When buying tickets, it is important to take into account the flight time and the time difference between the departure point and Kamchatka.
For example, if your program starts on April 1, it means that you need to be in Petropavlovsk-Kamchatsky on April 1. In this case, fly out of Moscow, Novosibirsk, Irkutsk need March 31.
You can fly from Vladivostok, Khabarovsk, Sakhalin and Blagoveshchensk on the same date, if there is a suitable flight. You can arrive at any time on the day or night of the date that is indicated as the beginning of the program or earlier.
You cannot arrive the next day, regardless of what is indicated in your program — due to the weather, changes may be made to the order of the program, and then you can skip the departure, for which no refund is provided in such conditions.
The last day of the program is the day of departure. You can leave at any time on this day or later.
You arrive in Moscow on the same day and hour at which you took off.
With most cities in Russia, everything happens about the same way, maybe an hour late.