Changing flights after getting a Schengen visa and staying longer

I requested an 11-day Schengen visa. But my duration of stay says 16 days on the visa. Does that means I'm free to stay 16 days?
And about the flight. I'm thinking of going to Russia first as I also have a visa for Russia. So would it be possible for me to fly from Russia to Schengen instead from my home country? Because when I applied for my visa I gave them a flight itinerary of a return ticket to my home country. My entry date, exit date and the itinerary will be the same in the Schengen zone. And I might stay longer than 11 days if it's possible.
Best Answer
We have many sad reports at this site from people who stayed longer on their visa than the original itinerary used to obtain it, whose subsequent applications were denied. However, these generally involved much, much longer deviations than five days, that suggested either the purpose of the visit (tourism) or the economic circumstances (how did you live for months without working off the books?) were not stated correctly in the application. I would not recommend staying until the last possible day, especially since a flight cancellation will make many more problems for you. Others may differ, and will downvote, but I think one or two days would be OK, if you feel you need them.
If you enter and exit at the places mentioned in your application, no one will care if you are coming direct from your Home Country or via a third country. It is understood this would sometimes be the case for cheaper flights even without additional holiday at a stopover.
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Can I change my flight after getting Schengen visa?
You cannot change your itinerary so completely that the information you gave in the visa application is no longer true. If you planned a trip lasting 10 days, and you now have 15 days "duration of stay", you can extend your trip by up to 5 days (including a visit to another country if you want).What happens if you stay longer than your Schengen visa?
Overstaying the Schengen Visa allowance of 90 days within 180 days is not without consequences. Remaining after the expiry period may constitute a stay without a corresponding residence permit and will be prosecuted in Germany as a criminal or administrative offence.What happens if you stay in Europe longer than 3 months?
The Schengen law states that you can't stay in the Area for more than 90 days. If you do, you're subject to a fine and possibly deportation and being banned from re-entering the Schengen Area.How can I stay in Schengen Area longer than 90 days?
Ways To Stay In Europe For More Than 90 DaysOverstaying in the Schengen Zone - How to Extend Your Stay in Europe UPDATED
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