Originally Posted by
paperwastage
If end of March? Cherry blossom season, medium to high demand.
Don't forget about ToD/buy up, lowest ive seen for conusa-japan is $300 for PremPlus and $799 for Polaris one way, which makes the miles option not worth it.
Miles upgrade is usually 30k (PremPus) or 30k+$600(Polaris) one way
Good points re buyup. I've seen $300 premium plus buyups but not Polaris for that. Either way, still worth considering . . . and PP buyup *may* get you a fare that you can upgrade from further with higher priority.