The last subway line 2 departs at about 22:48 from Hongqiao railway station to Pudong airport.

Hi,Mr Ferguson,

You 'd better catch the metro line2 before 8PM at hongQiao stop.Though the Line 2's ends at around 10:45pm ,but the terminal is not the PuDong Airport(which ends at 9PM),it is the GuangLan Road.

So usually we take metroline 2 to PuDong airport,needs to transfer another train,which is also line 2 at "GuangLanlu" stop(the last metro is 9pm),then can go to the PVG airport directly.
So it will take you at least 1 hour to teh "GuangLan Lu",and another half an hour to the Pudong airport.

Wish it can help you.

Shirley