Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Surabaya to Thera as you normally would.
Related info for your journey
Useful info, stats and facts about Surabaya to Santorini flights.
SUB stands for Surabaya Juanda Airport, while JTR stands for Thera Santorini Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.