I'd be very surprised if this is a legal connection at IST. I'd put odds of making it at <10%. Also, TK won't sell it as a valid connection so roughly zero chance of getting it ticketed as a single trip. Fly down to IST the night before if you really want the IST-ORD flight.
Originally Posted by
mahasamatman
Is it more important to you to get back on time, or just to get back? If this is all on one ticket, and you meet the airline's official minimum connect time, it's up to them to get you to your destination if there's a delay.
Sure, but that could still be days later depending on what availability looks like. And TK is not known to be particularly functional when it comes to IROPS or other travel interruptions.