Cheapest Istanbul to Kastamonu round trip flight dates on THY
THY · Istanbul ↔ Kastamonu · Round trip
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See our recommended car rental companies ↗Kastamonu travel guide
Kastamonu combines historic city views with a slower pace. The castle is a worthwhile focus for scenery lovers, while nature trips beyond the centre need separate planning.
🏰 Allow time for the view from the castle and account for the steps on the way up.
🚶 Break up your central walk with pauses and wear comfortable shoes for the climb.
🌲 If you want to head towards Ilgaz, treat it as a separate nature excursion.
About Istanbul → Kastamonu round trip flights
Use this page to find the cheapest flight dates for round trip flights from Istanbul to Kastamonu.
Active filters: Airline: THY.
Price summary
The price calendar covers 1 month for round trip flights from Istanbul to Kastamonu.
Lowest months: December 2026 (TRY 3,392).
Monthly lowest prices: December 2026: TRY 3,392.
In December 2026, the lowest date starts from TRY 3,392.
Daily prices are listed for 1 dates.