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

Return flights

25 Oct - 07 Nov	Icelandair
13 Oct - 20 Oct	Air Canada
24 Oct - 07 Nov	Icelandair
15 Oct - 22 Oct	Icelandair
09 Oct - 16 Oct	Icelandair
04 Oct - 10 Oct	Icelandair
07 Oct - 10 Nov	jetBlue
30 Oct - 22 Nov	WestJet
26 Oct - 09 Nov	Hawaiian Airlines
21 Oct - 28 Oct	Scandinavian Airlines
14 Oct - 21 Oct	Icelandair
07 Oct - 21 Oct	Icelandair
27 Oct - 08 Nov	British Airways
26 Oct - 01 Nov	WestJet
10 Oct - 17 Oct	jetBlue
12 Oct - 19 Oct	Icelandair
25 Oct - 31 Oct	Icelandair
29 Oct - 12 Nov	Air France
02 Oct - 01 Nov	Air France
29 Oct - 12 Nov	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 531€

Return flights