Baltimore/Washington to Copenhagen $483 r/t

Air Canada, a member of Star Alliance, is offering r/t flights from Baltimore and Washington, D.C. for $483.

http://www.theflightdeal.com/2016/06/12/air-canada-483-washington-d-c-baltimore-copenhagen-denmark-roundtrip-including-all-taxes/

The example date is in November, I don’t know what other dates are available at this super-low price.