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

Return flights

19 Oct - 25 Oct	Scandinavian Airlines
11 Oct - 25 Oct	Scandinavian Airlines
12 Oct - 25 Oct	Scandinavian Airlines
20 Oct - 03 Nov	Turkish Airlines
19 Oct - 19 Nov	Turkish Airlines
17 Oct - 31 Oct	Turkish Airlines
26 Oct - 07 Nov	Turkish Airlines
12 Oct - 19 Oct	Turkish Airlines
04 Oct - 25 Oct	Scandinavian Airlines
01 Oct - 08 Oct	Spirit Airlines
08 Oct - 17 Oct	Lufthansa
05 Oct - 12 Oct	Turkish Airlines
03 Oct - 10 Oct	Frontier Airlines
01 Oct - 10 Nov	Air Canada

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.

Book a cheap hotel in Bucharest

Cheap car rent in Bucharest

Cheapest return flights from Chicago to Bucharest in October from $441

Return flights