AirHint found the following cheapest return flights from Singapore (SIN) to Kathmandu (KTM) in May 2026 (see full year).

Return flights

31 May - 08 Jun	Scoot
12 May - 31 May	SriLankan Airlines
23 May - 31 May	SriLankan Airlines
17 May - 24 May	SriLankan Airlines
17 May - 25 May	SriLankan Airlines
27 May - 07 Jun	SriLankan Airlines
22 May - 30 May	Air India
01 May - 10 May	Air India
15 May - 31 May	Air India
13 May - 25 May	Air India
28 May - 06 Jun	Air India
27 May - 06 Jun	Air India
22 May - 01 Jun	Air India
23 May - 01 Jun	Air India
24 May - 01 Jun	Air India
31 May - 01 Jun	Air India
26 May - 02 Jun	Air India
16 May - 31 May	Thai AirAsia
23 May - 26 May	Thai Airways
31 May - 08 Jun	Singapore Airlines	direct

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

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 May from $380

Return flights