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

Return flights

10 Oct - 17 Oct	Volaris	direct
12 Oct - 19 Oct	Volaris	direct
15 Oct - 22 Oct	Alaska Airlines
30 Oct - 07 Nov	Frontier Airlines
13 Oct - 20 Oct	Frontier Airlines
04 Oct - 13 Oct	Frontier Airlines
20 Oct - 02 Nov	Frontier Airlines
04 Oct - 11 Oct	Frontier Airlines
09 Oct - 16 Oct	Volaris	direct
04 Oct - 24 Oct	Frontier Airlines
17 Oct - 24 Oct	Volaris	direct
13 Oct - 20 Oct	Volaris	direct

Also check the deals for one-way 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 return flights from Seattle to Guadalajara in October from 308€

Return flights