AirHint found the following cheapest return flights from Seattle (SEA) to Manila (MNL) in September 2026 (see full year).
Return flights
| 18 Sep - 20 Sep | Korean Air | ||
| 05 Sep - 20 Sep | Korean Air | ||
| 15 Sep - 30 Sep | Korean Air | ||
| 15 Sep - 30 Sep | Philippine Airlines | direct | |
| 18 Sep - 20 Sep | Philippine Airlines | direct |
Also check the deals for one-way flights from Seattle to Manila in September.
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