As of November 12, 2026, the cheapest countries worth visiting in September are Bolivia ($36 a day), India ($53 a day), Kyrgyzstan ($58 a day), counting only places where September is peak or shoulder season and the US advisory is Level 2 or better. For lower prices still, India, Sri Lanka, Vietnam are in shoulder season that month.
Price is a modeled mid-range day per person in US dollars, excluding flights; the figure beneath it is the real 12-month change. Shoulder means workable weather and lower prices than peak. Countries at advisory Level 3 or 4 are left out.