diff --git a/lib/matplotlib/testing/__init__.py b/lib/matplotlib/testing/__init__.py
index eff079efe887..f430b0609644 100644
--- a/lib/matplotlib/testing/__init__.py
+++ b/lib/matplotlib/testing/__init__.py
@@ -92,6 +92,13 @@ def subprocess_run_for_testing(command, env=None, timeout=60, stdout=None,
     """
     if capture_output:
         stdout = stderr = subprocess.PIPE
+    # Add CREATE_NO_WINDOW flag on Windows to prevent console window overhead
+    # This is added in an attempt to fix flaky timeouts of subprocesses on Windows
+    if sys.platform == 'win32':
+        if 'creationflags' not in kwargs:
+            kwargs['creationflags'] = subprocess.CREATE_NO_WINDOW
+        else:
+            kwargs['creationflags'] |= subprocess.CREATE_NO_WINDOW
     try:
         proc = subprocess.run(
             command, env=env,