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

Return flights

03 Sep - 23 Sep	IndiGo
01 Sep - 08 Sep	Cathay Pacific
08 Sep - 16 Sep	IndiGo
02 Sep - 09 Sep	Cathay Pacific
08 Sep - 11 Sep	IndiGo
22 Sep - 25 Sep	Thai AirAsia
09 Sep - 18 Sep	IndiGo
22 Sep - 29 Sep	Scoot
05 Sep - 14 Sep	IndiGo
22 Sep - 30 Sep	Thai AirAsia
24 Sep - 08 Oct	Thai AirAsia
23 Sep - 17 Oct	Air India
19 Sep - 07 Oct	Thai AirAsia
23 Sep - 07 Oct	Air India
26 Sep - 09 Oct	Thai AirAsia
26 Sep - 02 Oct	IndiGo
26 Sep - 03 Oct	IndiGo
30 Sep - 07 Oct	Singapore Airlines	direct
19 Sep - 07 Oct	Singapore Airlines	direct

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

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 Singapore to Kathmandu in September from $391

Return flights