Cheapest return flights from Seattle to Cancun in September from $395

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

Return flights

30 Sep - 07 Oct Aeromexico
27 Sep - 07 Oct Frontier Airlines
25 Sep - 29 Sep American Airlines
25 Sep - 30 Sep WestJet
11 Sep - 15 Sep WestJet
13 Sep - 20 Sep WestJet
15 Sep - 20 Sep Frontier Airlines
13 Sep - 20 Sep Aeromexico direct
12 Sep - 15 Sep Frontier Airlines
14 Sep - 21 Sep Aeromexico
18 Sep - 21 Sep United
11 Sep - 14 Sep Aeromexico

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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