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

Return flights

29 Sep - 13 Oct	Lufthansa
29 Sep - 14 Oct	Lufthansa
22 Sep - 13 Oct	Etihad Airways
24 Sep - 07 Oct	Etihad Airways
22 Sep - 22 Oct	Etihad Airways
22 Sep - 06 Oct	Etihad Airways
23 Sep - 23 Oct	Etihad Airways
24 Sep - 24 Oct	SWISS
29 Sep - 29 Oct	SWISS
30 Sep - 30 Oct	SWISS
21 Sep - 29 Sep	Etihad Airways
17 Sep - 22 Sep	Etihad Airways
15 Sep - 19 Sep	Cathay Pacific
16 Sep - 23 Sep	Etihad Airways
15 Sep - 24 Sep	Cathay Pacific
15 Sep - 22 Sep	Cathay Pacific
15 Sep - 30 Sep	Cathay Pacific
15 Sep - 23 Sep	Delta
15 Sep - 24 Sep	Air India	direct
15 Sep - 22 Sep	Air India	direct

Also check the deals for one-way flights from Chicago to Delhi 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 Delhi in September from 586€

Return flights