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

Return flights

07 May - 11 May	Delta
13 May - 24 May	KLM
28 May - 11 Jun	KLM
25 May - 08 Jun	Air France
15 May - 09 Jun	Icelandair
07 May - 11 May	Turkish Airlines	direct
15 May - 09 Jun	Turkish Airlines	direct
13 May - 24 May	Turkish Airlines	direct
25 May - 08 Jun	Turkish Airlines	direct

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

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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Cheapest return flights from Seattle to Istanbul in May from 529€

Return flights