Plan to travel from Chengdu to Emeishan by high speed train (earliest train).

It is convenient to take high speed train from Chengdu East Railway station to Emeishan and only takes 1-2 hours on the way. You can reach the peak of mountain. You can take direct tourist bus from Emeishan to Leshan and it takes around 1 hour, so you can go there in December 25. Yes, you can take high speed train from Leshan to the airport.

There is a high-speed train station on the B1 floor of Chengdu airport. there are some high-speed trains to the Emeishan directly. If your time is available, you'd better take the train in this station. It can save about 1 hour compared with the Chengdu East train station.