Skyscanner home

Cheap Flights from Washington Dulles to Denver

Your route at a glance

Cheapest dealR 2,155
Cheapest monthFebruary
Average flight duration4 hours and 5 minutes
Most popular airlineUnited

Compare Washington Dulles to Denver flight deals

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

Book the best Denver fare with no extra fees

Flight deals from Washington Dulles to Denver

Looking for a cheap last-minute deal or the best return flight from Washington Dulles to Denver? Find the lowest prices on one-way and return tickets right here.
Denver.R 1,087 per passenger.Departing Mon, 23 Feb.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Mon, 23 Feb, arriving in Denver International.Price includes taxes and charges.From R 1,087, select.
Denver.R 1,171 per passenger.Departing Mon, 2 Mar.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Mon, 2 Mar, arriving in Denver International.Price includes taxes and charges.From R 1,171, select.
Denver.R 1,342 per passenger.Departing Thu, 15 Jan.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Thu, 15 Jan, arriving in Denver International.Price includes taxes and charges.From R 1,342, select.
Denver.R 1,490 per passenger.Departing Wed, 4 Feb.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Dulles on Wed, 4 Feb, arriving in Denver International.Price includes taxes and charges.From R 1,490, select.
Denver.R 1,490 per passenger.Departing Sat, 24 Jan.One-way flight with United.Outbound direct flight with United departs from Washington Dulles on Sat, 24 Jan, arriving in Denver International.Price includes taxes and charges.From R 1,490, select.
Denver.R 1,502 per passenger.Departing Wed, 4 Mar.One-way flight with United.Outbound direct flight with United departs from Washington Dulles on Wed, 4 Mar, arriving in Denver International.Price includes taxes and charges.From R 1,502, select.
Denver.R 2,306 per passenger.Departing Wed, 31 Dec.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Wed, 31 Dec, arriving in Denver International.Price includes taxes and charges.From R 2,306, select.
Denver.R 2,530 per passenger.Departing Thu, 20 Aug.One-way flight with Sun Country Airlines.Outbound indirect flight with Sun Country Airlines, departs from Washington Dulles on Thu, 20 Aug, arriving in Denver International.Price includes taxes and charges.From R 2,530, select.

Find the cheapest month to fly from Washington Dulles to Denver

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to Denver flights are currently cheapest in February.
Dec
from R 2,306
Jan
from R 1,342
Feb
from R 1,087
Mar
from R 1,171
Apr
from R 3,022
May
from R 2,532
Jun
from R 3,022
Jul
from R 2,873
Aug
from R 2,530
Sep
from R 3,217
Oct
Find prices
Nov
Find prices

Direct flights from Washington Dulles to Denver

Alternative Washington Dulles to Denver routes

Looking for the cheapest, fastest or easiest route from Washington Dulles to Denver? You could fly into the following airports instead.

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

There are 4 airports in Denver: Denver Arapahoe Co, Broomfield, Denver International, and Northern Colorado Regional.
The best price we found for a return flight from Washington Dulles to Denver is R 2,155. 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.
4 hours and 5 minutes is the average flight time from Washington Dulles to Denver.
United, Southwest Airlines and Copa fly direct from Washington Dulles to Denver.
As of December 2025, there are 141 flights per week flying from Washington Dulles to Denver.
The cheapest month to fly from Washington Dulles to Denver is usually February.
If you're flying from Washington Dulles Airport, the cheapest airport near Denver is Denver International – which is 29.9 km away from the centre of Denver. We've found flights into this airport from R 2,155.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Denver on Sunday, 8 February 2026.
Yes – the average flight time is 4 hours and 5 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 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 Denver is around 40 days in advance, so don’t leave your flight to the last minute.
In December, the average temperature is usually around -1°C. July is typically the warmest month in Denver, when it usually averages around 31°C. You can expect the least rain in January. The coldest month is December, with temperatures averaging -6°C. The rainiest month is July.
Currently, Frontier Airlines and United offer the cheapest flight tickets to Denver.

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

  • Expect to be travelling for 3 hours 20 minutes. That's the average time for a direct flight from Washington Dulles International Airport to Denver.

  • Washington Dulles International Airport is located in Washington DC. Based in the UTC-6 timezone, Denver is two hours behind Washington DC.

