Cheapest return flights from Seattle to Istanbul in September from $539

AirHint found the following cheapest return flights from Seattle (SEA) to Istanbul (IST) in September 2026 (see full year).

Return flights

18 Sep - 29 Sep Icelandair
18 Sep - 27 Sep Scandinavian Airlines
18 Sep - 02 Oct Scandinavian Airlines
18 Sep - 30 Sep Scandinavian Airlines
08 Sep - 19 Sep Scandinavian Airlines
18 Sep - 28 Sep Scandinavian Airlines
22 Sep - 13 Oct Scandinavian Airlines
22 Sep - 13 Oct Turkish Airlines direct
18 Sep - 30 Sep Turkish Airlines direct
18 Sep - 02 Oct Turkish Airlines direct
08 Sep - 19 Sep Turkish Airlines direct
18 Sep - 29 Sep Turkish Airlines direct
18 Sep - 28 Sep Turkish Airlines direct
18 Sep - 27 Sep 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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