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

Return flights

01 Sep - 25 Oct	Biman Bangladesh Airlines
15 Sep - 24 Sep	Biman Bangladesh Airlines
01 Sep - 30 Sep	IndiGo
01 Sep - 20 Sep	IndiGo
05 Sep - 29 Sep	Flynas
03 Sep - 22 Sep	flydubai
05 Sep - 22 Sep	flydubai
05 Sep - 07 Oct	Flynas
01 Sep - 10 Sep	Saudia
11 Sep - 05 Oct	Air India
14 Sep - 24 Sep	IndiGo
12 Sep - 03 Oct	Etihad Airways
08 Sep - 15 Sep	flydubai
10 Sep - 01 Oct	Air India
10 Sep - 02 Oct	Air India
06 Sep - 11 Sep	Air India
20 Sep - 12 Oct	Biman Bangladesh Airlines
15 Sep - 14 Oct	Biman Bangladesh Airlines
15 Sep - 18 Oct	Biman Bangladesh Airlines
10 Sep - 06 Oct	IndiGo

Also check the deals for one-way flights from Riyadh 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 Riyadh to Kathmandu in September from $381

Return flights