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

Return flights

03 Dec - 15 Dec	Icelandair
10 Dec - 21 Jan	Lufthansa
03 Dec - 11 Dec	Lufthansa
07 Dec - 14 Dec	Lufthansa
30 Dec - 14 Jan	Lufthansa
05 Dec - 12 Dec	Lufthansa
06 Dec - 14 Jan	Lufthansa
04 Dec - 11 Dec	Lufthansa
31 Dec - 24 Jan	Lufthansa
11 Dec - 25 Dec	Delta
11 Dec - 24 Dec	Delta
04 Dec - 08 Dec	Lufthansa
11 Dec - 18 Dec	Delta
10 Dec - 20 Jan	KLM
11 Dec - 20 Jan	Air France
04 Dec - 08 Dec	Turkish Airlines	direct
06 Dec - 14 Jan	Turkish Airlines	direct
24 Dec - 17 Jan	Air France
10 Dec - 20 Jan	Turkish Airlines	direct
10 Dec - 21 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 343€

Return flights