According to TASS with reference to data from the US National Aeronautics and Space Administration (NASA), the docking of the spacecraft with the station took place offline at 03:28 Moscow time on May 21.

Starliner took off from Cape Canaveral, Florida at 01:54 Moscow time.

Initially, the docking was supposed to take place at 02:10 Moscow time, but the procedure had to be postponed due to a number of technical problems.