Cheapest one-way flights from Seattle to Istanbul in December from 445€

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

One-Way flights

10 Dec Icelandair
11 Dec Condor
21 Dec Frontier Airlines
11 Dec Turkish Airlines direct
20 Dec Frontier Airlines
19 Dec Alaska Airlines
10 Dec Turkish Airlines direct
21 Dec Turkish Airlines direct
19 Dec Turkish Airlines direct
20 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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