  • With 62 weekly flights between the two airports, Washington Dulles International Airport (IAD) to Denver International Airport (DEN) is the most popular route. Southwest Airlines operates the earliest flight at 05:00. If you prefer to get more out of your day before leaving, the last flight from IAD to DEN is with United Airlines at 22:25.

  • For a stress-free journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This leaves you with plenty of time to board your IAD to Denver flight.

  • Delays at check-in and security are likely if you're jetting off during high season, so give yourself some extra breathing space. A good general rule for peak times? Get there up to four hours ahead for international flights and at least two hours for domestic departures.

  • You can book a direct Washington Dulles International Airport to Denver ticket. Start your journey at IAD and arrive at Denver International Airport (DEN).

  • Look out for deals with United Airlines. This carrier operates direct flights from Washington Dulles International Airport to Denver.

  • IAD is around 40 kilometres from central Washington DC. If you're catching a cab, driving or ride-sharing from the centre, it'll take you 50 minutes or so to get there, depending on traffic. If you're planning to take public transport, expect the journey time to be around 1 hour 10 minutes.

  • In search of a hotel close to IAD? If you're catching an early flight from Washington Dulles International Airport to Denver, these accommodation options put the terminal practically at your doorstep:

  • Of the departures from Washington Dulles International Airport, 74.39% touch down on time at their destination.

  • You'll find IAD at 1 Saarinen Circle.

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

  • R 1,087 is the lowest price we've found for a one-way Washington Dulles International Airport to Denver flight. A round-trip flight ticket right now is R 2,155. Depending on when and how early you book, these fares may change.

  • Score cheap flights from IAD to Denver by booking one month ahead. According to our research, that's the best time for finding a bargain.

  • Schedule your trip for May. That's the best month for landing the biggest deals on Washington Dulles International Airport to Denver tickets. If your travel dates are flexible, use the 'Whole month' tool to access the cheapest price across each month.

  • You don't need to keep looking every day to find out if fares have dropped when you create a Price Alert. We'll let you know when there's an even better deal on cheap flights from IAD to Denver.

  • Pick your preferred departure and arrival times, airlines and number of stops with our filters. Then, sort the results for your flight from Washington Dulles International Airport to Denver by 'Best,' 'Fastest' or 'Cheapest.'

Airports in Denver

Denver International Airport (DEN)

  • Denver International Airport (DEN) is around 40 kilometres from central Denver. If you're catching a cab or a ride-share, the drive takes about 35 minutes.

  • If you're travelling on public transport, expect a journey time of about 1 hour 30 minutes.

  • After your flight from Washington Dulles International Airport to Denver has landed, relax and unwind at a hotel close by. Baymont by Wyndham Denver International Airport is a convenient option that's a quick drive from DEN.

  • Follow your own route with a Denver International Airport rental car. Pick up a set of wheels from Routes Car Rentals, Dollar or Budget and chase adventure across Denver and beyond.

  • Lock in the best deal by booking your vehicle from Denver International Airport around one week in advance of your flight from IAD to Denver.

  • DEN is located at 8500 Pena Boulevard.

Best time to go to Denver

  • Visit Denver in high season if you want a lively atmosphere, but remember that prices may be higher. Alternatively, book your flights from Washington Dulles International Airport to Denver during low season when prices are cheaper and crowds are smaller.

  • The warmest month in Denver is July, with temperatures ranging between 14ºC (57ºF) and 32ºC (90ºF). Book your Washington Dulles International Airport to Denver flight ticket then if this is the type of weather you enjoy.

  • January has average temperatures of between -9ºC (16ºF) and 7ºC (45ºF). Search for a cheap ticket from IAD to Denver around that time if you'd rather travel in cooler conditions.

More about Denver

Explore more of United States

  • Denver has loads to offer, but there are so many other parts of United States waiting to be explored. Around 105 kilometres south of Denver, a trip to Colorado Springs will fill your itinerary to the brim. Check out popular attractions like US Northern Command (USNORTHCOM) / North American Aerospace Defence Command (NORAD) Headquarters, Cheyenne Mountain Air Force Station and National Strength and Conditioning Association (NSCA).

  • If there's time to check out another well-known destination in United States, consider Pueblo, about 161 kilometres south of Denver. Pueblo Weisbrod Aircraft Museum, Rosemount Museum and Pueblo Zoo are among its 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.