AirHint found the following cheapest return flights from Houston (IAH) to Istanbul (IST) in September 2026 (see full year).
Return flights
| 23 Sep - 07 Oct | KLM | ||
| 20 Sep - 04 Oct | KLM | ||
| 23 Sep - 07 Oct | Turkish Airlines | direct | |
| 20 Sep - 04 Oct | Turkish Airlines | direct |
Also check the deals for one-way flights from Houston to Istanbul in September.
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