AirHint found the following cheapest return flights from Seattle (SEA) to Osaka (KIX) in May 2026 (see full year).
Return flights
| 07 May - 14 May | Philippine Airlines | ||
| 15 May - 26 May | Frontier Airlines | ||
| 29 May - 07 Jun | ANA |
Also check the deals for one-way flights from Seattle to Osaka in May.
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