Find Cheap Flights from Washington Dulles Intl to Denver International (IAD - DEN)

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Wed 1/24
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Good to Know

Low Season:
October
Best time to beat the crowds
3%
expected price decrease
High Season:
June
Most popular time to fly
5%
expected price increase
Average Price:
$372
(avg. price over the last 2 weeks)
Good Deal:
$249
or less (round trip)

When to Book Flights from Washington Dulles Intl to Denver International

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $249 or less.
The cheapest flight from Washington Dulles Intl to Denver International was found 37 days before departure, on average.
Book at least 2 weeks before departure in order to get a below-average price.
High season is considered to be May, June and July. The cheapest month to fly is October.
Morning departure is around 5% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Washington Dulles Intl to Denver International Flights

How long does a flight from Washington Dulles Intl to Denver International take?
An average nonstop flight takes 3h 46m, covering a distance of 1449 miles.
How many flights are there between Washington Dulles Intl and Denver International?
There are 303 (nonstop) flights between Washington Dulles Intl and Denver International per week, averaging 43 per day.
Which airlines provide the cheapest flights from Washington Dulles Intl to Denver International?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($88), United ($139) and Multiple Airlines ($139).
Do I need a passport to fly between Washington Dulles Intl and Denver International?
No.
Which airlines fly most frequently between Washington Dulles Intl and Denver International?
United (14 times daily), Brussels Airlines (6 times daily), South African (6 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Washington Dulles Intl to Denver International?
For Washington Dulles Intl to Denver International, Sunday is the cheapest day to fly on average and Friday is the most expensive. Flying from Denver International back to Washington Dulles Intl, the best deals are generally found on Wednesday, with Friday being the most expensive.

Book cheap flights from Washington Dulles Intl to Denver International (round-trip)

Airports
Origin
Washington
$88
only
$88
Destination
Denver
$88
only
$88
Sun, Apr 8
IAD
DEN
3h 58m
Mon, Apr 9
DEN
IAD
3h 20m
Trip: 2 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 110 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
DEN
Mediocre 2.0

Nothing!

6hour delay, poor customer service,

IAD
DEN
Good 6.0

Better seat than last time still could feel my extremities apon arrival

4 buck$ for a club soda 38 $ per bag

IAD
DEN
Excellent 8.0

Comfort

Don't have food free inside the fly

IAD
DEN
Okay 4.0

The crew and their good nature under difficult circumstances were the only bright spot in an otherwise very disappointing experience.

Unacceptable to have to pay $45 for a carry-on, especially with no advance warning about this charge. Also insulting that water was the only free refreshment, with charges for everything else. The 3-hour delay was in part due to bad weather, but at least 1 hour was due to taxiing out, then holding for recalculating the route, then returning to the gate where it took an additional 30 minutes for the fuel truck to arrive.

IAD
DEN
Excellent 9.0

Very organized boarding, smooth flight and got in 40 minutes early.

Sure they make you pay for everything - but that's to be expected from Frontier.

Mon, Feb 5
IAD
DEN
4h 03m
Tue, Feb 6
DEN
IAD
3h 12m
Trip: 2 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 119 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
IAD
DEN
Excellent 10.0

Everything

Nothing

IAD
DEN
Excellent 8.0

Pilot made up for a late departure & we arrived in Denver a few minutes early. Skies were abut rough for a short time.

IAD
DEN
Good 7.6

The boarding procedure, and flight were completely uneventful. Flight attendants were nice. Slept through the snack if there was one offered.

Seatback entertainment by directv is getting a little old at this point. I didn't test it but I believe you can watch content on demand on your own device instead but it's hard to keep the seat back screen turned off. Be weary of tight international to domestic connections at IAD. I had an hour and a half between flights and made it to the gate when they had called group 5 for boarding. This is with Global Entry, TSA Pre-check and priority tags on my bags. I'm sure many others without the above were not so lucky.

IAD
DEN
Mediocre 3.6

Well, the plane didn't crash, so that was nice. The plane was clean and the newer 737-900s are pretty decent.

Every time I fly United, I pretty much feel like it is an honor on the level of being knighted to get the privilege to fly with this airline. Thank you so much for being willing to take my money in exchange for a service, United. Bless you. I'm sure if you spend $10k + a year with them, they'll happily massage your feet as you ride along, but anyone else seems to be each flight attendant's personal enemy that they must frustrate as often as possible. Also, thank you, United, you beautiful prom queen you, for changing my seat from a window to a middle because it pleased you. It honors me to be your jest.

IAD
DEN
Excellent 9.0

Your seating was spacious!

The unfriendliness of the crew.

Mon, May 14
IAD
DEN
3h 57m
Tue, May 22
DEN
IAD
3h 15m
Trip: 9 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Mar 3
IAD
DEN
3h 54m
Tue, Mar 6
DEN
IAD
3h 04m
Trip: 4 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 119 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
IAD
DEN
Excellent 8.0

I wish it was always this easy.

