Cheapest return IAH–IST flights, May

AirHint found the following cheapest return flights from Houston (IAH) to Istanbul (IST) in May 2026 (see full year).

Return flights

09 May - 19 May Frontier Airlines
16 May - 26 May Frontier Airlines
13 May - 22 May KLM
14 May - 19 May Spirit Airlines
13 May - 24 May KLM
14 May - 16 May KLM
25 May - 30 May Air France
14 May - 23 May Spirit Airlines
21 May - 24 May KLM
25 May - 28 May Spirit Airlines
25 May - 08 Jun KLM
29 May - 25 Jun Frontier Airlines
28 May - 06 Jun Spirit Airlines
21 May - 04 Jun Spirit Airlines
31 May - 14 Jun Frontier Airlines
04 May - 14 Jun Lufthansa
04 May - 14 Jun Turkish Airlines direct
25 May - 08 Jun Turkish Airlines direct
31 May - 14 Jun Turkish Airlines direct
28 May - 06 Jun Turkish Airlines direct

Also check the deals for one-way flights from Houston to Istanbul in May.

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