In 2026, Turkish Airlines typically uses a dynamic baggage calculator for international routes, but there are established standards for excess fees. For flights using the "piece concept" (like those to the US or Canada), an extra bag up to 23 kg usually costs between $160 and $450 depending on the route and when you purchase it; buying via the app or website is significantly cheaper than at the airport. For routes using the "weight concept" (common in Europe, Asia, and Africa), excess weight is charged per kilogram, often ranging from $10 to $35 per kg. If a single bag exceeds the standard 23 kg limit but is under 32 kg, a fixed "heavy bag" fee of approximately $80 is often applied. It is a high-value strategy to use the "Baggage Calculator" on the Turkish Airlines website before your flight, as "PrimeFly" and "ExtraFly" fares have different included allowances that can significantly alter the final cost of adding more luggage to your journey.