ZIPAIR Tokyo, Delta, American, and United have round-trip flights from Houston (IAH) to Tokyo (NRT/HND) for $656-$894. Zipair flights August to October, NONSTOP. United flights August to September, NONSTOP. Delta flights August to April into Haneda, but have a connection.
Zipair fares are “cheaper” than other airlines, but have about +$200 dollars in fees if you decide to select a seat, eat a meal, and want more than just 15-lbs worth of carry-on.
United and Delta fares allow for a free carry-on, but have a fee for seat selection.
Delta and American fares fly into Haneda and have the most dates available.
The best deal will be the one that works best for your dates, routes, fee avoidance, and baggage allowance.