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

Return flights

29 Dec - 12 Jan	Air France
11 Dec - 19 Dec	Air France
14 Dec - 20 Dec	Air France
29 Dec - 12 Jan	Turkish Airlines	direct
26 Dec - 09 Jan	Lufthansa
11 Dec - 19 Dec	Turkish Airlines	direct
23 Dec - 04 Jan	Spirit Airlines
20 Dec - 26 Dec	Air France
26 Dec - 09 Jan	Turkish Airlines	direct
19 Dec - 09 Jan	Spirit Airlines
14 Dec - 20 Dec	Turkish Airlines	direct
19 Dec - 05 Jan	British Airways
19 Dec - 01 Jan	Spirit Airlines
20 Dec - 26 Dec	Turkish Airlines	direct
23 Dec - 04 Jan	Turkish Airlines	direct
19 Dec - 01 Jan	Turkish Airlines	direct

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 642€

Return flights