United Airlines is offering up a 15-25% award sale for economy class award travel between the US/Canada and Europe. The promotion is valid for travel between 11 January and 10 March 2016 and requires a round-trip or open-jaw itinerary; one-way and stopover bookings do not receive the discount. Travel on Monday-Thursday gets the higher 25% discount while Friday-Sunday get only 15%. Travel must be booked by 8 December 2015 to receive the discount.

Not quite as cheap as the AA off-peak awards to Europe and all segments must be operated by United Airlines which reduces flexibility somewhat. Still, it is a nice discount if you’re thinking about Europe anyways and can find the award space.
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In the first sentence, you mean to state “..travel between the US and Europe” (not “Canada”).
It is actually between US/Canada and Europe but either way I messed it up. Much more clear now, I hope.
Y only?
Yup.