At present, all road transport to and from Jiuzhaigou are banned due to the rains in Sichuan Province, you can flight to Jiuzhaigou but I think you'd better make a trip to Songpan in next time since the roads are not in good condition. Keep noticing the weather forecast in this area to see if it is suitable for traveling.

Thank you for your answer. So the roads from the airport to Jiuzhaigou national park are closed too or only the roads from jiuzhaigou park to songpan?

Thank you