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You can cancel with Turkish Airlines by following the steps below.

Open the homepage - turkishairlines.com and click "Manage Booking"

You have to enter the ticket number or reservation code and the last name. Click "Continue"

Select the reservation you need to cancel and choose the option "Cancel Flight."

You will get an email at your registered email account.

Alternatively, you can call the Turkish Airlines Phone Number 1 (800) 874-8875 or +1(802) 209-2600 to cancel your flight ticket. Once you dial the number, you have to follow the automated Voice instructions to get to an agent to cancel your flight. You have to give the flight booking details to the agent.

website: https://www.flieves.com/blogs/does-turkish-airlines-have-a-free-cancellation-policy