AirHint found the following cheapest one-way flights from Seattle (SEA) to Mexico City (MEX) in September 2026 (see full year).
One-Way flights
| 30 Sep | Volaris | ||
| 27 Sep | Volaris | ||
| 06 Sep | Volaris | ||
| 20 Sep | Volaris | ||
| 04 Sep | WestJet | ||
| 03 Sep | Delta | direct | |
| 06 Sep | Delta | direct | |
| 04 Sep | Delta | direct | |
| 20 Sep | Delta | direct |
Also check the deals for return flights from Seattle to Mexico City in September.
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