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

Return flights

01 Sep - 07 Sep	Air India
09 Sep - 16 Sep	Air India
02 Sep - 07 Sep	Air India
05 Sep - 09 Sep	Air India
09 Sep - 13 Sep	Air India
03 Sep - 15 Sep	Air India
03 Sep - 17 Sep	Air India
03 Sep - 14 Sep	Air India
05 Sep - 07 Sep	Air India
07 Sep - 12 Sep	Air India
26 Sep - 01 Oct	Nepal Airlines
26 Sep - 05 Oct	Nepal Airlines
21 Sep - 03 Oct	Nepal Airlines
20 Sep - 03 Oct	IndiGo
18 Sep - 04 Oct	Air India
25 Sep - 19 Oct	IndiGo	direct
29 Sep - 15 Oct	IndiGo
27 Sep - 06 Oct	IndiGo	direct
30 Sep - 16 Oct	IndiGo	direct
27 Sep - 04 Oct	IndiGo	direct

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 135€

Return flights