Launch from Baikonur; landing 200 km southeast of Karaganda.

Rendezvous-flight with Vostok 4. Both spacecrafts came close to 5 km (visibility), although the Vostok-capsules had no maneuvering capability. They quickly drifted apart. Vostok 3 also conducted several scientific observations and further improvement of the space ship systems, communications (spaceship ground control and spaceship-to spaceship), guidance and landing. There were no problems with his spacesuit, there was only a minor problem with the Tral telemetry system.

A final "first" for Vostok 3 was Nikolayev's taking of colour movie footage of the Earth from orbit and from the cabin interior.

The re-entry was the same procedure as in the other Vostok missions.