Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Surabaya to Normandy as you normally would.
Surabaya Juanda (SUB), located 15.0 km from the city centre, is the airport you fly out of when you book flights from Surabaya to Normandy.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Surabaya Juanda Airport to Caen Carpiquet Airport flight would often be abbreviated as a SUB to CFR flight. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Deauville St Gatien Airport (DOL), Rouen Airport (URO), Le Havre – Octeville Airport (LEH).