You can also view these on united.com, by going to "Book with Miles" and searching for a standard Economy award (as these are the most likely to be available). Then, mouse over the "show flight details" for your flight and look for availability in the NY (for 1K-reserved Saver economy space), XY (regular Saver economy), XC (Saver business, if applicable) and/or XF (Saver first) buckets. Your display options must be set to "Expert" in your profile, as detailed in the UA FAQ.