Taiwan Taoyuan International Airport: Take the Taoyuan Airport MRT to Taipei Main Station: the Express takes about 35–38 minutes and costs roughly NT$160 (NT$150 with EasyCard). Wait for the Express rather than taking the all-stops Commuter. Airport buses are cheaper at roughly NT$120–150 but take 50–70 minutes in traffic; use them only if they stop near your hotel. Note that the Airport MRT terminal is about a 300 m underground walk from Taipei Main Station’s city-MRT platforms.
Taipei Songshan Airport: This is the convenient downtown airport. Take the MRT Brown Line from Songshan Airport; Zhongxiao Fuxing is a few stops away, while Taipei Main Station requires a transfer and takes roughly 20–25 minutes. A metered taxi is sensible for central hotels, usually around 15–25 minutes depending on traffic. Do not tell a driver simply “Taipei airport” when you mean Taoyuan: Songshan and Taoyuan are very different airports.
Taipei Main Station: Taiwan High Speed Rail and conventional TRA trains arrive in the city’s main transport complex, with direct connections to the MRT Red and Blue lines and a walk to the Green line at Beimen. It is efficient but enormous; allow 10–15 minutes to find the correct exit or platform, more if transferring to the Airport MRT.