AirHint found the following cheapest return flights from San Francisco (SFO) to Kathmandu (KTM) in December 2025 (see full year).

Return flights

12 Dec - 16 Jan	Lufthansa
14 Dec - 17 Jan	Lufthansa
10 Dec - 31 Dec	SWISS
22 Dec - 05 Jan	SWISS
15 Dec - 05 Jan	SWISS
15 Dec - 07 Jan	SWISS
13 Dec - 31 Dec	SWISS
13 Dec - 07 Jan	SWISS
13 Dec - 05 Jan	SWISS
13 Dec - 06 Jan	SWISS
19 Dec - 05 Jan	SWISS
19 Dec - 04 Jan	SWISS
17 Dec - 31 Dec	Lufthansa

Also check the deals for one-way flights from San Francisco to Kathmandu in December.

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 San Francisco to Kathmandu in December from $1369

Return flights