Please be aware that Paris has multiple airports and that these results are for all airports serving the city.
The best month to arrive at Paris is May and the most expensive month to fly is September. (Average prices, based on 901 datapoints.)
The best day to arrive at Paris is Sunday and it would be best to avoid Monday, as prices are on average 35.7% higher than on Sunday. (Average prices, based on 836 datapoints.)
The cheapest airline flying to Paris is KLM. They are 72% cheaper than Air China. (Average prices, based on 943 datapoints.)
At Paris the most flights depart around 00:00. (Hourly flights, based on 953 datapoints.)