AirHint found the following cheapest one-way flights from Washington (DCA) to Cancun (CUN) in December 2025 (see full year).
One-Way flights
| 02 Dec | Air Canada | ||
| 31 Dec | Frontier Airlines | ||
| 18 Dec | United | ||
| 27 Dec | Air Canada | ||
| 19 Dec | Frontier Airlines |
Also check the deals for return flights from Washington to Cancun in December.
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