Lufthansa, along with several Star Alliance partners is running a fairly attractive fare sale from the east coast of the USA to Copenhagen for travel between November and February.
Most of Lufthansa’s fares are coming in around the $525 range for Newark departures. There are some minor variances that bring fares down to as low as $510 and as high as $650. Fares from JFK are $30-$80 higher than they are from Newark.
Other Star Alliance partner fares are showing SAS for as low as $497, Air Canada and United are in the low $500s.
There does not seem to be a pattern for fare validity. I found sample fares that were valid for 2 day trips all the way out to 2-3 month stays. Availability is widespread and relatively easy to find!
As this is an un-advertised fare special there are no specific terms or conditions that exist and I do not know how long the fares will be available at this rate.
What I do know is that these fares make it very easy to start planning ahead for the fantastic Christmas Markets that take place throughout Europe from late November through Christmas!