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

Return flights

10 Sep - 24 Sep	Lufthansa
02 Sep - 09 Sep	United
07 Sep - 21 Sep	Scandinavian Airlines
23 Sep - 30 Sep	United
03 Sep - 09 Sep	Air France
01 Sep - 13 Sep	Air Canada
23 Sep - 04 Oct	Air Canada
05 Sep - 12 Sep	United
08 Sep - 15 Sep	United
24 Sep - 25 Oct	Air Canada
04 Sep - 10 Sep	Air France
21 Sep - 27 Sep	British Airways
25 Sep - 25 Oct	Turkish Airlines
26 Sep - 26 Oct	Lufthansa
28 Sep - 05 Oct	United

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 $543

Return flights