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

Return flights

09 May - 15 May	Icelandair
10 May - 17 May	Lufthansa
09 May - 16 May	Icelandair
20 May - 03 Jun	Lufthansa
17 May - 31 May	Air France
13 May - 27 May	Delta
29 May - 14 Jun	KLM
21 May - 26 May	KLM
22 May - 06 Jun	Icelandair
21 May - 26 May	Turkish Airlines	direct
20 May - 03 Jun	Turkish Airlines	direct
17 May - 31 May	Turkish Airlines	direct
09 May - 15 May	Turkish Airlines	direct
10 May - 17 May	Turkish Airlines	direct
29 May - 14 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 593€

Return flights