_dag", datetime(2023, 12, 31, tzinfo=timezone.utc)),
-        ({}, DAG2_ID, 200, DAG2_DISPLAY_NAME, DAG2_START_DATE),
+        ({}, DAG2_ID, 200, DAG2_ID, DAG2_START_DATE),
     ],
 )
 def test_dag_details(test_client, query_params, dag_id, expected_status_code, dag_display_name, start_date):
@@ -309,7 +307,7 @@ def test_dag_details(test_client, query_params, dag_id, expected_status_code, da
     "query_params, dag_id, expected_status_code, dag_display_name",
     [
         ({}, "fake_dag_id", 404, "fake_dag"),
-        ({}, DAG2_ID, 200, DAG2_DISPLAY_NAME),
+        ({}, DAG2_ID, 200, DAG2_ID),
     ],
 )
 def test_get_dag(test_client, query_params, dag_id, expected_status_code, dag_display_name):