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

Return flights

06 Oct - 06 Nov	Frontier Airlines
02 Oct - 11 Oct	Icelandair
05 Oct - 14 Oct	Frontier Airlines
08 Oct - 01 Nov	Icelandair
29 Oct - 07 Nov	Icelandair
05 Oct - 21 Oct	Frontier Airlines
25 Oct - 31 Oct	Icelandair
05 Oct - 22 Oct	TAP
05 Oct - 13 Oct	Frontier Airlines
31 Oct - 07 Nov	Icelandair
07 Oct - 21 Oct	Frontier Airlines
08 Oct - 15 Oct	Icelandair
07 Oct - 01 Nov	Frontier Airlines
07 Oct - 20 Oct	Frontier Airlines
06 Oct - 21 Oct	Frontier Airlines
06 Oct - 01 Nov	Frontier Airlines
23 Oct - 04 Nov	TAP
26 Oct - 16 Nov	Allegiant Air
31 Oct - 22 Nov	TAP
31 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 521€

Return flights