I think Japan is a very popular country to visit since it reopened, so fares and hotel rates aren’t going to be “cheap” anytime soon. We visited in December and are in Japan now, throughout all my searches past and for the future the fares have held. You can try to enter dat
es of travel on an app like Hopper to forecast when to buy or wait.
For Hawaii, low fares can be found however unless you stay at a Air BnB, hotel rat
es have also risen significantly post pandemic fyi