Cheapest return flights from Seattle to Istanbul in December from 650€

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

Return flights

22 Dec - 28 Dec KLM
25 Dec - 08 Jan KLM
16 Dec - 06 Jan KLM
22 Dec - 05 Jan KLM
06 Dec - 01 Jan Air France
29 Dec - 04 Jan KLM
06 Dec - 01 Jan Turkish Airlines direct
29 Dec - 04 Jan Turkish Airlines direct
25 Dec - 08 Jan Turkish Airlines direct
22 Dec - 28 Dec Turkish Airlines direct
16 Dec - 06 Jan Turkish Airlines direct
22 Dec - 05 Jan Turkish Airlines direct

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

Skyscanner

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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