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SAS Airlines (Scandinavian Airlines) via Expedia have round trip airfares travelling from San Francisco (SFO) to Milan Italy (MXP) for $ 450, making 1 stop in Copenhagen Denmark. These are Go Light economy fares that only include a personal item. There is no seat selection and no carry-on bag allowance. However, there is free change if your travel plans change but fare difference applies.
When travelling internationally, always get up-to-date covid-19 travel restrictions as they change frequently. This include the stopover country.