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

One-Way flights

12 Sep	Nepal Airlines	direct
11 Sep	Air India
09 Sep	SriLankan Airlines
07 Sep	Air India
19 Sep	Nepal Airlines	direct
18 Sep	Air India Express
09 Sep	IndiGo	direct
08 Sep	IndiGo	direct
13 Sep	Air India Express
02 Sep	IndiGo	direct

Also check the deals for return 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 one-way flights from Mumbai to Kathmandu in September from 64€

One-Way flights