Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Singapore to Normandy as you normally would.
Related info for your journey
Useful info, stats and facts about Singapore to Normandy flights.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Singapore Changi Airport to Caen Carpiquet Airport flight would often be abbreviated as a SIN to CFR flight. Deauville St Gatien Airport (DOL), Rouen Airport (URO) are other airports near this flight route and their unique identifiers/IATA codes.