How early before a flight should one get to Arlanda Airport?
 

We have a 6:05 AM SAS flight from Arlanda to Munich on a Wednesday in late July.

Any suggestions as to how early we should be at the Airport?

Commonsense says two hours before an international flight. Google the airport's own website and see what they recommend.

That would be Terminal 5. You'll have to do everything by yourself, print your boarding card and baggage tags. At 6am in late July without business travellers it won't be too crowded. I'd arrive 20-30 minutes before boarding starts, but I'm familiar with the airport. 30-40 minutes should be enough for anyone.

I'd also be checking the SAS website and see what the airline recommends.