$80 Cheap United flights Las Vegas (LAS) to Washington (IAD)

Landing cheap one-way United Airlines flights from LAS to IAD from $80 on Expedia couldn’t be easier — just filter by “Price (lowest to highest).” Or check out our budget-friendly return fares from $154 for your next getaway.**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.

Search for one-way or return flights to Washington in January or February. You could find lower fares with United Airlines during these off-season months.

For cheap United Airlines fares from Harry Reid Intl. Airport (LAS) to Washington Dulles Intl. Airport (IAD), 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 affect the cost. 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 flight 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.

Easily travel from Harry Reid Intl. Airport (LAS) to Washington Dulles Intl. Airport (IAD) on one of United Airlines’s 21 weekly direct flights. Use our “Nonstop” and “Airline” filters to find the United Airlines flight that’ll take you to IAD at a time that suits you.

Leave Harry Reid Intl. Airport (LAS) for Washington Dulles Intl. Airport (IAD) on a direct United Airlines flight, and you’ll be in the sky for around 4h 27m.

If you’re looking for flexibility, Monday offers the most choice for United Airlines flights from Harry Reid Intl. Airport (LAS) to Washington Dulles Intl. Airport (IAD). Take your pick of 3 different departures.

Leaving LAS at 8:40AM UTC-8, the earliest United Airlines flight to IAD lands at 4:07PM UTC-5. Flying early means you’ll be less likely to experience cancellations.* Prefer to travel later? The last United Airlines flight from LAS to IAD departs at 11:30PM UTC-8 and touches down at 6:57AM UTC-5.*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.

Washington Dulles Intl. Airport (IAD) is the main Washington gateway for United Airlines flights from Harry Reid Intl. Airport (LAS). Baltimore Washington Intl. Thurgood Marshall Airport (BWI) and Ronald Reagan Washington National Airport (DCA) are other options. When planning your break with Expedia, select the “All Airports” option for your destination to see exactly what’s available.

Fly from LAS to IAD with United Airlines and you can look forward to a host of benefits starting with a rewarding loyalty program. When you book through Expedia as a United Mileage Plus and One Key™ member, you may also earn OneKeyCash™* to redeem on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

For the Harry Reid Intl. Airport (LAS) to Washington Dulles Intl. Airport (IAD) route, United Airlines typically uses Boeing 737-800 and Boeing 737 MAX 9 planes. Remember that last-minute changes are possible for operational demands, meaning your flight could be on another aircraft.

Changes are generally free within 24 hours of making a booking, but your airline may charge you after that. For more information about modifying your flights, check out your “Trips,” select your flight and click on “Manage Booking.” If you’d like the freedom to change your itinerary without additional charges, tick the “Changes included” or “No cancel fee” filter when organizing your next trip.