IAD to LAS from $179 in economy

UAUnited Airlines

Round Trip•Economy

IAD

Washington Dulles International Airport

Washington, United States

LAS

Harry Reid International Airport

Las Vegas, United States

$390 USD

-54%$179 USD

Verified about 11 hours ago

December 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30$390 1$237 2$237 3$316 4$321 5$263 6$321 7$263 8$237 9$237 10$263 11$321 12$332 13$390 14$332 15$306 16$306 17$445 18$487 19$416 20$421 21$445 22$416 23$427 24$445 25$487 26$502 27$445 28$445 29$487 30$375 31$416 1$416 2$375 3$445

Extremely Rare Availability

4% of dates checked are available within 10% of the lowest price

Sunday, December 20th, 2026

9 round-trip options

Returning

Fri, Dec 25, 2026•5 Day Trip

$492 USD

Google Flights

Returning

Sun, Dec 27, 2026•7 Day Trip

$486 USD

Google Flights

Returning

Mon, Dec 28, 2026•8 Day Trip

$486 USD

Google Flights

Returning

Tue, Dec 29, 2026•9 Day Trip

$421 USD

Google Flights

Returning

Wed, Dec 30, 2026•10 Day Trip

$445 USD

Google Flights

Returning

Thu, Dec 31, 2026•11 Day Trip

$515 USD

Google Flights

Returning

Fri, Jan 1, 2027•12 Day Trip

$515 USD

Google Flights

Returning

Sat, Jan 2, 2027•13 Day Trip

$667 USD

Google Flights

Returning

Sun, Jan 3, 2027•14 Day Trip

$491 USD

Google Flights

Washington (IAD) to Las Vegas (LAS) flight deal in economy from $179

Washington Dulles International Airport

Harry Reid International Airport

December 2026

Sunday, December 20th, 2026