AirHint found the following cheapest return flights from Chicago (MDW) to Bucharest (OTP) in September 2026 (see full year).
Return flights
| 16 Sep - 23 Sep | Delta | ||
| 17 Sep - 24 Sep | Delta | ||
| 24 Sep - 01 Oct | Delta | ||
| 13 Sep - 20 Sep | Delta | ||
| 30 Sep - 07 Oct | Frontier Airlines |
Also check the deals for one-way flights from Chicago to Bucharest in September.
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