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

Return flights

27 Aug - 06 Sep	Air India
26 Aug - 06 Sep	IndiGo
29 Aug - 31 Aug	IndiGo
20 Aug - 27 Aug	IndiGo
20 Aug - 25 Aug	IndiGo
24 Aug - 28 Aug	SriLankan Airlines
22 Aug - 03 Sep	IndiGo
22 Aug - 25 Aug	IndiGo
19 Aug - 26 Aug	IndiGo
16 Aug - 23 Aug	IndiGo
16 Aug - 22 Aug	IndiGo
27 Aug - 30 Aug	Air India
22 Aug - 30 Aug	Singapore Airlines	direct
22 Aug - 03 Sep	Singapore Airlines	direct
27 Aug - 06 Sep	Singapore Airlines	direct
26 Aug - 06 Sep	Singapore Airlines	direct

Also check the deals for one-way flights from Singapore 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.

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Cheapest return flights from Singapore to Kathmandu in August from 267€

Return flights