$69 Cheap Southwest Airlines flights Las Vegas (LAS) to Denver (DEN)

You'll find affordable round-trip Southwest Airlines flights from $137 from LAS to DEN by organizing your results from "Price (lowest to highest)" on Expedia. Or search for options from $69 for a one-way trip.**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.

For cheap Southwest Airlines fares from Harry Reid Intl. Airport (LAS) to Denver Intl. Airport (DEN), start searching one to three months before your intended departure. Reserving 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 impact 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 booking your trip 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.

Departing LAS at 5:30AM UTC-8, the first Southwest Airlines flight to DEN lands at 8:15AM UTC-7. Traveling early means you're less likely to experience delays.* Prefer a later start? The last Southwest Airlines flight from LAS to DEN departs at 9:50PM UTC-8 and touches down at 12:40AM UTC-7.*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.