AirHint found the following cheapest return flights from Seattle (SEA) to Mexico City (MEX) in September 2026 (see full year).
Return flights
| 19 Sep - 26 Sep | Alaska Airlines | ||
| 17 Sep - 20 Sep | Alaska Airlines | ||
| 19 Sep - 26 Sep | Delta | direct | |
| 17 Sep - 20 Sep | Delta | direct | |
| 08 Sep - 14 Sep | Alaska Airlines |
Also check the deals for one-way flights from Seattle to Mexico City in September.
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