How far is Chengdu airport terminal 1 and Terminal 2, i have a connecting flight from CTU - Mum.

There is about 10 to 15 minutes walking distance. Or you can choose to use the shuttle bus between the terminals.

At 00:30 there was no airport shuttle and we had to run for 15 minutes to catch a connecting flight at Terminal 1. Even more: They haven't checked our luggage to the final destination in Guangzhou so we had to pick up our cases in Chegdu and checked them again on terminal 1.
No one speaks english, no one knows anything about connecting flights, the signs are showing "connecting flights" but when you come to the gate there are "connecting flights" to Macau, HK and Taiwan.

The worst airport in China!!!
Good luck!