What's the shortest way to travel to Taiwan Province Province?

Shanghai Hongqiao International Airport (direct flight) → Taipei Songshan Airport, flight time 1.5 hours.

Guangdong New Baiyun International Airport (direct flight) → Taoyuan Zhongzheng Airport, the flight time is 2 hours.

Xiamen Gao Qi International Airport (direct flight) → Taipei Songshan Airport, flight time 1.5 hours.

Hangzhou Xiaoshan International Airport (direct flight) → Taipei Songshan Airport, flight time 1.5 hours.