Searching for airfare from Denver to Las Vegas sounds simple until you open a flight comparison site and realize prices vary by $80 or more depending on the day, the airline, and how far out you’re looking. That gap isn’t random; it follows patterns that most travelers never bother to learn.
Denver to Las Vegas is a popular leisure route. It’s short (around two hours), served by multiple airlines, and in demand year-round because Las Vegas never really has an off-season. That competition between carriers can work in your favor if you know where to look and when.
This guide covers the practical side of finding lower fares on this route: which airlines to compare, when prices tend to drop, what hidden costs inflate a “cheap” ticket, and how to avoid the common mistakes that cost travelers money before they even land in Vegas.
Which Airlines Fly from Denver to Las Vegas?
Four main carriers dominate this route, and each operates differently.
Southwest Airlines doesn’t show up on Google Flights or Abordia, so many travelers miss their fares entirely. You have to check southwest.com directly. They allow two free checked bags and no change fees, which adds real value compared to ultra-low-cost carriers.
Frontier Airlines is based in Denver and frequently runs sale fares on this route. Their base fares can look very attractive, but seat selection, carry-on bags, and checked luggage all cost extra. A $49 fare can easily become $110 once you add a carry-on.
Spirit Airlines follows a similar model. If you’re traveling with just a personal item that fits under the seat, Spirit can genuinely be the cheapest option. Otherwise, the add-ons stack up fast.
United Airlines offers more traditional pricing with included carry-ons. Their fares on this route are typically higher than Frontier or Spirit but often lower than you’d expect once you account for what’s included.
When comparing flight tickets from Denver to Las Vegas, don’t just look at the base price. Add up what you’ll actually pay for bags and seats before deciding.
When to Search for Lower Fares
Book 3 to 6 Weeks Out
This is the consistent sweet spot for the Denver–Las Vegas route. Booking too far in advance (more than 3 months) often means paying higher initial fares before airlines have released discounted inventory. Waiting until the last two weeks is risky on a leisure route this popular — prices climb as seats fill.
For more on timing your purchase, see: Best Time to Buy Plane Tickets
Fly Mid-Week to Save
Demand spikes on Friday afternoons and Sunday evenings — the classic Vegas weekend trip windows. Airlines price those flights accordingly. Shifting your departure to Thursday evening or your return to Monday morning can save $40–$80 per ticket on the same airline.
Tuesday and Wednesday departures tend to be the cheapest days to fly on this route. Even a one-day shift in your travel plans sometimes makes a meaningful difference.
Travel in the Off-Peak Months
Las Vegas never fully empties, but there are quieter stretches. January and February (after New Year’s) see reduced demand and lower fares. September and October are also good summer heat fades, major conventions wrap up, and prices soften before the holiday surge.
Avoid the following windows if fare matters to you: CES week (early January), spring break (mid-March through early April), Memorial Day, Fourth of July, Labor Day, and New Year’s Eve. These are the most expensive times to book cheap flights from Denver to Las Vegas.
For a detailed look at how seasonal timing affects this specific route, see: Best Time to Book Denver to Las Vegas Flights
Tools That Actually Help
Google Flights
The calendar and price graph views in Google Flights are genuinely useful. Switch to the date grid view to see an entire month of fares at once, spotting the cheapest travel days without manually checking each one. The price alert feature sends you an email when fares drop for your specific route and dates.
One important note: Google Flights does not include Southwest fares. Always cross-check at southwest.com after running your Google Flights search.
Hopper
Hopper analyzes historical fare data and tells you whether to buy now or wait, with a prediction of where prices are likely to go. It’s not perfect, but it’s a useful second opinion when you’re unsure whether a current fare is genuinely good or just average.
Incognito Mode
There’s a persistent debate about whether flight sites track your searches and raise prices. To avoid any risk, run your searches in a private or incognito browser window. It takes five seconds and removes any question.
The Baggage Fee Problem
This is where a lot of travelers get caught off guard. You find a $55 fare on Frontier, book it, then add a carry-on at the airport for $65. The flight that looked cheap ended up costing more than the United fare you passed on.
Before booking any ultra-low-cost carrier fare, open a new tab and look up their current baggage fee schedule. Frontier and Spirit both publish these on their websites. Then add those fees to the base fare and compare that total to what Southwest or United is actually charging.
For a deeper look at when cheap tickets aren’t actually the best deal, read: Why Cheap Flights Aren’t Always Best to Buy
Airport Tips for This Route
Denver International Airport (DEN) is large. The main terminal (Jeppesen Terminal) connects to the concourses via an underground train. If you’re checking bags, arrive 90 minutes before departure. Security lines at DEN can move slowly during morning peaks (6–9 a.m.) and afternoon waves (3–6 p.m.).
Harry Reid International Airport (LAS) is about 5 miles from the Strip. Rideshares take 10–20 minutes, depending on traffic. The airport has slot machines in the terminal; skip them and head straight to baggage claim to avoid the crowds near the exits.
Frequently Asked Questions
Compare fares across all airlines on this route, including Southwest (which doesn’t appear on most comparison sites). Book 3–6 weeks in advance, fly mid-week, and travel in January, February, September, or October.
It depends on what you’re bringing. Frontier and Spirit often have the lowest base fares, but they charge for carry-ons and seat selection. Southwest’s base fares are sometimes higher but include two free checked bags and no change fees. For travelers with just a small personal item, Spirit or Frontier can genuinely be the cheapest. For travelers with luggage, Southwest or United often wins on total cost.
Occasionally, but rarely. The Denver–Las Vegas route is only about two hours nonstop. A connecting flight might save $30–$60 but could add 3–5 hours of travel time, plus the risk of a missed connection.
Yes. Frontier, Spirit, and Southwest all run periodic fare sales. Frontier and Spirit tend to advertise these via email and on their websites. Southwest’s “Wanna Get Away” fares are their discounted tier and are worth checking regularly. Signing up for airline email lists or fare alert tools like Abordia is the easiest way to catch these before they sell out.
January and February (after the New Year’s rush) tend to have the lowest average fares. September and early October are also competitive. These months combine lower demand with no major Las Vegas events or holidays, driving prices up.
