There is a high-speed rail from Hsinchu to Taoyuan Airport, not direct, transfer at Taoyuan Station:<br/>High-speed rail + Tonglian Bus<br/>From Hsinchu, take the high-speed rail to Taoyuan Station, and then take Tonglian Bus 705 to Taoyuan Airport. <br/>It takes only one stop from Hsinchu to Taoyuan by high-speed rail, it only takes 10 minutes, and the fare is NT$140.<br/>I hope it can help you!