$84 Cheap Frontier Airlines flights Washington (IAD) to Las Vegas (LAS)

Make use of the “Price (lowest to highest)” filter on Expedia to find cheap Frontier Airlines round-trip flights from $163 from IAD to LAS. Affordable one-way options from $84 are also on offer.**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.

Frontier Airlines flights to Las Vegas are typically more affordable in the off-peak months of January and June. Whether you’re after a one-way or round-trip ticket, you could land a better deal then.

To find cheap Frontier Airlines fares from Washington Dulles Intl. Airport (IAD) to Harry Reid Intl. Airport (LAS), start searching one to three months before your planned 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 influence the cost. Sunday is typically the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking 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.

To figure out if there’s a direct trip from IAD to LAS with Frontier Airlines or other airlines, check the “Nonstop” box when browsing for tickets.

Browse Frontier Airlines’s earliest flights from IAD to LAS by checking our “Morning” and “Early Morning” filters. Not only will you get to your destination sooner, early departures are also 20% less likely to be canceled.**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.

Harry Reid Intl. Airport (LAS) is the primary Las Vegas hub for Frontier Airlines flights from Washington Dulles Intl. Airport (IAD).

With a rewarding loyalty program, Frontier Airlines is a top pick for many travelers journeying from IAD to LAS. Plus, as a Frontier Miles and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights on top of your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the ticket type you purchased, a fee may apply if you cancel or change your flight more than 24 hours after it’s been confirmed. To secure plane tickets with more flexibility, select our “No cancel fee” or “Changes included” filter when looking for flights. For more details on changing or canceling your reservation, go to “Trips,” select your flight and click on “Manage Booking.”