Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Kuala Lumpur to Nantes as you normally would.
Related info for your journey
Useful info, stats and facts about Kuala Lumpur to Nantes flights.
Located just 8.3 km from the city centre, Nantes Atlantique is the airport most travellers will use when flying to Nantes from Kuala Lumpur. Booking flights from Kuala Lumpur to Nantes Atlantique (NTE) should be relatively easy as there are 0 daily inbound flights from Kuala Lumpur from 0 different airlines.
Kuala Lumpur Intl Airport is KUL and Nantes Atlantique Airport is NTE. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service. Kuala Lumpur Subang Airport (SZB), Malacca Batu Berendum Airport (MKZ) are other airports near this flight route and their unique identifiers/IATA codes.