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

Return flights

14 Dec - 30 Dec	Delta	direct
22 Dec - 01 Jan	Delta	direct
25 Dec - 01 Jan	Delta	direct
25 Dec - 04 Jan	United
26 Dec - 31 Dec	Delta
03 Dec - 02 Jan	United
26 Dec - 31 Dec	Aeromexico	direct
22 Dec - 26 Dec	Aeromexico
29 Dec - 04 Jan	United
25 Dec - 04 Jan	Delta	direct
03 Dec - 02 Jan	Delta	direct
27 Dec - 03 Jan	Delta	direct
22 Dec - 26 Dec	Delta	direct

Also check the deals for one-way flights from Mexico City to Washington 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 Mexico City to Washington in December from 438€

Return flights