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

Return flights

08 Oct - 15 Oct	Icelandair
12 Oct - 18 Oct	Icelandair
01 Oct - 15 Oct	Icelandair
04 Oct - 18 Oct	Icelandair
31 Oct - 14 Nov	Air France
01 Oct - 01 Nov	KLM
28 Oct - 14 Nov	Delta
01 Oct - 15 Oct	Turkish Airlines	direct
08 Oct - 15 Oct	Turkish Airlines	direct
04 Oct - 18 Oct	Turkish Airlines	direct
12 Oct - 18 Oct	Turkish Airlines	direct

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

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 October from 490€

Return flights