In 2026, the cheapest time to fly to Tokyo is generally during the "off-season" months of January, February, and early March, as well as the "shoulder" periods in late September and October. During these windows, you can often find round-trip fares for 30% to 50% less than the peak spring (Cherry Blossom) or summer periods. The cold but dry winter weather deters the mass crowds, leading airlines and hotels to drop prices significantly to maintain occupancy. Another "hidden" cheap window is in early June, which coincides with Japan’s rainy season (tsuyu); while you may deal with overcast skies, the savings can be substantial. To get the best deal, it is highly recommended to avoid "Golden Week" in late April/early May and the New Year holiday, when domestic and international travel spikes. For a budget-conscious traveler, mid-week flights in January offer the absolute lowest baseline prices, provided you are prepared for temperatures in the 40s (F) and are willing to trade the famous pink blossoms for crisp, sunny winter days.