Cheapest return flights from Chicago to Bucharest in September from $581

AirHint found the following cheapest return flights from Chicago (ORD) to Bucharest (OTP) in September 2025 (see full year).

Return flights

02 Sep - 09 Sep Icelandair
13 Sep - 23 Sep Turkish Airlines
28 Sep - 12 Oct Turkish Airlines
30 Sep - 07 Oct Frontier Airlines
29 Sep - 06 Oct TAP
28 Sep - 05 Oct Turkish Airlines
23 Sep - 30 Sep Spirit Airlines
22 Sep - 29 Sep Turkish Airlines
24 Sep - 01 Oct Frontier Airlines
20 Sep - 04 Oct Air Serbia
27 Sep - 04 Oct Frontier Airlines
06 Sep - 27 Sep Spirit Airlines
18 Sep - 21 Sep Spirit Airlines
20 Sep - 11 Oct Air Serbia
18 Sep - 02 Oct Spirit Airlines
25 Sep - 02 Oct Frontier Airlines
21 Sep - 28 Sep TAP
16 Sep - 27 Sep Turkish Airlines
10 Sep - 27 Sep Frontier Airlines
01 Sep - 21 Sep Air Canada

Also check the deals for one-way flights from Chicago to Bucharest in September.

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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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