$79 Cheap Southwest Airlines flights Seattle (SEA) to Las Vegas (LAS)

Set the "Price (lowest to highest)" filter on Expedia to look for cheap Southwest Airlines round-trip flights from $152 from SEA to LAS. Affordable one-way tickets from $79 are available as well.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

To find cheap Southwest Airlines fares from Seattle - Tacoma Intl. Airport (SEA) to Harry Reid Intl. Airport (LAS), start searching one to three months before your intended departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also influence the price you pay. Sunday is usually the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by choosing to book on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

The earliest Southwest Airlines flight from SEA to LAS takes off at 6:50AM UTC-8, landing at 9:15AM UTC-8. If you'd like to head off later, the last Southwest Airlines flight leaves SEA at 2:40PM UTC-8 and lands at LAS at 5:10PM UTC-8. Flying early is often a wise choice as morning flights tend to experience fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.