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

Return flights

24 Dec - 03 Jan	Asiana Airlines
24 Dec - 02 Jan	Asiana Airlines
01 Dec - 30 Jan	China Airlines
01 Dec - 08 Dec	China Airlines
24 Dec - 03 Jan	Cathay Pacific	direct
23 Dec - 31 Dec	United	direct
24 Dec - 02 Jan	Cathay Pacific	direct
29 Dec - 13 Jan	United
18 Dec - 16 Jan	Philippine Airlines
18 Dec - 28 Jan	Philippine Airlines
01 Dec - 13 Dec	China Airlines
18 Dec - 22 Jan	Philippine Airlines
20 Dec - 29 Dec	United
22 Dec - 03 Jan	United
01 Dec - 13 Dec	Cathay Pacific	direct
19 Dec - 30 Dec	Delta
15 Dec - 23 Dec	Cathay Pacific	direct
07 Dec - 20 Dec	Delta
07 Dec - 20 Dec	Cathay Pacific	direct

Also check the deals for one-way flights from Hong Kong to San Francisco 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 Hong Kong to San Francisco in December from 596€

Return flights