In general, when looking for the cheapest flight to Nice, try to choose a flight departing in March for the best deal.
In general, most flyers find the cheapest time to book a flight to Nice is about 32 days prior.
From most locations, the cheapest flights to Nice are found on a Sunday. Booking a Thursday departure is usually the most expensive.
Typically, cheap prices to Nice are most often found for afternoon flights. Cheap prices are less likely for evening flights.