Please be aware that Rome has multiple airports and that these results are for all airports serving the city.
The best month to arrive at Rome is January and the most expensive month to fly is December. (Average prices, based on 635 datapoints.)
The best day to arrive at Rome is Tuesday and it would be best to avoid Saturday, as prices are on average 47.85% higher than on Tuesday. (Average prices, based on 717 datapoints.)
The cheapest airline flying to Rome is Alitalia. They are 41% cheaper than Ethiopian Airlines. (Average prices, based on 642 datapoints.)