Cheapest return flights from Singapore to Kathmandu in September from $408

Best time to book flights for Singapore (SIN) to Kathmandu (KTM) flights at AirHint

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

Return flights

16 Sep - 01 Oct SriLankan Airlines
13 Sep - 29 Sep SriLankan Airlines
04 Sep - 10 Sep Air India
11 Sep - 25 Sep Air India
11 Sep - 27 Sep Air India
04 Sep - 10 Sep Singapore Airlines direct
11 Sep - 27 Sep Singapore Airlines direct
11 Sep - 25 Sep Singapore Airlines direct
16 Sep - 01 Oct Singapore Airlines direct
13 Sep - 29 Sep Singapore Airlines direct

Also check the deals for one-way flights from Singapore to Kathmandu in September.

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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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