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

Return flights

23 Aug - 05 Sep	Icelandair
12 Aug - 26 Aug	Icelandair
22 Aug - 31 Aug	Icelandair
23 Aug - 29 Aug	Icelandair
25 Aug - 29 Aug	Icelandair
21 Aug - 04 Sep	Icelandair
21 Aug - 05 Sep	Icelandair
05 Aug - 20 Aug	British Airways
21 Aug - 28 Aug	Icelandair
25 Aug - 08 Sep	Icelandair
24 Aug - 20 Sep	Icelandair
08 Aug - 20 Aug	Icelandair
25 Aug - 29 Sep	Icelandair
17 Aug - 24 Aug	Icelandair
22 Aug - 05 Sep	Icelandair
07 Aug - 21 Aug	British Airways
21 Aug - 30 Aug	Icelandair
21 Aug - 06 Sep	Icelandair
07 Aug - 05 Sep	Icelandair
21 Aug - 04 Sep	Turkish Airlines	direct

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

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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Cheapest return flights from Seattle to Istanbul in August from 529€

Return flights