Cheapest return flights from Seattle to Istanbul in April from $571

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

Return flights

20 Apr - 04 May Icelandair
15 Apr - 06 May Icelandair
28 Apr - 05 May KLM
13 Apr - 19 Apr Air France
06 Apr - 27 Apr Air France
22 Apr - 06 May KLM
01 Apr - 10 Apr KLM
30 Apr - 09 May KLM
09 Apr - 17 Apr KLM
25 Apr - 29 Apr Icelandair
28 Apr - 05 May Turkish Airlines direct
22 Apr - 06 May Turkish Airlines direct
15 Apr - 06 May Turkish Airlines direct
25 Apr - 29 Apr Turkish Airlines direct
20 Apr - 04 May Turkish Airlines direct
19 Apr - 03 May KLM
04 Apr - 12 Apr Air France
14 Apr - 19 Apr KLM
11 Apr - 24 Apr KLM
14 Apr - 19 Apr Turkish Airlines direct

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

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