Cheapest return flights from Seattle to Istanbul in May from $654

AirHint found the following cheapest return flights from Seattle (SEA) to Istanbul (IST) in May 2026 (see full year).

Return flights

10 May - 23 May Scandinavian Airlines
10 May - 22 May Scandinavian Airlines
03 May - 15 May KLM
18 May - 01 Jun KLM
22 May - 28 May KLM
15 May - 29 May Aer Lingus
15 May - 30 May Scandinavian Airlines
22 May - 28 May Turkish Airlines direct
03 May - 15 May Turkish Airlines direct
10 May - 22 May Turkish Airlines direct
15 May - 29 May Turkish Airlines direct
18 May - 01 Jun Turkish Airlines direct

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

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