The cheapest Rome to Tokyo Haneda return flight on the radar right now is €597, flying with Air China via one or more connections. It covers departures in January 2027, and every dated link below opens that exact FCO–HND search on Skyscanner. Across 92 recorded checks it has ranged between €594 and €943. Our sampling points to January 2027 as the cheapest month to fly Rome to Tokyo Haneda.
Prices are re-checked against Skyscanner automatically, and every one shows when it was last confirmed, so nothing here is older than it looks. Not flying from Rome? We track 62 other departure cities for Tokyo Haneda, listed at the foot of this page.
Prices like this tend to vanish fast. If it has gone when you look, try the days either side of the dates above, since Rome to Tokyo Haneda is often still worth booking within a day or two of the fare we found.