Please be aware that Osaka has multiple airports and that these results are only for International airport.
The best month to arrive at Osaka is October and the most expensive month to fly is January. (Average prices, based on 498 datapoints.)
The best day to arrive at Osaka is Sunday and it would be best to avoid Tuesday, as prices are on average 61.52% higher than on Sunday. (Average prices, based on 414 datapoints.)
The cheapest airline flying to Osaka is Japan Airlines. They are 29% cheaper than ANA Wings. (Average prices, based on 514 datapoints.)