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

Return flights

09 Oct - 14 Oct	Aeromexico	direct
16 Oct - 23 Oct	Avianca
10 Oct - 13 Oct	Aeromexico	direct
20 Oct - 26 Oct	Frontier Airlines
16 Oct - 23 Oct	Aeromexico	direct
10 Oct - 12 Oct	Volaris El Salvador
14 Oct - 28 Oct	United	direct
01 Oct - 15 Oct	United	direct
07 Oct - 21 Oct	United	direct
08 Oct - 22 Oct	United	direct
29 Oct - 09 Nov	Aeromexico
29 Oct - 09 Nov	Delta	direct

Also check the deals for one-way flights from Washington to Mexico City in October.

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 Mexico City in October from $455

Return flights