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

Return flights

21 Sep - 27 Oct	Air France
16 Sep - 30 Sep	Delta
21 Sep - 24 Oct	Delta
16 Sep - 08 Oct	Delta
21 Sep - 21 Oct	Delta
21 Sep - 22 Oct	Delta
21 Sep - 23 Oct	Delta
09 Sep - 16 Sep	Delta
14 Sep - 20 Sep	Frontier Airlines
27 Sep - 27 Oct	Delta
11 Sep - 19 Sep	Delta
26 Sep - 27 Oct	Delta

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 535€

Return flights