Cheapest return flights from Portland to Istanbul in December from 350€

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

Return flights

06 Dec - 15 Dec Icelandair
01 Dec - 04 Dec KLM
07 Dec - 27 Dec KLM
03 Dec - 27 Dec KLM
07 Dec - 12 Dec Alaska Airlines
15 Dec - 10 Jan Hawaiian Airlines
12 Dec - 08 Jan Frontier Airlines
16 Dec - 22 Dec Icelandair
14 Dec - 18 Dec Hawaiian Airlines
09 Dec - 03 Jan Icelandair
08 Dec - 03 Jan Icelandair
14 Dec - 03 Jan Hawaiian Airlines
24 Dec - 01 Jan KLM
26 Dec - 04 Jan Hawaiian Airlines

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

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