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

Return flights

24 Aug - 04 Sep	SriLankan Airlines
12 Aug - 21 Aug	SriLankan Airlines
12 Aug - 18 Aug	SriLankan Airlines
09 Aug - 18 Aug	SriLankan Airlines
13 Aug - 10 Sep	AirAsia X
12 Aug - 26 Aug	Air India
16 Aug - 29 Aug	Air India
10 Aug - 23 Aug	Air India
09 Aug - 19 Aug	Air India
19 Aug - 09 Sep	Air India
19 Aug - 08 Sep	Air India
22 Aug - 17 Sep	AirAsia X
10 Aug - 30 Aug	Air India
09 Aug - 15 Aug	Air India
12 Aug - 05 Sep	Air India
12 Aug - 06 Sep	Air India
13 Aug - 06 Sep	Air India
27 Aug - 08 Sep	Air India
13 Aug - 13 Sep	Air India
05 Aug - 26 Aug	AirAsia X

Also check the deals for one-way flights from Sydney 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 Sydney to Kathmandu in August from 495€

Return flights