Separate long-haul flights, regional transport, lodging, food, local transit, activities, visas, and insurance, the same categories used in Japan’s trip cost breakdown. Daily food and transport can be modest in some destinations, while internal flights, ferries, private transfers, and premium-city lodging may dominate the total.
Build low and high cases around the route rather than applying one regional average, the same corridor-first approach outlined in the Asia travel guides overview. Add a contingency for weather disruption, baggage, and exchange-rate movement.
