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

Return flights

12 Aug - 17 Aug	Air India
12 Aug - 18 Aug	Air India
24 Aug - 31 Aug	Air India
27 Aug - 30 Aug	Air India
09 Aug - 18 Aug	Air India
16 Aug - 25 Aug	Air India
01 Aug - 07 Aug	Air India
26 Aug - 29 Aug	Air India
26 Aug - 28 Aug	Air India
15 Aug - 22 Aug	Air India
30 Aug - 07 Sep	Air India
29 Aug - 07 Sep	Air India
26 Aug - 02 Sep	Air India
25 Aug - 01 Sep	Air India
26 Aug - 02 Sep	Singapore Airlines	direct
25 Aug - 01 Sep	Singapore Airlines	direct
29 Aug - 07 Sep	Singapore Airlines	direct
30 Aug - 07 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 $275

Return flights