Cheapest return flights from Seattle to Istanbul in September from 778€

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

28 Sep - 04 Oct Icelandair
24 Sep - 29 Sep Icelandair
21 Sep - 26 Sep Icelandair
15 Sep - 20 Sep Icelandair
05 Sep - 20 Sep Icelandair
28 Sep - 05 Oct Icelandair
18 Sep - 23 Sep Icelandair
30 Sep - 05 Oct British Airways
03 Sep - 08 Sep Icelandair
12 Sep - 17 Sep Alaska Airlines
27 Sep - 02 Oct Turkish Airlines direct
12 Sep - 17 Sep Turkish Airlines direct
24 Sep - 29 Sep Turkish Airlines direct
18 Sep - 23 Sep Turkish Airlines direct
28 Sep - 05 Oct Turkish Airlines direct
30 Sep - 05 Oct Turkish Airlines direct
28 Sep - 04 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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