American Airlines has round-trip flights from Dallas (DFW) to Tokyo (HND/NRT) for $699-$779, NONSTOP. Flights September to March. Departures on Monday, Tuesday, Wednesday, and Sunday. 10-day minimum stay required.
Main Cabin fares are $779 and allow for free changes.
COVID travel restrictions are still in place but this may work out for the dates later this year and next year.
American is no longer allowing free changes for Basic Economy fares. They still allow free changes for Main Cabin and higher classes.
Read More Nonstop Flights: Dallas to Tokyo $699-$779 r/t [September-March 2022] – American Airlines