This depends on where you check in, your destination and how much baggage you have. Please allow at least 2 hours before departure at the airport for International flights during the holiday season and peak hours, as many are travelling. Remember that you also need to allow time to get through security control and walk to the gate.
See deadlines for check-in
If you are travelling on SAS charter flights, with flightnumber SK7000-7999.
Read more here about SAS charter