AirHint found the following cheapest return flights from Seattle (SEA) to Mexico City (MEX) in August 2025 (see full year).

Return flights

28 Aug - 02 Sep	Volaris
23 Aug - 05 Sep	Frontier Airlines
12 Aug - 18 Aug	Spirit Airlines
19 Aug - 27 Aug	Frontier Airlines
18 Aug - 27 Aug	Frontier Airlines
27 Aug - 01 Sep	Frontier Airlines
16 Aug - 27 Aug	Hawaiian Airlines
14 Aug - 05 Sep	Frontier Airlines
12 Aug - 15 Aug	Spirit Airlines
08 Aug - 15 Aug	Volaris
13 Aug - 05 Sep	Hawaiian Airlines
08 Aug - 10 Sep	Aeromexico
10 Aug - 17 Aug	Volaris
13 Aug - 20 Aug	Volaris
11 Aug - 18 Aug	Spirit Airlines
13 Aug - 21 Aug	Volaris
23 Aug - 05 Sep	Delta	direct
14 Aug - 05 Sep	Delta	direct
13 Aug - 05 Sep	Delta	direct

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

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 August from 346€

Return flights