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

One-Way flights

15 Aug	Volaris
23 Aug	Volaris
25 Aug	Frontier Airlines
07 Aug	Hawaiian Airlines
05 Aug	Hawaiian Airlines
09 Aug	Hawaiian Airlines
16 Aug	Hawaiian Airlines
06 Aug	Hawaiian Airlines
08 Aug	Spirit Airlines
01 Aug	Frontier Airlines

Also check the deals for return 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.

Book a cheap hotel in Mexico City

Cheap car rent in Mexico City

Cheapest one-way flights from Seattle to Mexico City in August from 115€

One-Way flights