Cheapest return flights from Seattle to Istanbul in September from $572

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

Return flights

13 Sep - 20 Sep Scandinavian Airlines
12 Sep - 18 Sep Scandinavian Airlines
29 Sep - 09 Oct Scandinavian Airlines
20 Sep - 27 Sep Scandinavian Airlines
08 Sep - 22 Sep Scandinavian Airlines
15 Sep - 23 Sep Icelandair
28 Sep - 09 Oct Air France
02 Sep - 09 Sep Icelandair
15 Sep - 23 Sep Turkish Airlines direct
02 Sep - 09 Sep Turkish Airlines direct
29 Sep - 09 Oct Turkish Airlines direct
28 Sep - 09 Oct Turkish Airlines direct
08 Sep - 22 Sep Turkish Airlines direct
12 Sep - 18 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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