I've seen SEA-WAS in the ~$579 range 6-7 months out ... it's typically limited to one or two seats; then it jumps to ~$899 for one or two seats, then into four digits

that being said, I've also seen it revert to $709 a week out ... a $349 company-paid coach ticket means $360 out of pocket to upfare; that's a bit more than the $1/minute metric that DL regulars tend to espouse, but in the absence of all PC seats I've been ponying up