AirHint found the following cheapest return flights from Seattle (SEA) to Istanbul (IST) in April 2026 (see full year).
Return flights
| 07 Apr - 21 Apr | Lufthansa | ||
| 29 Apr - 07 May | Delta | ||
| 10 Apr - 24 Apr | Lufthansa | ||
| 07 Apr - 21 Apr | Turkish Airlines | direct | |
| 10 Apr - 24 Apr | Turkish Airlines | direct |
Also check the deals for one-way flights from Seattle to Istanbul in April.
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