Quickest Route from Hongqiao Airport to Pudong Airport

The fastest way to travel between the airports should be shuttle bus line 1, which takes around an hour. Besides, the comparative faster way should be subway line 2+Maglev (Maglev train from Longyang Road to PVG only takes around 8min, but subway line 2 takes around 40min.)

Thank you Henry. I was not aware that there was a shuttle bus between airports. Your information is very helpful!