There are some impressive low fares with Star Alliance airlines out of San Francisco SFO, San Jose SJC and Los Angeles LAX. The better deals appear to be San Francisco and San Jose departures. SFO to Stockholm is as low as $375 on the United Airlines website for departures next October and November.
Deals are showing up directly on United Airlines website with mostly Air Canada, Lufthansa, Swiss Airlines and United operated flights transatlantic. SAS is not participating in the transatlantic flight segments, but does offer some intra-Europe connections.
Air Canada has fares in low $400s to low $500s for Munich, Frankfurt, Zurich, Geneva, Barcelona, Copenhagen.
There are low fare deals available for Thanksgiving week travel to several airports across Europe.
United Airlines ticket SFO to Copenhagen
Air Canada operated flights outbound, SAS for Copenhagen, Denmark to London on the return connecting to United nonstop to San Francisco.
United Airlines SFO – Toronto YYZ – Copenhagen CPH – London LHR – SFO
Lufthansa Airlines SFO – Munich MUC – Stockholm ARN – Zurich ZRH – San Francisco SFO
United Airlines SFO – London LHR – Geneva, Switzerland GVA – Montreal YUL – SFO