AirHint found the following cheapest one-way flights from Seattle (SEA) to Singapore (SIN) in December 2025 (see full year).
One-Way flights
| 29 Dec | ANA | ||
| 25 Dec | Hainan Airlines | ||
| 17 Dec | Alaska Airlines | ||
| 19 Dec | Alaska Airlines | ||
| 23 Dec | Delta |
Also check the deals for return flights from Seattle to Singapore in December.
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