Cheapest return flights from Denver to Istanbul in December from $749

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

Return flights

30 Dec - 24 Jan Turkish Airlines direct
29 Dec - 24 Jan Frontier Airlines
03 Dec - 15 Dec Hawaiian Airlines
04 Dec - 27 Dec Turkish Airlines direct
26 Dec - 09 Jan Turkish Airlines direct
13 Dec - 23 Dec British Airways
27 Dec - 07 Jan British Airways
05 Dec - 27 Dec Frontier Airlines
13 Dec - 23 Dec Turkish Airlines direct
06 Dec - 20 Dec Frontier Airlines
16 Dec - 10 Jan Frontier Airlines
16 Dec - 30 Dec British Airways
06 Dec - 20 Dec Turkish Airlines direct
20 Dec - 10 Jan Frontier Airlines
29 Dec - 05 Jan Lufthansa
19 Dec - 17 Jan Frontier Airlines
19 Dec - 10 Jan Frontier Airlines
26 Dec - 06 Jan Turkish Airlines
16 Dec - 30 Dec Turkish Airlines direct
20 Dec - 30 Dec Turkish Airlines direct

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

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