AirHint found the following cheapest return flights from Chicago (ORD) to Bucharest (OTP) in May 2026 (see full year).

Return flights

05 May - 12 May	Icelandair
06 May - 13 May	Turkish Airlines
11 May - 18 May	Lufthansa
11 May - 25 May	SWISS
03 May - 10 May	Air Canada
04 May - 11 May	Lufthansa
12 May - 19 May	Air Canada
01 May - 08 May	Lufthansa
02 May - 09 May	Lufthansa
13 May - 20 May	Air Canada
25 May - 01 Jun	Air Serbia
27 May - 03 Jun	Air Canada
29 May - 05 Jun	Air Canada
28 May - 04 Jun	Air Canada
31 May - 07 Jun	Lufthansa
30 May - 06 Jun	Air Serbia

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

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 May from 398€

Return flights