Ah, the good old 705 bus! This used to run like clockwork, on ten minute intervals, to get from Taoyuan HSR Station to the airport. But it appears that frequency has been cut back following the opening of the Taoyuan MRT:
Taoyuan International Airport a complete THSR shuttle bus routes network connecting the airport, Novotel Hotel, and THSR station, providing comfortable, convenient, low-cost and practical transportation option for travelers.
Ticket price: full fare NT$30, half fare NT$15.
Ticketing: Tickets sold at bus counters.
Intervals: 06:15-21:45 15-30 mins
21:45:22:50 20-40 mins
Trip length: 25 minutes.