Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Charlotte to Nantes as you normally would.
There are currently 3+ open flights from Charlotte to Nantes within the next 7 days for less than $800.
On average you can expect to pay $6,162 for a flight from Charlotte to Nantes. The cheapest flight overall is $1,328 while the most popular route, (Charlotte Douglas - Nantes Atlantique) is currently priced at $766.