Cheapest return flights from Denver to Istanbul in December from 465€

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

Return flights

02 Dec - 08 Dec Icelandair
01 Dec - 08 Dec Icelandair
03 Dec - 15 Dec Hawaiian Airlines
04 Dec - 11 Dec Icelandair
08 Dec - 13 Jan Frontier Airlines
06 Dec - 13 Jan Frontier Airlines
09 Dec - 13 Jan Frontier Airlines
06 Dec - 12 Dec Frontier Airlines
30 Dec - 31 Jan Frontier Airlines
04 Dec - 08 Jan Frontier Airlines
13 Dec - 13 Jan Frontier Airlines
30 Dec - 24 Jan Frontier Airlines
06 Dec - 06 Jan Frontier Airlines
30 Dec - 31 Jan Turkish Airlines direct
31 Dec - 14 Jan Lufthansa
06 Dec - 13 Dec Frontier Airlines
04 Dec - 11 Dec Turkish Airlines direct
04 Dec - 16 Dec Turkish Airlines direct
09 Dec - 23 Dec Frontier Airlines
12 Dec - 16 Dec Turkish Airlines direct

Also check the deals for one-way flights from Denver to Istanbul in December.

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