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It is perfectly alright. All you need is a confirmed ticket out of the country. It doesnβt have to go back to the origin.
Onward in this case is as good as Return. I have done this a number of times, and have never had a problem.
Think about this: If an eVisa disallowed a transit visit to the country, Turkish airlines would have lost a ton of its customers who avail free transit stopovers in Istanbul thanks to eVisa.