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

Return flights

10 Aug - 27 Aug	AirAsia X
12 Aug - 18 Sep	SriLankan Airlines
13 Aug - 21 Aug	Air India
20 Aug - 30 Aug	Air India
09 Aug - 26 Aug	Air India
13 Aug - 22 Aug	Air India
10 Aug - 16 Aug	Air India
16 Aug - 30 Aug	Air India
03 Aug - 15 Aug	Air India
09 Aug - 29 Aug	Air India
16 Aug - 13 Sep	Air India
16 Aug - 10 Sep	Air India
10 Aug - 05 Sep	Air India
24 Aug - 09 Sep	Air India
27 Aug - 03 Sep	Air India
06 Aug - 13 Sep	Air India
06 Aug - 12 Sep	Air India
06 Aug - 16 Sep	Air India
06 Aug - 14 Sep	Air India
19 Aug - 26 Aug	Air India

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 $527

Return flights