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

Return flights

05 Dec - 14 Dec	Aeromexico
05 Dec - 08 Dec	Aeromexico
11 Dec - 17 Dec	Aeromexico
06 Dec - 09 Dec	Aeromexico
11 Dec - 15 Dec	Aeromexico
03 Dec - 08 Dec	Aeromexico
11 Dec - 21 Dec	Aeromexico
04 Dec - 08 Dec	Aeromexico
03 Dec - 07 Dec	Aeromexico
04 Dec - 09 Dec	Aeromexico
06 Dec - 11 Jan	Delta
06 Dec - 11 Jan	United	direct
28 Dec - 02 Jan	Aeromexico
29 Dec - 05 Jan	Aeromexico
29 Dec - 05 Jan	United	direct
22 Dec - 01 Jan	Frontier Airlines
30 Dec - 03 Jan	Southwest Airlines
26 Dec - 03 Jan	Southwest Airlines

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 $271

Return flights