AirHint found the following cheapest return flights from Seattle (SEA) to Hanoi (HAN) in October 2025 (see full year).
Return flights
| 08 Oct - 15 Oct | Philippine Airlines | ||
| 19 Oct - 30 Oct | Philippine Airlines | ||
| 07 Oct - 14 Oct | EVA Air | ||
| 16 Oct - 19 Oct | STARLUX Airlines |
Also check the deals for one-way flights from Seattle to Hanoi in October.
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