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

Return flights

28 Oct - 04 Nov	Frontier Airlines
30 Oct - 06 Nov	Frontier Airlines
24 Oct - 15 Nov	Delta
27 Oct - 03 Nov	Delta
26 Oct - 02 Nov	Frontier Airlines
29 Oct - 05 Nov	Delta
21 Oct - 28 Oct	Delta
23 Oct - 30 Oct	Delta
24 Oct - 31 Oct	Delta
14 Oct - 21 Oct	Frontier Airlines
05 Oct - 12 Oct	Frontier Airlines
07 Oct - 14 Oct	Delta
08 Oct - 15 Oct	Delta
15 Oct - 22 Oct	Delta
16 Oct - 23 Oct	Delta
20 Oct - 27 Oct	Frontier Airlines
25 Oct - 01 Nov	Delta
31 Oct - 07 Nov	Frontier Airlines
31 Oct - 14 Nov	Air France

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

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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Cheapest return flights from Chicago to Bucharest in October from $547

Return flights