Please be aware that Osaka and Tokyo has multiple airports and that these results are for all airports serving the city.
The best month to fly between Osaka and Tokyo is September and the most expensive month to fly is January. (Average prices, based on 1199 datapoints.)
The best day to arrive at Osaka is Wednesday and it would be best to avoid Friday, as prices are on average 46.28% higher than on Wednesday. (Average prices, based on 1215 datapoints.)
The cheapest airline flying from Osaka to Tokyo is Peach Aviation. They are 51% cheaper than ANA Wings. (Average prices, based on 1232 datapoints.)
The best time to fly is at around 13. (Average prices, based on 2377 datapoints.)