Launch from the Baikonur Cosmodrome; landing 56 km east of Arkalyk.

The crew was originally for backup crew for Soyuz 18A crew, but that launch failed. Following a one day solo flight the Soyuz docked with Salyut 4 on 25.05.1975. The cosmonauts became the 2nd crew of spacestation Salyut 4. They stayed 62 days onboard. For that reason the focus of the mission research into long-term stays in space, with the crew performing various biomedical experiments (includig intensive physically exercise) and growing plants in orbit. They also made solar observations and took photos of the Earths surface.

The crew remained aloft aboard the station during the ASTP joint flight.