AirHint found the following cheapest return flights from Chicago (ORD) to Istanbul (IST) in May 2026 (see full year).
Return flights
| 15 May - 23 May | Scandinavian Airlines | ||
| 05 May - 19 May | Delta | ||
| 01 May - 23 May | Air France | ||
| 01 May - 23 May | Turkish Airlines | direct |
Also check the deals for one-way flights from Chicago to Istanbul in May.
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