Cheapest return flights from Seattle to Cancun in September from $351

Best time to book flights for Seattle (SEA) to Cancun (CUN) flights at AirHint

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

Return flights

02 Sep - 09 Sep Aeromexico
13 Sep - 20 Sep Aeromexico
15 Sep - 22 Sep Aeromexico
13 Sep - 19 Sep Aeromexico
20 Sep - 27 Sep Aeromexico
20 Sep - 27 Sep Aeromexico direct
13 Sep - 20 Sep Delta direct
26 Sep - 30 Sep Delta
30 Sep - 07 Oct Delta

Also check the deals for one-way 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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