The side are due to play West Ham on Sunday, but Sarri's preparation was disrupted as the flight was cancelled.
The players and staff stayed for an extra night at the Hyatt Regency Hotel in Thessaloniki after beating PAOK 1-0 on Thursday in the Europa League.
The delay means that Chelsea are due to arrive in London on Friday afternoon, just 48 hours before playing West Ham.
Alvaro Morata started the Europa League match, but he is set to be dropped for Olivier Giroud on Sunday after missing several good chances against the Greek side.
20 September 2018