Cheapest return flights from Seattle to Istanbul in September from $769

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

Return flights

29 Sep - 03 Oct Icelandair
09 Sep - 23 Sep Icelandair
30 Sep - 13 Oct Hawaiian Airlines
27 Sep - 11 Oct Hawaiian Airlines
11 Sep - 23 Sep Icelandair
26 Sep - 18 Oct Hawaiian Airlines
07 Sep - 27 Sep Icelandair
28 Sep - 18 Oct KLM
16 Sep - 26 Sep Icelandair
19 Sep - 27 Sep Frontier Airlines
30 Sep - 25 Oct Hawaiian Airlines
23 Sep - 28 Sep Air Canada
16 Sep - 03 Oct WestJet
19 Sep - 22 Sep Hawaiian Airlines
16 Sep - 13 Oct Icelandair
11 Sep - 18 Sep Icelandair
11 Sep - 04 Oct Qatar Airways
11 Sep - 14 Sep Alaska Airlines
13 Sep - 04 Oct WestJet
09 Sep - 23 Sep Turkish Airlines direct

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

Skyscanner

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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