In late Feb, I booked a saver C-class TPE-NRT-ORD-BDL award ~310 days in advance, for Jan 8 next year.

However in the BDL-ORD-NRT-TPE direction (which was actually my outbound direction) I was unable to get the NRT-TPE segment for Dec 19, about 290 days in advance...so I had to call in, and the agent got me a seat in SQ-C. Can't say I'm unhappy with that