There are no direct flights Copenhagen to Singapore:

Flights Copenhagen to Singapore with 1 stopover:

Flights via  Dubai (DXB), UAE
From Copenhagen (CPH), Denmark with Emirates Transfer at Dubai (DXB), UAE Then on to Singapore Changi (SIN), Singapore with Emirates
Flights via Istanbul Ataturk (IST), Turkey
From Copenhagen (CPH), Denmark with Turkish Airlines Transfer at Istanbul Ataturk (IST), Turkey Then on to Singapore Changi (SIN), Singapore with Turkish Airlines
Flights via Frankfurt am Main (FRA), Germany
From Copenhagen (CPH), Denmark with Singapore Airlines
OR
From Copenhagen (CPH), Denmark with Lufthansa
Transfer at  Frankfurt am Main (FRA), Germany Then on to Singapore Changi (SIN), Singapore with Singapore Airlines
OR
Singapore Changi (SIN), Singapore with Lufthansa
Flights via Amsterdam (AMS), Netherlands
From Copenhagen (CPH), Denmark with KLM Transfer at Amsterdam (AMS), Netherlands Then on to Singapore Changi (SIN), Singapore with KLM
Flights via Paris Charles de Gaulle (CDG), France
From Copenhagen (CPH), Denmark with Air France Transfer at Paris Charles de Gaulle (CDG), France Then on to Singapore Changi (SIN), Singapore with Air France
Flights via Bangkok Suvarnabhumi (BKK), Thailand
From Copenhagen (CPH), Denmark with SAS
OR
From Copenhagen (CPH), Denmark with Thai Airways
Transfer at Bangkok Suvarnabhumi (BKK), Thailand Then on to Singapore Changi (SIN), Singapore with SAS
OR
Then on to Singapore Changi (SIN), Singapore with Thai Airways
Flights via Helsinki Vantaa (HEL), Finland
From Copenhagen (CPH), Denmark with Finnair Transfer at Helsinki Vantaa (HEL), Finland Then on to Singapore Changi (SIN), Singapore with Finnair
Flights via Beijing Capital (PEK), China
From Copenhagen (CPH), Denmark with Air China Transfer at Beijing Capital (PEK), China Then on to Singapore Changi (SIN), Singapore with Air China
Flights via London Heathrow (LHR), United Kingdom
From Copenhagen (CPH), Denmark with British Airways
OR
From Copenhagen (CPH), Denmark with Qantas
Transfer at London Heathrow (LHR), United Kingdom Then on to Singapore Changi (SIN), Singapore with British Airways
OR
Then on to Singapore Changi (SIN), Singapore with Qantas
Flights via Zurich (ZRH), Switzerland
From Copenhagen (CPH), Denmark with Swiss Transfer at Zurich (ZRH), Switzerland Then on to Singapore Changi (SIN), Singapore with Swiss
Flights via  Doha (DOH), Qatar
From Copenhagen (CPH), Denmark with Qatar Airways Transfer at Doha (DOH), Qatar Then on to Singapore Changi (SIN), Singapore with Qatar Airways
Flights via Cairo (CAI), Egypt
From Copenhagen (CPH), Denmark with EgyptAir Transfer at Cairo (CAI), Egypt Then on to Singapore Changi (SIN), Singapore with EgyptAir