AirHint found the following cheapest return flights from Hong Kong (HKG) to Seattle (SEA) in September 2026 (see full year).
Return flights
| 25 Sep - 02 Oct | Philippine Airlines | ||
| 26 Sep - 03 Oct | Korean Air | ||
| 26 Sep - 03 Oct | Cathay Pacific | direct |
Also check the deals for one-way flights from Hong Kong to Seattle in September.
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