Denver (DEN) to Washington (IAD) flight deal from $177 USD in economy class

UAUnited Airlines

Round Trip•Economy

DEN

Denver International Airport

Denver, United States

IAD

Washington Dulles International Airport

Washington, United States

$367 USD

-52%$177 USD

Verified Nov 4, 2025 at 6:22 AM

December 2025

Today

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1$325 2$260 3$197 4$197 5$197 6$177 7$197 8$197 9$177 10$177 11$197 12$197 13$260 14$273 15$273 16$273 17$270 18$362 19$395 20$393 21$395 22$358 23$278 24$243 25$243 26$322 27$286 28$322 29$286 30$265 31$245 1 2 3 4

Extremely Rare Availability

3% of dates checked are available within 10% of the lowest price

Sunday, December 21st, 2025

10 round-trip options

Returning

Fri, Dec 26, 2025•5 Day Trip

$604 USD

Google Flights

Returning

Sat, Dec 27, 2025•6 Day Trip

$658 USD

Google Flights

Returning

Sun, Dec 28, 2025•7 Day Trip

$604 USD

Google Flights

Returning

Mon, Dec 29, 2025•8 Day Trip

$496 USD

Google Flights

Returning

Tue, Dec 30, 2025•9 Day Trip

$414 USD

Google Flights

Returning

Wed, Dec 31, 2025•10 Day Trip

$395 USD

Google Flights

Returning

Thu, Jan 1, 2026•11 Day Trip

$420 USD

Google Flights

Returning

Fri, Jan 2, 2026•12 Day Trip

$458 USD

Google Flights

Returning

Sat, Jan 3, 2026•13 Day Trip

$458 USD

Google Flights

Returning

Sun, Jan 4, 2026•14 Day Trip

$411 USD

Google Flights