No flights are available between the two cities since there is no airport in Suzhou. If you would like to take flight, you are suggested to fly to Shanghai first and then take a bus or D train to Suzhou. It only takes about 30 to 40 minutes and the cost is about RMB31 by D train from Shanghai to Suzhou.

If you want to travel from hongkong to xiamen, I will suggest you travel to shenzhen first. And the just one and a half hour drive cheap shuttle services are avaialbale and from there you can take shenzhen airlines flight with five star services ensured on board.