Cheapest return flights from Seattle to Istanbul in September from 561€

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

Return flights

14 Sep - 23 Sep Icelandair
27 Sep - 07 Oct Icelandair
11 Sep - 18 Sep Air Canada
20 Sep - 11 Oct Frontier Airlines
21 Sep - 11 Oct Frontier Airlines
18 Sep - 02 Oct Frontier Airlines
18 Sep - 11 Oct Frontier Airlines
09 Sep - 20 Sep Alaska Airlines
29 Sep - 03 Oct KLM
28 Sep - 12 Oct KLM
17 Sep - 11 Oct Alaska Airlines
12 Sep - 19 Sep Alaska Airlines
15 Sep - 20 Sep WestJet
19 Sep - 11 Oct Frontier Airlines
19 Sep - 23 Sep Frontier Airlines
08 Sep - 11 Sep KLM
12 Sep - 04 Oct Alaska Airlines
18 Sep - 28 Sep Emirates
16 Sep - 26 Sep Aer Lingus

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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