Iran's state TV says Iran and Britain have signed an agreement to establish a total of 42 weekly passenger flights between the two countries.
Thursday's report says the Iranian and the British civil aviation authorities will allow each country to maintain 21 weekly flights to various destinations in the other nation. It also says there will be unlimited cargo flights.
British Airways plans to resume its scheduled flights to Iran in July. The carrier halted flights to Tehran in 2012 amid rifts between Iran and the West over Tehran's nuclear ambitions. Iran Air, however, continued its three weekly flights to London.
Last December, Air France also said it would resume flights to Tehran for the first time in more than seven years, starting in April.
In its travel advice, the Foreign Office warns people against all travel to within 100km of the Iran/Afghanistan border or within 10 km of the Iran/Iraq border.