AirHint found the following cheapest one-way flights from Seattle (SEA) to Guadalajara (GDL) in October 2025 (see full year).

One-Way flights

13 Oct	Frontier Airlines
08 Oct	Frontier Airlines
24 Oct	Frontier Airlines
13 Oct	Frontier Airlines	direct
04 Oct	Frontier Airlines
10 Oct	Frontier Airlines
31 Oct	Frontier Airlines
30 Oct	Frontier Airlines
23 Oct	Frontier Airlines
23 Oct	Volaris	direct

Also check the deals for return flights from Seattle to Guadalajara in October.

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 one-way flights from Seattle to Guadalajara in October from 122€

One-Way flights