The border was closed for Greece (41.2).

Sweden is evaluated at regional level. The border closed for Gävleborgs län (35.5), Kalmar län (32.6) and Värmlands län (36.7).

Slesvig-Holsten is treated as a border area. Since Germany has too many infections, the region is assessed independently. Slesvig-Holsten was at 31.1, so the border was closed. People in Slesvig-Holsten, Skåne län, Blekinge län and Hallands län can enter Denmark if presenting a negative covid-19 test which is no more than 72 hours old.

The border is currently only open for residents of Estonia (20.5), Finland (24.9) and Norway (22.3) as well as two Swedish counties: Västerbottens län (24.8) and Västernorrlands län (17.3).

From what I can see, it is permitted to transit through a closed area, so you should be able to book UME-ARN-CPH or SDL-ARN-CPH if you live in an open area.

Denmark recommends against travel to Pohjanmaa (79.6) in Finland, Oslo (60.7) in Norway and Jõgeva Maakond (52.7) in Estonia. In practice, Danes can't travel to any of those places due to quarantine restrictions in Estonia and Norway and entry restrictions in Finland.