$80 Cheap Flights from Washington (IAD) to Las Vegas (LAS)

View $80 flight on Sat, Aug 16, 2025Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS)

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Cheap Flights from Washington to Las Vegas (IAD-LAS)

Prices were available within the past 7 days and start at $80 for one-way flights and $145 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, Jul 29 - Tue, Aug 5
IAD
Washington
LAS
Las Vegas
$145 Roundtrip, found 8 hours ago
$145
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Tue, Jul 29 from Washington to Las Vegas, returning Tue, Aug 5, priced at $145 found 8 hours ago
Frontier Airlines
Sat, Jul 19 - Wed, Jul 23
IAD
Washington
LAS
Las Vegas
$148 Roundtrip, found 5 hours ago
$148
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sat, Jul 19 from Washington to Las Vegas, returning Wed, Jul 23, priced at $148 found 5 hours ago
Frontier Airlines
Tue, Aug 19 - Wed, Aug 27
IAD
Washington
LAS
Las Vegas
$151 Roundtrip, found 10 hours ago
$151
Roundtrip
found 10 hours ago
Select Frontier Airlines flight, departing Tue, Aug 19 from Washington to Las Vegas, returning Wed, Aug 27, priced at $151 found 10 hours ago
United
Sat, Aug 16 - Wed, Aug 20
IAD
Washington
LAS
Las Vegas
$159 Roundtrip, just found
$159
Roundtrip
just found
Select United flight, departing Sat, Aug 16 from Washington to Las Vegas, returning Wed, Aug 20, priced at $159 just found
Frontier Airlines
Tue, Jul 15 - Sat, Jul 19
IAD
Washington
LAS
Las Vegas
$162 Roundtrip, found 4 hours ago
$162
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Tue, Jul 15 from Washington to Las Vegas, returning Sat, Jul 19, priced at $162 found 4 hours ago
United
Mon, Jul 28 - Thu, Aug 7
IAD
Washington
LAS
Las Vegas
$169 Roundtrip, found 6 hours ago
$169
Roundtrip
found 6 hours ago
Select United flight, departing Mon, Jul 28 from Washington to Las Vegas, returning Thu, Aug 7, priced at $169 found 6 hours ago
Frontier Airlines
Tue, Aug 12 - Thu, Aug 21
IAD
Washington
LAS
Las Vegas
$175 Roundtrip, found 8 hours ago
$175
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Tue, Aug 12 from Washington to Las Vegas, returning Thu, Aug 21, priced at $175 found 8 hours ago
Alaska Airlines
Tue, Aug 12 - Wed, Aug 13
IAD
Washington
LAS
Las Vegas
$218 Roundtrip, found 2 hours ago
$218
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Tue, Aug 12 from Washington to Las Vegas, returning Wed, Aug 13, priced at $218 found 2 hours ago
Delta
Tue, Sep 30 - Wed, Oct 1
IAD
Washington
LAS
Las Vegas
$251 Roundtrip, found 2 hours ago
$251
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, Sep 30 from Washington to Las Vegas, returning Wed, Oct 1, priced at $251 found 2 hours ago
Southwest Airlines
Sat, Aug 16 - Wed, Aug 20
IAD
Washington
LAS
Las Vegas
$257 Roundtrip, just found
$257
Roundtrip
just found
Select Southwest Airlines flight, departing Sat, Aug 16 from Washington to Las Vegas, returning Wed, Aug 20, priced at $257 just found

Find the cheapest month to fly from Washington (IAD) to Las Vegas (LAS)

May is typically the cheapest month to fly

From $112 - $481 per traveler.

Graph displaying average flight prices per month

Flights from Washington (IAD) to Las Vegas (LAS)
Origin airport
Washington Dulles Intl.
Destination airport
Harry Reid Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$145
Distance
2060 mi
Average flight time
2 hours 2 mins

Washington to Las Vegas Flights

The cheapest times to fly from Washington to Las Vegas

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Las Vegas are during the month of July. You can find some of the cheapest flights from Washington to Las Vegas with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Las Vegas

Sunday is one of the best days to book for cheap flights from Washington to Las Vegas: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Las Vegas

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Las Vegas in 2025. You can also book with separate airlines for your outbound and return journeys, from $80 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Las Vegas flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Las Vegas airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS) cost?
Find cheap return flights from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS) starting at $151. Book your seat and get ready to go. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving IAD on July 28 2025 and touching down at LAS. The price was last updated on July 3 2025 and has not changed since.
What is the cheapest month to fly from IAD to LAS?
The cheapest flights from IAD to LAS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS)?
Board a nonstop flight with United Airlines and head straight from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS).
What is the cheapest airline that flies from IAD to LAS?
With prices starting from $80 for a one-way journey from IAD to LAS, United is currently the cheapest airline flying this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from IAD on September 28 2025. Prices were last updated on July 3 2025 and have not changed since.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS)?
When jetting out of Washington Dulles Intl. Airport (IAD), you'll have a choice from an average of 3 daily direct flights to Harry Reid Intl. Airport (LAS).
What are the most popular departure times for flights from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS)?
The 9 AM departures from IAD to LAS are the most sought after. These flights can come with a higher price due to their popularity. If you want to save money, book during off-peak hours.
What day of the week has the most flights from IAD to LAS?
Friday has the most flights from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS). Consider jetting off on this day and you'll have the best chance of finding a departure that works with your plans.
What is the earliest flight from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS)?
Catch the earliest flight at around 9:00AM UTC-5, heading out of Washington Dulles Intl. Airport (IAD). You'll be flying for roughly 5h 23m, touching down at Harry Reid Intl. Airport (LAS) at approximately 11:23AM UTC-8.
How long does it take to fly from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS)?
The average flight time from IAD to LAS is 5 hours and 23 minutes, covering a distance of 2,100 mi.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS)?
To avoid possible delays on the Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS) route, aim to fly before 3 PM. Later departures have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Las Vegas from Washington Dulles Intl. Airport (IAD)?
Harry Reid Intl. Airport (LAS) is the only airport in Las Vegas with direct flights from Washington Dulles Intl. Airport (IAD). Browse the available options and discover cheap fares on Expedia.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS) last-minute?
Holding off until just before your departure to book your flight from IAD to LAS often results in higher prices. Although you may find some last-minute deals, there's no guarantee. Be flexible with your itinerary to boost your chances of getting a bargain.
Is it cheaper to book an IAD to LAS flight and hotel package?
Opting for an IAD to LAS flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Choose from our impressive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS)?
You can usually reschedule or cancel your IAD to LAS flight. However, for bookings made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.