British Airways is offering $250 off World Traveller Plus (premium economy) and $500 off business class round trips between North American gateways (New York, Boston, Chicago, Los Angeles, and Toronto) and a handful of cities in Europe (Amsterdam, Barcelona, Budapest, Frankfurt, London, Milan, Paris, Prague, Rome, and Vienna). Flights are available November 18th and January 4th and must be booked by October 20th. You must book through THIS LINK.
Fares are not particularly cheap (premium economy to London starts at about $1200 round trip after the discount; business class is about $2800, which is pretty reasonable ($500 more reasonable than anyone else). Fares are also valid on Iberia and American Airlines.
The nice thing is that these are discounts off of the actual lowest fares available (sometimes these types of deals are not applicable on the cheapest fare buckets).
This is a deal being offered in association with Jetsetter. You don’t need to be a Jetsetter member for this deal, but if you’d like to join Jetsetter, feel free to use my link.