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

Return flights

21 Oct - 28 Oct	Scandinavian Airlines
04 Oct - 10 Oct	Icelandair
25 Oct - 07 Nov	Icelandair
01 Oct - 10 Oct	Icelandair
03 Oct - 20 Oct	WestJet
30 Oct - 22 Nov	KLM
31 Oct - 22 Nov	KLM
30 Oct - 13 Nov	KLM
02 Oct - 05 Nov	Alaska Airlines
25 Oct - 31 Oct	Icelandair
15 Oct - 29 Oct	Scandinavian Airlines
14 Oct - 30 Oct	KLM
27 Oct - 10 Nov	KLM
25 Oct - 02 Nov	KLM
02 Oct - 15 Oct	Icelandair
08 Oct - 01 Nov	WestJet
07 Oct - 01 Nov	Hawaiian Airlines
22 Oct - 15 Nov	Icelandair
23 Oct - 27 Oct	WestJet
03 Oct - 25 Oct	WestJet

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 617€

Return flights