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

Return flights

01 Oct - 06 Oct	Air Canada
13 Oct - 23 Oct	Air Canada
22 Oct - 30 Oct	Air Canada
06 Oct - 13 Oct	Air Canada
31 Oct - 11 Nov	Air Canada
14 Oct - 03 Nov	Air Canada
21 Oct - 08 Nov	Air Canada
21 Oct - 01 Nov	Air Canada
24 Oct - 12 Nov	Air Canada
27 Oct - 09 Nov	Air Canada
12 Oct - 26 Oct	Air Canada
01 Oct - 12 Oct	Air Canada
16 Oct - 30 Oct	Delta
15 Oct - 29 Oct	Royal Jordanian
14 Oct - 21 Oct	British Airways

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 $645

Return flights