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

Return flights

07 Oct - 21 Oct	Frontier Airlines
07 Oct - 13 Oct	Frontier Airlines
25 Oct - 15 Nov	Frontier Airlines
01 Oct - 07 Oct	Frontier Airlines
09 Oct - 01 Nov	Frontier Airlines
23 Oct - 31 Oct	Frontier Airlines
17 Oct - 08 Nov	Frontier Airlines
24 Oct - 01 Nov	Frontier Airlines
02 Oct - 25 Oct	Frontier Airlines
09 Oct - 23 Oct	Air Canada
18 Oct - 23 Oct	Air Canada

Also check the deals for one-way flights from Denver 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 Denver to Istanbul in October from $707

Return flights