AirHint found the following cheapest return flights from Seattle (SEA) to Agana (GUM) in December 2025 (see full year).
Return flights
| 01 Dec - 08 Dec | Asiana Airlines | ||
| 23 Dec - 31 Dec | Delta | ||
| 20 Dec - 04 Jan | Frontier Airlines | ||
| 19 Dec - 03 Jan | United |
Also check the deals for one-way flights from Seattle to Agana in December.
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