Cheapest one-way flights from Washington to Mexico City in December from $172

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

One-Way flights

07 Dec Frontier Airlines
08 Dec Frontier Airlines
11 Dec Aeromexico
15 Dec Aeromexico
10 Dec Frontier Airlines
14 Dec Frontier Airlines
08 Dec Aeromexico direct
20 Dec Frontier Airlines
28 Dec Aeromexico direct
18 Dec Frontier Airlines

Also check the deals for return flights from Washington to Mexico City in December.

Skyscanner

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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