I wish the seats and leg room could be a little more generous for those of us who don't fly first class.

IAD
DEN
Excellent 8.0

Pilot made up for a late departure & we arrived in Denver a few minutes early. Skies were abut rough for a short time.

IAD
DEN
Good 7.2

Boarding at Dulles was stupid. The line for 1st class and Premier was against the wall, so these passengers had to fight their way through the lines for passengers in sections 3,4,5 just to get to their line. It would make more sense to have groups 1 & 2 in lines which face the door, and keep the lines for 3,4,5 as they are--that is, parallel to the wall. Or, have the lines in the opposite order, so that 1&2 are closest to the concourse, and 5 is next to the wall I actually felt sorry for these 'privileged' passengers who had to fight their way through the other boarding lines just to board when their section was called

IAD
DEN
Mediocre 3.3

Not much. We did arrive alive, which is the best part of it.

Late, very late without any explanation. Only one food service in flight.

IAD
DEN
Good 6.0

Flight was delayed for a hour and half because of equipment. Credit goes to United for promptly putting use on another flight that just came in from Denver. All in a it was a long day.

Wed, May 23
IAD
DEN
3h 57m
Tue, May 29
DEN
IAD
3h 17m
Trip: 7 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 110 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
DEN
Good 7.0

Flight was delayed over 5 hours. I missed most of the meeting I was attending for the day.

IAD
DEN
Good 6.0

Better seat than last time still could feel my extremities apon arrival

4 buck$ for a club soda 38 $ per bag

IAD
DEN
Mediocre 2.0

All of the unexpected baggage fees ($40 for a carry on bag? Really?) and fees if you wanted to pick your seat. You even had to pay for snacks and drinks that are always complimentary! And I have never sat in more uncomfortable airplane seats (they didn't recline AT ALL). Plus could they have made a smaller seat tray? Frontier is a joke of an airline

IAD
DEN
Mediocre 2.0

Delays from weather are unavoidable, I know. But an eight our delay with no connecting flights for 24 hours? I'm good. Ended up booking a delta flight to get to my destination. Best part? I still haven't left yet. I was supposed to land thirty minutes ago at my final destination.

IAD
DEN
Excellent 9.0

Very organized boarding, smooth flight and got in 40 minutes early.

Sure they make you pay for everything - but that's to be expected from Frontier.

Wed, Apr 18
IAD
DEN
3h 46m
Sun, Apr 22
DEN
IAD
3h 20m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Mar 10
IAD
DEN
3h 56m
Wed, Mar 14
DEN
IAD
3h 15m
Trip: 4 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 119 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
IAD
DEN
Mediocre 3.3

Not much. We did arrive alive, which is the best part of it.

Late, very late without any explanation. Only one food service in flight.

IAD
DEN
Excellent 9.0

Your seating was spacious!

The unfriendliness of the crew.

IAD
DEN
Mediocre 3.6

Well, the plane didn't crash, so that was nice. The plane was clean and the newer 737-900s are pretty decent.

Every time I fly United, I pretty much feel like it is an honor on the level of being knighted to get the privilege to fly with this airline. Thank you so much for being willing to take my money in exchange for a service, United. Bless you. I'm sure if you spend $10k + a year with them, they'll happily massage your feet as you ride along, but anyone else seems to be each flight attendant's personal enemy that they must frustrate as often as possible. Also, thank you, United, you beautiful prom queen you, for changing my seat from a window to a middle because it pleased you. It honors me to be your jest.

IAD
DEN
Good 6.0

Flight was delayed for a hour and half because of equipment. Credit goes to United for promptly putting use on another flight that just came in from Denver. All in a it was a long day.

IAD
DEN
Excellent 8.0

Pilot made up for a late departure & we arrived in Denver a few minutes early. Skies were abut rough for a short time.

Mon, Jun 4
IAD
DEN
3h 57m
Mon, Jun 11
DEN
IAD
3h 17m
Trip: 8 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 110 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
DEN
Mediocre 2.0

Nothing!

6hour delay, poor customer service,

IAD
DEN
Mediocre 2.0

Terrible service, unprofessional, impractical and unreasonable airline that should never be suggested.

IAD
DEN
Excellent 8.0

Comfort

Don't have food free inside the fly

IAD
DEN
Mediocre 2.0

Delays from weather are unavoidable, I know. But an eight our delay with no connecting flights for 24 hours? I'm good. Ended up booking a delta flight to get to my destination. Best part? I still haven't left yet. I was supposed to land thirty minutes ago at my final destination.

IAD
DEN
Good 7.0

Flight was delayed over 5 hours. I missed most of the meeting I was attending for the day.

