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

Return flights

06 Dec - 12 Dec	KLM
06 Dec - 13 Dec	KLM
09 Dec - 16 Dec	KLM
12 Dec - 25 Dec	jetBlue
01 Dec - 05 Dec	KLM
01 Dec - 12 Dec	KLM
10 Dec - 19 Dec	British Airways
29 Dec - 12 Jan	British Airways
15 Dec - 25 Dec	jetBlue
11 Dec - 19 Dec	British Airways
11 Dec - 18 Dec	British Airways
24 Dec - 12 Jan	jetBlue
13 Dec - 08 Jan	jetBlue
28 Dec - 17 Jan	British Airways
16 Dec - 08 Jan	jetBlue
24 Dec - 07 Jan	British Airways
14 Dec - 08 Jan	jetBlue
24 Dec - 06 Jan	jetBlue
17 Dec - 15 Jan	KLM
14 Dec - 16 Jan	British Airways

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 633€

Return flights