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

Return flights

31 Jan - 28 Feb	Volaris
12 Jan - 13 Jan	Aeromexico
12 Jan - 16 Jan	Hawaiian Airlines
18 Jan - 23 Jan	Frontier Airlines
22 Jan - 25 Jan	Volaris
18 Jan - 26 Jan	Frontier Airlines
17 Jan - 31 Jan	Volaris
24 Jan - 02 Feb	Hawaiian Airlines
08 Jan - 03 Feb	Frontier Airlines
02 Jan - 09 Jan	Frontier Airlines
01 Jan - 09 Jan	Frontier Airlines
04 Jan - 03 Feb	Aeromexico
12 Jan - 13 Jan	Aeromexico	direct
17 Jan - 31 Jan	Aeromexico	direct
31 Jan - 28 Feb	Aeromexico	direct
24 Jan - 02 Feb	Delta	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 $315

Return flights