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

Return flights

03 Dec - 08 Dec	Icelandair
05 Dec - 12 Dec	Icelandair
15 Dec - 29 Dec	Air France
15 Dec - 16 Jan	Air France
01 Dec - 10 Dec	Lufthansa
04 Dec - 27 Dec	Air France
04 Dec - 13 Dec	Icelandair
24 Dec - 05 Jan	Icelandair
27 Dec - 17 Jan	Lufthansa
03 Dec - 08 Dec	Turkish Airlines	direct
01 Dec - 27 Dec	Turkish Airlines	direct
24 Dec - 31 Dec	British Airways
04 Dec - 27 Dec	Turkish Airlines	direct
22 Dec - 17 Jan	KLM
16 Dec - 12 Jan	Aer Lingus
26 Dec - 17 Jan	Lufthansa
23 Dec - 13 Jan	KLM
27 Dec - 17 Jan	Turkish Airlines	direct
23 Dec - 05 Jan	Icelandair
26 Dec - 17 Jan	Turkish Airlines	direct

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 $613

Return flights