Athens, Greece
Total cost per day: $76.38
You can score round-trip airfare to the capital of Greece for only $510 on average, which is one of the cheapest international flights on GOBankingRates’ list. Some notable landmarks in Athens include ancient ruins of the Acropolis and the Parthenon — perfect for history junkies. Hotels will cost you an average of $36 per night, and you can expect to pay a little over $11 for a meal at an inexpensive restaurant.