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Cheap Flights from Washington D.C. (IAD) to Denver (DEN)

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Compare Washington Dulles to Denver International flight deals

Find the cheapest month or even day of the year to fly to Denver International

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Flight deals from Washington Dulles to Denver International

Looking for a cheap last-minute deal or the best return flight from Washington Dulles to Denver International? Find the lowest prices on one-way and return tickets right here.
Denver.$230 per passenger.Departing Sat, 7 Jun, returning Tue, 10 Jun.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Sat, 7 Jun, arriving in Denver International.Inbound direct flight with United departs from Denver International on Tue, 10 Jun, arriving in Washington Dulles.Price includes taxes and charges.From $230, select.
Denver.$230 per passenger.Departing Tue, 29 Jul, returning Tue, 5 Aug.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Tue, 29 Jul, arriving in Denver International.Inbound direct flight with United departs from Denver International on Tue, 5 Aug, arriving in Washington Dulles.Price includes taxes and charges.From $230, select.
Denver.$232 per passenger.Departing Tue, 14 Oct, returning Sat, 18 Oct.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Tue, 14 Oct, arriving in Denver International.Inbound direct flight with United departs from Denver International on Sat, 18 Oct, arriving in Washington Dulles.Price includes taxes and charges.From $232, select.
Denver.$232 per passenger.Departing Tue, 1 Jul, returning Tue, 29 Jul.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Tue, 1 Jul, arriving in Denver International.Inbound direct flight with United departs from Denver International on Tue, 29 Jul, arriving in Washington Dulles.Price includes taxes and charges.From $232, select.
Denver.$232 per passenger.Departing Sat, 28 Jun, returning Wed, 2 Jul.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Sat, 28 Jun, arriving in Denver International.Inbound direct flight with United departs from Denver International on Wed, 2 Jul, arriving in Washington Dulles.Price includes taxes and charges.From $232, select.
Denver.$263 per passenger.Departing Mon, 11 Aug, returning Wed, 13 Aug.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Mon, 11 Aug, arriving in Denver International.Inbound direct flight with United departs from Denver International on Wed, 13 Aug, arriving in Washington Dulles.Price includes taxes and charges.From $263, select.
Denver.$292 per passenger.Departing Fri, 30 May, returning Fri, 6 Jun.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Fri, 30 May, arriving in Denver International.Inbound direct flight with United departs from Denver International on Fri, 6 Jun, arriving in Washington Dulles.Price includes taxes and charges.From $292, select.
Denver.$294 per passenger.Departing Thu, 30 Oct, returning Sun, 2 Nov.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Thu, 30 Oct, arriving in Denver International.Inbound direct flight with United departs from Denver International on Sun, 2 Nov, arriving in Washington Dulles.Price includes taxes and charges.From $294, select.

Find the cheapest month to fly from Washington Dulles to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to Denver International flights are currently cheapest in June.
May
from $314
Jun
from $230
Jul
from $232
Aug
from $263
Sep
from $374
Oct
from $232
Nov
from $419
Dec
from $419
Jan
from $824
Feb
from $419
Mar
Find prices
Apr
Find prices

Direct flights from Washington Dulles to Denver International

Washington Dulles to Denver International: Alternative routes

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

Washington D.C. to Denver: Flight information

The things to know before you go.
Cheapest flight found$230
Cheapest month to flyJuly
Average flight time3 hrs, 55 mins
Most popular airlineUnited
Average flights per week191

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

The best price we found for a return flight from Washington Dulles to Denver International is $230. 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 55 minutes is the average flight time from Washington Dulles to Denver International.
United, Southwest Airlines and Copa fly direct from Washington Dulles to Denver International.
As of May 2025, there are 191 flights per week flying from Washington Dulles to Denver International.
The cheapest month to fly from Washington Dulles to Denver International is usually May 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Denver International Airport on Tuesday, 29 July 2025.
Yes – the average flight time is 3 hours and 55 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 Denver International 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.
Currently, United offers the cheapest flight tickets to Denver International.

Travelling from Washington Dulles International Airport (IAD) to Denver International Airport (DEN): what you need to know

  • Hop on a direct flight from Washington Dulles International Airport to Denver International Airport and you'll be in the air for an average of 3 hours 55 minutes.

  • Denver's timezone is UTC-6, which makes Denver two hours behind Washington DC.

  • Every week, there are 154 Washington Dulles International Airport to Denver International Airport flights. To jet off early, select the 05:00 Southwest Airlines flight. If you're eager to make the most of your time before you fly, the latest flight is at 22:12 with United Airlines.

