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

Return flights

06 May - 13 May	Alaska Airlines
09 May - 14 May	Alaska Airlines
07 May - 11 May	Alaska Airlines
21 May - 25 May	Alaska Airlines
24 May - 27 May	Alaska Airlines
27 May - 03 Jun	Alaska Airlines
31 May - 11 Jun	Alaska Airlines
06 May - 13 May	Delta	direct
27 May - 03 Jun	Delta	direct
07 May - 11 May	Delta	direct
21 May - 25 May	Delta	direct
09 May - 14 May	Delta	direct

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

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 May from 390€

Return flights