A: Jiaxing-Shanghai train (Jiaxing Railway Station) or bus (West Bus Station).
The full price of the plane from Shanghai to Changchun is 1600, and the air ticket is 20% off.
20% discount for domestic Shanghai-Changchun 1600 320 One-way Shanghai Anxin Business Travel Co., Ltd.
20% discount for domestic Shanghai-Changchun 1600 320 One-way Shanghai Huacheng Business Travel Service Co., Ltd.
B: Air tickets from Hangzhou to Changchun.
Domestic Hangzhou-Changchun-60% discount 1750 telephone consultation one-way Hangzhou special ticket center.
According to the information on the Internet, I suggest you choose Jiaxing-Shanghai-Changchun route.