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

Return flights

03 Sep - 10 Sep	Cathay Pacific
02 Sep - 02 Oct	Cathay Pacific
09 Sep - 16 Sep	Cathay Pacific
08 Sep - 30 Sep	Cathay Pacific
09 Sep - 24 Oct	Turkish Airlines
26 Sep - 09 Oct	Air India
26 Sep - 26 Oct	Air India
30 Sep - 28 Oct	IndiGo

Also check the deals for one-way flights from Chicago to Kathmandu 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 Kathmandu in September from 667€

Return flights