The UAE said on Monday it will send either Hazza al-Mansoori or Sultan al-Neyadi to the International Space Station on September 25 aboard a Russian Soyuz rocket.
Organisers had earlier said they would announce the astronaut who was going but instead gave just the launch date.
Dubai’s ruler Sheikh Mohammed bin Rashid Al-Maktoum had already announced the astronauts’ names last September.
The UAE has a fledgling space program with big ambitions. It launched its first locally made satellite KhalifaSat from Japan in October. It wants to launch a probe to Mars in 2020.
The UAE also says it wants to colonise Mars by 2117, with a fully functioning city of 600,000.