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

Return flights

21 Aug - 26 Aug	Air India
22 Aug - 28 Aug	Air India
23 Aug - 26 Aug	IndiGo
22 Aug - 30 Aug	IndiGo
28 Aug - 30 Aug	IndiGo
28 Aug - 11 Sep	IndiGo
21 Aug - 26 Aug	IndiGo	direct
27 Aug - 15 Sep	IndiGo
21 Aug - 16 Sep	IndiGo
28 Aug - 31 Aug	Air India
18 Aug - 21 Aug	Air India
20 Aug - 21 Aug	Air India
20 Aug - 23 Aug	Air India
30 Aug - 19 Sep	Air India
29 Aug - 12 Sep	Air India
21 Aug - 16 Sep	IndiGo	direct
31 Aug - 13 Sep	Nepal Airlines
27 Aug - 03 Sep	IndiGo
24 Aug - 08 Sep	IndiGo
21 Aug - 05 Sep	IndiGo

Also check the deals for one-way flights from Mumbai to Kathmandu in August.

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.

Book a cheap hotel in Kathmandu

Cheap car rent in Kathmandu

Cheapest return flights from Mumbai to Kathmandu in August from $158

Return flights