Passengers seeking seat upgrade options on a flight with Turkish Airlines can offer a dedicated seat upgrade service. They can upgrade their seats with different methods, such as using miles, paying in cash during check-in, or placing a bid. Travelers can use the Turkish Airlines Seat Upgrade options through the official website. For further details on the upgrade at the airline, one can make a phone call to the expert in the customer service team or read the blog on the Airlines Group Travel website.