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

Return flights

03 Sep - 16 Sep	Air India
05 Sep - 07 Sep	Air India
03 Sep - 10 Sep	Air India
06 Sep - 16 Sep	Air India
10 Sep - 14 Sep	Air India
11 Sep - 14 Sep	Air India
01 Sep - 10 Sep	Air India
06 Sep - 10 Sep	Air India
01 Sep - 08 Sep	SriLankan Airlines
11 Sep - 18 Sep	SriLankan Airlines
19 Sep - 13 Oct	Nepal Airlines	direct
30 Sep - 04 Oct	IndiGo	direct
29 Sep - 06 Oct	IndiGo	direct
22 Sep - 09 Oct	IndiGo	direct
01 Sep - 30 Oct	SriLankan Airlines
27 Sep - 03 Oct	IndiGo	direct
30 Sep - 05 Oct	IndiGo	direct
24 Sep - 27 Oct	Nepal Airlines	direct
26 Sep - 04 Oct	IndiGo
01 Sep - 31 Oct	IndiGo

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 161€

Return flights