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Cheap Flights from Denver to Washington Dulles

Compare Denver to Washington Dulles flight deals

Find the cheapest month or even day of the year to fly to Washington Dulles

Book the best Washington Dulles fare with no extra fees

Flight deals from Denver to Washington Dulles

Looking for a cheap last-minute deal or the best return flight from Denver to Washington Dulles? Find the lowest prices on one-way and return tickets right here.
Washington D.C..R 1,105 per passenger.Departing Mon, 12 Jan.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Mon, 12 Jan, arriving in Washington Dulles.Price includes taxes and charges.From R 1,105, select.
Washington D.C..R 1,110 per passenger.Departing Tue, 16 Dec.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Tue, 16 Dec, arriving in Washington Dulles.Price includes taxes and charges.From R 1,110, select.
Washington D.C..R 1,140 per passenger.Departing Fri, 6 Feb.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Fri, 6 Feb, arriving in Washington Dulles.Price includes taxes and charges.From R 1,140, select.
Washington D.C..R 1,528 per passenger.Departing Sat, 17 Jan.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Denver International on Sat, 17 Jan, arriving in Washington Dulles.Price includes taxes and charges.From R 1,528, select.
Washington D.C..R 1,534 per passenger.Departing Sat, 7 Feb.One-way flight with United.Outbound direct flight with United departs from Denver International on Sat, 7 Feb, arriving in Washington Dulles.Price includes taxes and charges.From R 1,534, select.
Washington D.C..R 1,583 per passenger.Departing Wed, 11 Mar.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Wed, 11 Mar, arriving in Washington Dulles.Price includes taxes and charges.From R 1,583, select.
Washington D.C..R 1,884 per passenger.Departing Tue, 16 Dec.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Denver International on Tue, 16 Dec, arriving in Washington Dulles.Price includes taxes and charges.From R 1,884, select.
Washington D.C..R 2,979 per passenger.Departing Fri, 28 Nov.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Fri, 28 Nov, arriving in Washington Dulles.Price includes taxes and charges.From R 2,979, select.

Find the cheapest month to fly from Denver to Washington Dulles

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Denver to Washington Dulles flights are currently cheapest in January.
Nov
from R 2,979
Dec
from R 1,110
Jan
from R 1,105
Feb
from R 1,140
Mar
from R 1,583
Apr
from R 3,099
May
from R 3,279
Jun
from R 3,117
Jul
from R 3,285
Aug
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Sep
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Oct
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Direct flights from Denver to Washington Dulles

Denver to Washington Dulles: Alternative routes

Compare routes from Denver to Washington D.C. below. You may find an airport to fly into that's cheaper, faster, or easier than Washington Dulles.

Denver to Washington D.C.: Flight information

The things to know before you go.
Cheapest flight foundR 1,105
Cheapest month to flyJanuary
Average flight time3 hrs, 21 mins
Most popular airlineUnited
Average flights per week346

Finding cheap flights from Denver to Washington Dulles: Frequently asked questions

The best price we found for a return flight from Denver to Washington Dulles is R 2,282. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
3 hours and 21 minutes is the average flight time from Denver to Washington Dulles.
United, Southwest Airlines and Copa fly direct from Denver to Washington Dulles.
As of November 2025, there are 173 flights per week flying from Denver to Washington Dulles.
The cheapest month to fly from Denver to Washington Dulles is usually January.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Denver to Washington Dulles Airport on Friday, 23 January 2026.
Yes – the average flight time is 3 hours and 21 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Washington Dulles but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Washington D.C. is around 40 days in advance, so don’t leave your flight to the last minute.

Flying from Denver to Washington Dulles International Airport (IAD): What you need to know

  • Your boarding pass to adventure starts at Denver's main airport, Denver International Airport (DEN). Explore your options for reserving a flight from Denver to Washington Dulles International Airport (IAD) departing from this base.

  • Take off on a direct Denver to Washington Dulles International Airport flight and you'll be travelling for around 3 hours 20 minutes.

  • Washington DC is two hours ahead of Denver. Washington Dulles International Airport is located in Washington DC, which runs on the UTC-4 timezone.

