AirHint found the following cheapest return flights from Seattle (SEA) to Las Vegas (LAS) in December 2025 (see full year).

Return flights

06 Dec - 10 Dec	Delta	direct
10 Dec - 15 Dec	Delta	direct
13 Dec - 20 Dec	Alaska Airlines	direct
14 Dec - 20 Dec	Alaska Airlines	direct
05 Dec - 09 Dec	Delta	direct
01 Dec - 06 Dec	Delta	direct
17 Dec - 21 Dec	Delta	direct
15 Dec - 22 Dec	Delta	direct
20 Dec - 25 Dec	Delta	direct
31 Dec - 03 Jan	Alaska Airlines	direct
27 Dec - 29 Dec	Alaska Airlines	direct
19 Dec - 03 Jan	Alaska Airlines	direct

Also check the deals for one-way flights from Seattle to Las Vegas in December.

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 Las Vegas in December from 127€

Return flights