There are two airlines offering flights to Shanghai. The most direct route isn’t necessarily the cheapest – being flexible is key to finding the lowest airfare rates. For example, try searching by month to see the best time of the week to fly. The cheapest date is currently 02 / Apr / 2019.
You can use the filters on your search to see more flights and find cheaper rates – Shanghai has more than one airport. So if you don't need to fly into Shanghai Pu Dong Airport, it's worth checking your other options. The 9188 km flight usually takes about 19 hrs 10 mins.
You can expect accommodation prices to be higher at this time of year too. Last-minute deals do crop up, but it's best to book everything in advance to avoid disappointment.