AirHint found the following cheapest return flights from Seattle (SEA) to Mexico City (MEX) in January 2026 (see full year).

Return flights

29 Jan - 04 Feb	Frontier Airlines
22 Jan - 25 Jan	Frontier Airlines
19 Jan - 25 Jan	Frontier Airlines
28 Jan - 01 Feb	Hawaiian Airlines
21 Jan - 25 Jan	Volaris
23 Jan - 28 Jan	Frontier Airlines
25 Jan - 02 Feb	Volaris
12 Jan - 19 Jan	Frontier Airlines
22 Jan - 26 Jan	Frontier Airlines
23 Jan - 27 Jan	Volaris
17 Jan - 31 Jan	Volaris
10 Jan - 21 Jan	Frontier Airlines
13 Jan - 20 Jan	Aeromexico
25 Jan - 02 Feb	Aeromexico	direct
31 Jan - 28 Feb	Aeromexico	direct
29 Jan - 04 Feb	Aeromexico	direct

Also check the deals for one-way flights from Seattle to Mexico City in January.

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 January from $320

Return flights