Cheapest one-way flights from Seattle to Cancun in December from $159

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

One-Way flights

12 Dec Frontier Airlines
05 Dec Frontier Airlines
14 Dec Frontier Airlines
11 Dec Frontier Airlines
03 Dec Hawaiian Airlines
31 Dec Sun Country Airlines
11 Dec Hawaiian Airlines direct
02 Dec Hawaiian Airlines direct
03 Dec Delta direct
18 Dec Hawaiian Airlines

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

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