Cheapest one-way flights from Seattle to Cancun in September from $140

AirHint found the following cheapest one-way flights from Seattle (SEA) to Cancun (CUN) in September 2025 (see full year).

One-Way flights

20 Sep Aeromexico direct
22 Sep Aeromexico

Also check the deals for return flights from Seattle to Cancun in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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