Cheapest one-way flights from Seattle to Istanbul in December from $339

AirHint found the following cheapest one-way flights from Seattle (SEA) to Istanbul (IST) in December 2025 (see full year).

One-Way flights

29 Dec WestJet
06 Dec Hawaiian Airlines
11 Dec WestJet
25 Dec WestJet
24 Dec Frontier Airlines
16 Dec Icelandair
29 Dec Turkish Airlines direct
11 Dec Turkish Airlines direct
06 Dec Turkish Airlines direct
25 Dec Turkish Airlines direct

Also check the deals for return flights from Seattle to Istanbul in December.

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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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