Can I go Schengen to Schengen via non-Schengen airport with a single-entry Schengen visa?

I have a single-entry Schengen visa on my Indian passport. The visa is for visiting Finland. I have bought round trip tickets to Venice from Helsinki within the validity period of my Schengen visa. However, the flights are operated by Turkish Airlines and while going to Venice and returning from Venice to Helsinki, I have a stop-over at Istanbul.
Am I allowed to re-enter Helsinki on my single-entry Schengen visa?
Best Answer
When you leave Finland on a flight to Istanbul you will get the stamp that you have left the Schengen area.
When you next arrive into the Schengen area, in Venice, you will be told you can not enter the area as you have used the one visit allowed.
More likely is that you are not allowed to enter the plane in Istanbul, as you will not have a valid visa for your arrival country.
Best re-book your flight to one that is direct, as you will not be allowed back into the Schengen Zone. Direct flight will be acceptable as would be surface travel as long as you stay within the Schengen zone (but that is a very long travel for this combination of countries.)
Or just forget the side step to Venice as it will likely not be worth to lose your visa for Finland over.
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Can you travel to other Schengen countries with single entry visa?
The single entry visa will allow you to travel to the 'Schengen area' and visit any of the countries within it. However, you can only enter the 'Schengen area' once with this visa.Can I travel to more than one Schengen country with the same Schengen Visa?
Yes. According to the Schengen rules, the Schengen visa is generally valid for all the countries in the Schengen area.What does Schengen Visa single entry mean?
Schengen visas may allow for a single-entry or multiple entries. With a single-entry visa you can enter the Schengen area only once. This is indicated on the visa sticker by "01". With a visa allowing for two or multiple entries you may enter twice or several times during the validity of the visa.Do I need a Schengen Visa to transit through Europe?
The Transit Schengen Visa is a document that has been established by the Schengen Area Member States with the sole purpose of facilitating traveling for non-EU/EEA nationals who have to land at an airport located in the Schengen Area, in order to take a flight to their non-Schengen destination country.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
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