Please be aware that Tokyo and Shanghai has multiple airports and that these results are for all airports serving the city.
The best month to fly between Tokyo and Shanghai is August and the most expensive month to fly is January. (Average prices, based on 326 datapoints.)
The best day to arrive at Tokyo is Monday and it would be best to avoid Wednesday, as prices are on average 271.34% higher than on Monday. (Average prices, based on 216 datapoints.)
The cheapest airline flying from Tokyo to Shanghai is China Southern Airlines. They are 83% cheaper than All Nippon Airways. (Average prices, based on 340 datapoints.)
The best time to fly is at around 0. (Average prices, based on 410 datapoints.)