  • Denver International Airport (DEN) to Washington Dulles International Airport (IAD) is the most popular route. There are 62 direct weekly flights to pick from. If you prefer a later start to the day, hop on the last flight with United Airlines at 11:59pm. Go for the first DEN to IAD departure operated by United Airlines at 6am if you're aiming for an earlier start.

  • Your flight from Denver to IAD won't wait if you're late, so be at the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're travelling internationally.

  • Longer lines at security and check-in are likely if you're flying during high season, so allow a little extra breathing room. The recommendation for peak times? Get there up to four hours early for international flights and at least two hours for domestic departures.

Airports in Denver

Denver International Airport (DEN)

  • You can jump on a direct flight from Denver to Washington Dulles International Airport (IAD) departing from Denver International Airport (DEN).

  • You can lock in a direct flight from Denver to Washington Dulles International Airport with United Airlines. This top carrier operates departures from DEN.

  • United Airlines sees the most traveller bookings for flights from DEN to IAD.

  • United Airlines is the leading carrier for punctuality on this route.

  • DEN is around 40 kilometres from central Denver. If you're ride-sharing, driving or catching a cab from the centre, it'll take 35 minutes or so to get there, depending on traffic conditions. If you're using public transport, expect the trip time to be around 1 hour 30 minutes.

  • Spending the night in a hotel can take the stress out of getting to the airport on time. If you're searching for somewhere to stay before your flight from Denver to Washington Dulles International Airport, check out Baymont by Wyndham Denver International Airport. It's a quick drive from Denver International Airport.

  • Denver International Airport scores high marks for on-time performance. 80.23% of flights that take off from DEN reach their destination without delay.

  • DEN is located at 8500 Pena Boulevard.

About Washington Dulles International Airport (IAD)

Getting from Washington Dulles International Airport (IAD) to central Washington DC

  • Central Washington DC is roughly 40 kilometres from Washington Dulles International Airport. Journey times by cab or car hire will vary based on traffic conditions, so do a little research before you go.

  • Travelling by public transport will take you roughly 1 hour 10 minutes.

How to find the cheapest flights from Denver to Washington Dulles International Airport (IAD)

  • Right now, R 1,105 is the lowest price we've found for a one-way ticket from Denver to Washington Dulles International Airport. The cheapest price for a return flight is R 2,282. Remember fares can change due to availability at the time of booking.

  • Score cheap flights from Denver to IAD by booking 11 months ahead. Based on our research, that's the ideal time frame for finding the biggest deals.

  • Plan your trip for April. That's the best month for landing a great bargain on Denver to Washington Dulles International Airport tickets. If you have flexibility with your dates, use the 'Whole month' tool to find the lowest price across every month.

  • There's no need to check back in every day to find out if fares have dropped when you set up a Price Alert. We'll let you know the moment a better deal is available on plane tickets from Denver to IAD.

  • Bag the best deal on a flight from Denver to Washington Dulles International Airport with the help of the filters. Pick your ideal departure and arrival times, airlines and number of stops. You can also sort your results by 'Fastest,' 'Cheapest' or 'Best.'

The best time to fly from Denver to Washington Dulles International Airport (IAD)

  • Picture the kind of break you want when planning your trip dates. February is the quietest month to visit Washington DC. July is when most people book flights from Denver to Washington Dulles International Airport (IAD), which may be perfect if you enjoy travelling when it's busier.

  • Book a Denver to IAD plane ticket departing in July if you're eager to experience the city during its warmest month. You can expect temperatures in Washington DC to range from 19ºC (66ºF) to 33ºC (91ºF).

  • Look for cheap tickets from Denver to Washington Dulles International Airport in January if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between -6ºC (21ºF) and 10ºC (50ºF).

More about Washington DC

Explore more of the United States

  • Philadelphia is just one of the many cities in the United States waiting to be explored once you've seen the sights of Washington DC. Around 225 kilometres away to the north-east, well-known attractions include Independence Hall, Liberty Bell and Philadelphia Museum of Art.

  • Around 274 kilometres south-east of Washington DC, Virginia Beach is another favourite stop in the United States. Experience this destination's highlights firsthand at Virginia Beach Oceanfront, Virginia Beach Boardwalk and Resort Beach.

Plan the rest of your trip from Denver to Washington D.C.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.