Cheapest return flights from Seattle to Mexico City in May from $328

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

Return flights

01 May - 10 May Frontier Airlines
10 May - 14 May Frontier Airlines
04 May - 09 May Frontier Airlines
26 May - 02 Jun Frontier Airlines
17 May - 22 May Alaska Airlines
26 May - 02 Jun Delta direct
01 May - 10 May Delta direct

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

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