AirHint found the following cheapest one-way flights from Seattle (SEA) to Las Vegas (LAS) in September 2025 (see full year).

One-Way flights

14 Sep	Frontier Airlines	direct
22 Sep	Frontier Airlines	direct
29 Sep	Frontier Airlines	direct
25 Sep	Frontier Airlines	direct
08 Sep	Frontier Airlines	direct
15 Sep	Frontier Airlines	direct
19 Sep	Frontier Airlines
12 Sep	Frontier Airlines
03 Sep	Frontier Airlines
27 Sep	Southwest Airlines	direct

Also check the deals for return flights from Seattle to Las Vegas in September.

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 Las Vegas in September from 34€

One-Way flights