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

Return flights

13 Dec - 25 Dec	jetBlue
24 Dec - 19 Jan	British Airways
09 Dec - 16 Dec	Delta
15 Dec - 15 Jan	KLM
28 Dec - 13 Jan	British Airways
28 Dec - 28 Jan	British Airways
05 Dec - 09 Dec	Delta
27 Dec - 13 Jan	British Airways
05 Dec - 08 Dec	Delta
13 Dec - 26 Dec	British Airways
13 Dec - 22 Dec	British Airways
24 Dec - 12 Jan	British Airways
25 Dec - 19 Jan	KLM
08 Dec - 27 Dec	British Airways
08 Dec - 06 Jan	Delta
14 Dec - 26 Dec	British Airways
13 Dec - 27 Dec	British Airways
16 Dec - 17 Jan	KLM
10 Dec - 01 Jan	Scandinavian Airlines
08 Dec - 31 Dec	Finnair

Also check the deals for one-way flights from Washington 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 Washington to Istanbul in December from 889€

Return flights