AirHint found the following cheapest return flights from Split (SPU) to Istanbul (IST) in December 2025 (see full year).

Return flights

23 Dec - 30 Dec	Croatia Airlines	direct
30 Dec - 04 Jan	Croatia Airlines	direct
28 Dec - 04 Jan	Croatia Airlines	direct
23 Dec - 01 Jan	Croatia Airlines	direct
21 Dec - 23 Dec	Croatia Airlines	direct
04 Dec - 07 Dec	Eurowings
25 Dec - 04 Jan	Croatia Airlines

Also check the deals for one-way flights from Split to Istanbul in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Split to Istanbul in December from 154€

Return flights