The sanctions were imposed on Pyongyang by the UN after it conducted a series of nuclear tests in 2006 and 2009.
They ban all trade in nuclear and missile technology with North Korea.
They also imposed an arms embargo and subjected some North Korean individuals to travel bans and assets freezes.
North Korea has twice tested nuclear devices and said in September last year that it had entered the final phase of uranium enrichment.
The country is believed to have enough plutonium to make about six bombs, but is not thought to have developed a ballistic missile capable of carrying a nuclear warhead.
The report was written by a UN panel of experts monitoring Pyongyang's compliance with the sanctions.
It said that "prohibited ballistic missile-related items are suspected to have been transferred between the Democratic People's Republic of Korea [North Korea] and the Islamic Republic of Iran", using regular scheduled flights on national carriers Air Koryo and Iran Air.