Most airlines will not allow you on a flight unless you show you have the visa, but you can get a visa on arrival. However, sanctions have been lifted, most notably in 2016, with up to 900 Visas daily on average granted on arrival, according to the Office of Foreign Affairs. Tourism numbers annually have increased year-on-year, with 5.2 million foreign visitors entering Iran in 2015, in comparison to 4.7 million in 2013.