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United Airlines have round trip airfares travelling from Seattle (SEA) to Mexico City (MEX) for $ 250 including taxes and fees. This makes 1 stop and depending on the flight/date you choose, it could be an long, overnight stop. Ymmv on that. Good thing is that this is NOT a basic economy fare.

Travel Availability:

Departs SEA: Sept 13, 14, 19, 21, 26, 27, 29; Oct 3, 4, 7, 11, 14, 24, 31; Nov 1-3, 6-9, 15-16, 23, 30; Dec 5
Returns: Sept 16, 18-23, 25-30; Oct 2, 3, 6, 10, 11, 13, 14, 18, 20, 21, 25, 26; Nov 2-4, 6-11, 13-16, 22-23, 30; Dec 1-2, 4-9, 12