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

Return flights

11 Sep - 16 Sep	Air India
01 Sep - 12 Sep	Air India
01 Sep - 02 Sep	Air India
08 Sep - 12 Sep	Air India
06 Sep - 12 Sep	Air India
11 Sep - 19 Sep	Air India
11 Sep - 25 Sep	Air India
10 Sep - 12 Sep	Air India
05 Sep - 12 Sep	Air India
10 Sep - 24 Sep	Air India
19 Sep - 11 Oct	Nepal Airlines
24 Sep - 15 Oct	Nepal Airlines
21 Sep - 12 Oct	Nepal Airlines
24 Sep - 15 Oct	Nepal Airlines	direct
24 Sep - 13 Oct	Nepal Airlines
13 Sep - 03 Oct	Air India Express
13 Sep - 02 Oct	Air India Express
20 Sep - 07 Oct	Air India Express
21 Sep - 07 Oct	Air India Express
10 Sep - 01 Oct	Air India Express

Also check the deals for one-way flights from Mumbai 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 Mumbai to Kathmandu in September from $165

Return flights