Budget ranges widely by season, cities, airline, and lodging:
Airfare: $500–1,500 per person
Accommodation: $50–300/night/room
Food & daily expenses: $50–100/person/day
Total per person: $2,000–6,000 for a typical 1–2 week trip. For four, multiply accordingly. Book early, travel shoulder season (Apr–May, Sep–Oct) for best value.