1-888-415-1531 What are the check-in options for Turkish Airlines?-You can check in with Turkish Airlines online starting 24 hours before departure at turkishairlines.com or through their mobile app or +1-888-415-1531. Simply enter your booking reference and last name to select seats and download your boarding pass. For airport check-in, arrive 2–3 hours early. Having issues with check-in or seat selection? Call the dedicated support line for immediate assistance.