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	Frontier Airlines
20 Jan - 23 Feb	Hawaiian Airlines
22 Jan - 12 Feb	Hawaiian Airlines
22 Jan - 13 Feb	Hawaiian Airlines
21 Jan - 28 Jan	Volaris
26 Jan - 06 Feb	Frontier Airlines
22 Jan - 11 Feb	Aeromexico
22 Jan - 10 Feb	Hawaiian Airlines
27 Jan - 05 Feb	Hawaiian Airlines
29 Jan - 04 Feb	Hawaiian Airlines
22 Jan - 14 Feb	Hawaiian Airlines
22 Jan - 31 Jan	Hawaiian Airlines
22 Jan - 26 Jan	Frontier Airlines
22 Jan - 25 Jan	Frontier Airlines
21 Jan - 28 Jan	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 337€

Return flights