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

Return flights

09 Dec - 15 Dec	Lufthansa
04 Dec - 16 Dec	Delta
09 Dec - 16 Dec	Delta
04 Dec - 09 Dec	Lufthansa
03 Dec - 18 Dec	KLM
28 Dec - 17 Jan	Air France
29 Dec - 24 Jan	Air France
06 Dec - 10 Jan	Spirit Airlines
11 Dec - 18 Dec	Air France
10 Dec - 10 Jan	Spirit Airlines
09 Dec - 09 Jan	Frontier Airlines
03 Dec - 17 Dec	Delta
09 Dec - 27 Dec	KLM
11 Dec - 15 Dec	Lufthansa
15 Dec - 10 Jan	Spirit Airlines
25 Dec - 17 Jan	Air France
06 Dec - 20 Dec	Spirit Airlines
16 Dec - 10 Jan	Spirit Airlines
24 Dec - 20 Jan	Delta
17 Dec - 10 Jan	Spirit Airlines

Also check the deals for one-way flights from Houston 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 Houston to Istanbul in December from 491€

Return flights