AirHint found the following cheapest return flights from Washington (DCA) to Cancun (CUN) in December 2025 (see full year).

Return flights

07 Dec - 10 Dec	jetBlue
13 Dec - 14 Dec	jetBlue
10 Dec - 17 Dec	jetBlue
09 Dec - 13 Dec	jetBlue
11 Dec - 17 Dec	jetBlue
01 Dec - 04 Dec	jetBlue
13 Dec - 16 Dec	jetBlue
03 Dec - 08 Dec	jetBlue
06 Dec - 13 Dec	jetBlue
16 Dec - 22 Dec	jetBlue
30 Dec - 04 Jan	Air Canada
31 Dec - 07 Jan	jetBlue
29 Dec - 06 Jan	jetBlue
30 Dec - 05 Jan	jetBlue
31 Dec - 04 Jan	Air Canada
29 Dec - 05 Jan	jetBlue
22 Dec - 05 Jan	jetBlue
23 Dec - 06 Jan	jetBlue
20 Dec - 01 Jan	Frontier Airlines
24 Dec - 03 Jan	Air Canada

Also check the deals for one-way flights from Washington to Cancun in December.

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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Cheapest return flights from Washington to Cancun in December from $300

Return flights