$108 Cheap United flights Washington (IAD) to Las Vegas (LAS)

Use the “Price (lowest to highest)” filter on Expedia to look for cheap United Airlines return flights from $215 from IAD to LAS. Affordable one-way fares from $108 are available too.**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.

United Airlines flights to Las Vegas are usually more affordable in the quieter months of January and June. Whether you’re searching for a return or one-way ticket, you could land a better deal then.

Begin your search one to three months ahead of your departure date to get cheaper fares on United Airlines flights from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, and you can enjoy significant savings on domestic journeys.*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.

Jet off on one of United Airlines’s 21 weekly direct flights from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS). To see your choices, enter your travel dates, origin and destination and hit search. Next, apply the “Nonstop” and “Airline” filters.

Take off from Washington Dulles Intl. Airport (IAD) for Harry Reid Intl. Airport (LAS) on a direct United Airlines flight, and you’ll be airborne for about 5h 23m.

If it’s flexibility you’re after, Thursday offers the most choice for United Airlines flights from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS). You can select from 3 different departures.

The earliest flight from IAD to LAS with United Airlines leaves at 9:00AM UTC-5. You’ll land at 11:23AM UTC-8. The final United Airlines flight of the day takes off at 7:02PM UTC-5 and arrives at 9:25PM UTC-8. With 20% fewer cancellations for morning and mid-morning departures, beginning your travel day early is typically the best option.**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.

Catch a United Airlines flight from Washington Dulles Intl. Airport (IAD) to Las Vegas, and you’ll probably come in to Harry Reid Intl. Airport (LAS). This is the airline’s main hub in this city.

A rewarding loyalty program and the chance to rack up points through United Mileage Plus are the start of the reasons to jet off from IAD to LAS with United Airlines. Plus, when you sign up to our One Key™ program, you can earn OneKeyCash™* in addition to United Airlines’s loyalty program earnings. It’s yours to spend on your next adventure.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

For the Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS) route, United Airlines typically uses Boeing 737-800 and Boeing 737-900 planes. Keep in mind that last-minute changes are possible for operational reasons, meaning your flight may be on a different aircraft.

Depending on your fare type, a fee typically applies if you cancel or reschedule your booking more than 24 hours after it’s confirmed. To find tickets with more flexibility, select our “Changes included” or “No cancel fee” filter when searching for flights. For more information on changing or canceling your reservation, go to “Trips,” select your flight and tick “Manage Booking.”