Star Alliance airlines including United and Air Canada have Los Angeles, San Francisco and San Jose to Copenhagen tickets priced from $367 to $397 round trip for travel April to early June.
Google Flights pulls up fares as low as $422, but find dates and then search Momondo.com to find OTA sites selling tickets in the $300s.
$367 SFO – Copenhagen CPH April 30 – May 8
$381 SJC – Copenhagen CPH April 21- May 1
$396 LAX – Copenhagen CPH April 21-May 1
TravelMerry.com United Airlines codeshares for Air Canada operated flights
San Francisco SFO – Toronto YYZ (long layover) – Copenhagen CPH – YYZ – SFO
$366.82 round trip Mon Apr 30 – Tue May 8
