There is a mini fare war between Oneworld, SkyTeam and Star Alliance airlines for March 2017 departures to many cities in Denmark, Norway and Sweden priced from $402 to $450 round trip. Some cities are priced in $400s in April too.
Prices below are Google Flights links through airline’s website. Lower ticket prices might be found through Momondo.com or SkyScanner.com searches.
Denmark fares are lowest.
British Airways Los Angeles LAX – London LHR – Copenhagen CPH – LHR – LAX
United Airlines ticket for Air Canada flights
Los Angeles LAX – Toronto YYZ – Copenhagen CPH – YYZ – LAX
KLM Airlines LAX – Amsterdam AMS – Aalborg AAL – AMS – LAX