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

Return flights

22 Sep - 13 Oct	SWISS
21 Sep - 17 Oct	Lufthansa
22 Sep - 06 Oct	SWISS
22 Sep - 18 Oct	SWISS
22 Sep - 05 Oct	SWISS
21 Sep - 19 Oct	Lufthansa
21 Sep - 05 Oct	Austrian Airlines
29 Sep - 06 Oct	Lufthansa
26 Sep - 27 Oct	Austrian Airlines
20 Sep - 17 Oct	Air Canada
18 Sep - 25 Sep	Spirit Airlines
25 Sep - 28 Sep	TAP
17 Sep - 24 Sep	Air France
20 Sep - 21 Sep	Spirit Airlines
15 Sep - 22 Sep	Lufthansa
23 Sep - 30 Sep	Austrian Airlines
22 Sep - 29 Sep	Austrian Airlines
26 Sep - 29 Sep	Austrian Airlines
21 Sep - 24 Sep	Lufthansa
18 Sep - 21 Sep	Lufthansa

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

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 Budapest in September from $509

Return flights