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

Return flights

11 Dec - 15 Dec	Air Canada
04 Dec - 08 Dec	Air Canada
10 Dec - 17 Dec	Air Canada
10 Dec - 20 Dec	Air Canada
05 Dec - 14 Dec	Frontier Airlines
11 Dec - 14 Dec	Air Canada
10 Dec - 14 Dec	Air Canada
03 Dec - 07 Dec	Southwest Airlines
03 Dec - 08 Dec	Southwest Airlines
17 Dec - 23 Dec	Southwest Airlines
29 Dec - 01 Jan	Delta
31 Dec - 04 Jan	Aeromexico
30 Dec - 06 Jan	Delta
26 Dec - 05 Jan	Air Canada
30 Dec - 05 Jan	Delta
31 Dec - 02 Jan	Frontier Airlines
28 Dec - 02 Jan	jetBlue
30 Dec - 04 Jan	Frontier Airlines
22 Dec - 04 Jan	Frontier Airlines
30 Dec - 02 Jan	Delta

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 363€

Return flights