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

Return flights

01 Oct - 07 Oct	Volaris
01 Oct - 06 Oct	Volaris
04 Oct - 13 Oct	Volaris
13 Oct - 25 Nov	Frontier Airlines
03 Oct - 15 Oct	Volaris
14 Oct - 22 Oct	Volaris
07 Oct - 14 Oct	Hawaiian Airlines
15 Oct - 19 Oct	Alaska Airlines
13 Oct - 21 Oct	Frontier Airlines
08 Oct - 17 Oct	Hawaiian Airlines
29 Oct - 02 Nov	Hawaiian Airlines
09 Oct - 13 Oct	Hawaiian Airlines
30 Oct - 03 Nov	Frontier Airlines
31 Oct - 11 Nov	Volaris
29 Oct - 04 Nov	Hawaiian Airlines
29 Oct - 05 Nov	Hawaiian Airlines
29 Oct - 09 Nov	Hawaiian Airlines
25 Oct - 08 Nov	Volaris
30 Oct - 06 Nov	Aeromexico
30 Oct - 02 Nov	Frontier Airlines

Also check the deals for one-way flights from Seattle 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 Seattle to Mexico City in October from $343

Return flights