AirHint found the following cheapest return flights from San Francisco (SFO) to Hanoi (HAN) in December 2025 (see full year).
Return flights
| 27 Dec - 30 Jan | United | ||
| 24 Dec - 31 Dec | Cathay Pacific | ||
| 22 Dec - 29 Dec | Cathay Pacific | ||
| 21 Dec - 28 Dec | Cathay Pacific | ||
| 21 Dec - 30 Dec | Air India | ||
| 21 Dec - 01 Jan | Hawaiian Airlines | ||
| 20 Dec - 22 Dec | Delta |
Also check the deals for one-way flights from San Francisco to Hanoi in December.
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