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

Return flights

05 Dec - 12 Dec	Icelandair
03 Dec - 08 Dec	Icelandair
15 Dec - 29 Dec	Air France
15 Dec - 16 Jan	Air France
04 Dec - 27 Dec	Air France
27 Dec - 17 Jan	Lufthansa
22 Dec - 17 Jan	KLM
16 Dec - 12 Jan	Aer Lingus
24 Dec - 05 Jan	Icelandair
03 Dec - 08 Dec	Turkish Airlines	direct
22 Dec - 28 Dec	Air France
22 Dec - 27 Dec	Air France
23 Dec - 13 Jan	KLM
26 Dec - 17 Jan	British Airways
17 Dec - 21 Dec	Icelandair
17 Dec - 23 Dec	Icelandair
04 Dec - 27 Dec	Turkish Airlines	direct
27 Dec - 17 Jan	Turkish Airlines	direct
20 Dec - 13 Jan	British Airways
20 Dec - 06 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 542€

Return flights