Cheapest return flights from Seattle to Istanbul in September from $877

Best time to book flights for Seattle (SEA) to Istanbul (IST) flights at AirHint

AirHint found the following cheapest return flights from Seattle (SEA) to Istanbul (IST) in September 2025 (see full year).

Return flights

30 Sep - 14 Oct Icelandair
20 Sep - 06 Oct Icelandair
25 Sep - 23 Oct Icelandair
15 Sep - 21 Sep Icelandair
27 Sep - 11 Oct Icelandair
27 Sep - 25 Oct Icelandair
25 Sep - 23 Oct Turkish Airlines direct
30 Sep - 14 Oct Turkish Airlines direct
27 Sep - 11 Oct Turkish Airlines direct
27 Sep - 25 Oct Turkish Airlines direct
15 Sep - 21 Sep Turkish Airlines direct
20 Sep - 06 Oct Turkish Airlines direct

Also check the deals for one-way flights from Seattle to Istanbul in September.

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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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