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

Return flights

03 Oct - 07 Oct	Icelandair
18 Oct - 03 Nov	Icelandair
25 Oct - 21 Nov	Icelandair
08 Oct - 01 Nov	Icelandair
06 Oct - 06 Nov	Frontier Airlines
30 Oct - 05 Nov	TAP
14 Oct - 20 Oct	TAP
14 Oct - 21 Oct	TAP
02 Oct - 11 Oct	Icelandair
05 Oct - 14 Oct	Frontier Airlines
08 Oct - 15 Oct	Icelandair
17 Oct - 21 Oct	SWISS
07 Oct - 21 Oct	Icelandair
05 Oct - 13 Oct	Frontier Airlines
04 Oct - 11 Oct	Icelandair
31 Oct - 07 Nov	Icelandair
27 Oct - 02 Nov	TAP
30 Oct - 22 Nov	TAP
07 Oct - 01 Nov	Frontier Airlines
26 Oct - 16 Nov	TAP

Also check the deals for one-way flights from Washington 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 Washington to Istanbul in October from $581

Return flights