  • To ensure you catch your IAD to DEN flight, leave enough time to check in and find your gate. Arriving two hours before international departures and one hour before domestic flights is the standard rule.

  • You can expect longer lines during popular months like April. Arriving up to four hours ahead of an international flight and two hours for a domestic departure is a smart move.

  • United Airlines has direct flights from Washington Dulles International Airport to Denver International Airport. Book with this popular airline, then get ready to see the sights in Denver — and maybe even more of United States if time allows.

  • United Airlines has the highest passenger demand on this route.

  • With a reliable 87.05% of services arriving on schedule, Southwest Airlines is the most punctual carrier for IAD to DEN flights.

  • If you want to include a stop along the way, simply deselect 'Direct flights only' when searching for your ticket from Washington Dulles International Airport to Denver International Airport. Here are the top stopovers between IAD and DEN:

    • Lambert-St. Louis International Airport

    • Pittsburgh International Airport

    • Indianapolis International Airport

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

  • The cheapest price we've seen for a one-way Washington Dulles International Airport to Denver International Airport flight is $116. A return ticket right now is $230. Depending on the availability when you book, these fares can change.

  • To secure cheap tickets from IAD to DEN, reserve your journey six months before your departure date.

  • May is the cheapest month for flights from Washington Dulles International Airport to Denver International Airport. If you'd like to fly at a different time of year, the 'Whole month' tool will show you the lowest prices across every month.

  • Save time looking for cheap flights from IAD to DEN by creating a Price Alert. You'll receive an email or notification on the app when fares go down.

  • Find the right flight for you with the help of the filters. To see the 'Best,' 'Fastest' or 'Cheapest' flights from Washington Dulles International Airport to Denver International Airport, use the 'Sort by' tool. You can also filter by airline, arrival and departure times, and journey duration.

Handy information about Washington Dulles International Airport (IAD)

  • IAD's address is 1 Saarinen Circle.

  • When it comes to the on-time performance of Washington Dulles International Airport, data shows 74.39% of flights meet their scheduled arrival time.

  • Washington Dulles International Airport is about 56 kilometres from central Washington DC. If you're driving, catching a cab or ride-sharing from the centre, it'll take 50 minutes or so to get there, depending on the traffic.

  • The journey on public transport takes about 3 hours 25 minutes.

  • Searching for a handy hotel near IAD? If you're boarding an early flight from Washington Dulles International Airport to Denver International Airport, these accommodation options will have you sleeping moments from check-in:

Arriving at Denver International Airport (DEN)

  • Consider checking in to Baymont by Wyndham Denver International Airport after your Washington Dulles International Airport to Denver International Airport flight. It's a quick drive from DEN and a good choice if you're eager to catch some z's soon after landing.

  • Follow your own route with a Denver International Airport rental car. Book your wheels from Routes Car Rentals, Dollar or Budget and venture far and wide through Denver and beyond.

  • Lock in the lowest price by booking your ride from Denver International Airport around one week ahead of your trip.

Getting from Denver International Airport (DEN) to central Denver

  • The street address for DEN is 8500 Pena Boulevard.

  • Denver International Airport to the centre of Denver has a drive time of about 35 minutes. It's approximately 40 kilometres away.

  • Travelling to the centre on public transport typically takes 1 hour 30 minutes.

When to fly to Denver International Airport (DEN)

  • July is the busiest month for flights from Washington Dulles International Airport to Denver International Airport. To avoid the crowds, visit Denver in April.

  • The warmest month in Denver is July, with the temperature ranging between 14ºC (57ºF) and 32ºC (90ºF). Book your flights from Washington Dulles International Airport to Denver International Airport in this month if you like this kind of weather.

  • If you like cooler conditions, look for a cheap ticket from IAD to DEN in January. Temperatures average between -9ºC (16ºF) and 7ºC (45ºF) then.

Explore more of United States

  • Colorado Springs is just one of the many places in United States waiting to be discovered once you've taken in the sights of Denver. Around 105 kilometres away to the south, its best attractions include US Northern Command (USNORTHCOM) / North American Aerospace Defence Command (NORAD) Headquarters, Cheyenne Mountain Air Force Station and National Strength and Conditioning Association (NSCA).

  • If you're ready to explore another major destination in United States, head for Aurora, about 13 kilometres east of Denver. Magellan's Travel Solutions and Gear, The Fairways at Lowry and Retired Enlisted Association Inc are key highlights.

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

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