For travel booked by January 16 for travel January 27 through March 22, United is offering a discount of up to 25% on coach saver awards between the US and Europe or Central and Southern Africa.
A Saturday stay is required, and you can only get the discount on United flights using United miles and on Continental flights using Continental, though as they’re quick to point out you can freely transfer points back and forth between the two at will.
The discount is 20% for travel Thursday – Sunday and 25% for Monday – Wednesday, and you can do travel in one period in one direction and the othe period in the other direction, combinability is not an issue.
Open jaws are permitted within a region and the discount also applies to miles and money awards when those are available.
(HT: Online Travel Review)