Mon, Mar 26
IAD
DEN
3h 56m
Wed, Apr 4
DEN
IAD
3h 13m
Trip: 10 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 119 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
IAD
DEN
Mediocre 3.6

Well, the plane didn't crash, so that was nice. The plane was clean and the newer 737-900s are pretty decent.

Every time I fly United, I pretty much feel like it is an honor on the level of being knighted to get the privilege to fly with this airline. Thank you so much for being willing to take my money in exchange for a service, United. Bless you. I'm sure if you spend $10k + a year with them, they'll happily massage your feet as you ride along, but anyone else seems to be each flight attendant's personal enemy that they must frustrate as often as possible. Also, thank you, United, you beautiful prom queen you, for changing my seat from a window to a middle because it pleased you. It honors me to be your jest.

IAD
DEN
Mediocre 3.3

Not much. We did arrive alive, which is the best part of it.

Late, very late without any explanation. Only one food service in flight.

IAD
DEN
Good 6.0

I made it safely to my destination

I have been flying Lufthansa for over 15 years and the service is steadily declining. It started with issues during online check-in, a delay in Frankfurt which resulted in a very tight connection. I had to leave my bags behind to make it and the ground personell was of zero help. Oh, and premier silver status is good for nothing on Lufthansa. Thanks StarAlliance.

IAD
DEN
Good 7.6

The boarding procedure, and flight were completely uneventful. Flight attendants were nice. Slept through the snack if there was one offered.

Seatback entertainment by directv is getting a little old at this point. I didn't test it but I believe you can watch content on demand on your own device instead but it's hard to keep the seat back screen turned off. Be weary of tight international to domestic connections at IAD. I had an hour and a half between flights and made it to the gate when they had called group 5 for boarding. This is with Global Entry, TSA Pre-check and priority tags on my bags. I'm sure many others without the above were not so lucky.

IAD
DEN
Good 6.0

Flight was delayed for a hour and half because of equipment. Credit goes to United for promptly putting use on another flight that just came in from Denver. All in a it was a long day.

Tue, Jun 5
IAD
DEN
3h 57m
Mon, Jun 11
DEN
IAD
3h 17m
Trip: 7 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 110 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
DEN
Okay 4.0

The crew and their good nature under difficult circumstances were the only bright spot in an otherwise very disappointing experience.

Unacceptable to have to pay $45 for a carry-on, especially with no advance warning about this charge. Also insulting that water was the only free refreshment, with charges for everything else. The 3-hour delay was in part due to bad weather, but at least 1 hour was due to taxiing out, then holding for recalculating the route, then returning to the gate where it took an additional 30 minutes for the fuel truck to arrive.

IAD
DEN
Mediocre 2.3

Price of tickets

Flight 4 hours late missed connecting flight in Denver could not get out for two days due to overbooking and vacation would be over and promises refund and now fighting to get that back! Plus I have filled this survey out 3 times and you have not received it yet!

IAD
DEN
Mediocre 2.6

The flight was delayed for 7 hours, and the airline took almost 4 hours to even tell us what our options were for connecting flights.

IAD
DEN
Mediocre 2.0

Delays from weather are unavoidable, I know. But an eight our delay with no connecting flights for 24 hours? I'm good. Ended up booking a delta flight to get to my destination. Best part? I still haven't left yet. I was supposed to land thirty minutes ago at my final destination.

IAD
DEN
Good 7.0

Flight was delayed over 5 hours. I missed most of the meeting I was attending for the day.

Wed, Jul 4
IAD
DEN
3h 50m
Tue, Jul 10
DEN
IAD
3h 18m
Trip: 7 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 110 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
DEN
Mediocre 2.0

All of the unexpected baggage fees ($40 for a carry on bag? Really?) and fees if you wanted to pick your seat. You even had to pay for snacks and drinks that are always complimentary! And I have never sat in more uncomfortable airplane seats (they didn't recline AT ALL). Plus could they have made a smaller seat tray? Frontier is a joke of an airline

IAD
DEN
Mediocre 2.0

Delays from weather are unavoidable, I know. But an eight our delay with no connecting flights for 24 hours? I'm good. Ended up booking a delta flight to get to my destination. Best part? I still haven't left yet. I was supposed to land thirty minutes ago at my final destination.

IAD
DEN
Okay 4.0

The crew and their good nature under difficult circumstances were the only bright spot in an otherwise very disappointing experience.

Unacceptable to have to pay $45 for a carry-on, especially with no advance warning about this charge. Also insulting that water was the only free refreshment, with charges for everything else. The 3-hour delay was in part due to bad weather, but at least 1 hour was due to taxiing out, then holding for recalculating the route, then returning to the gate where it took an additional 30 minutes for the fuel truck to arrive.

IAD
DEN
Mediocre 2.3

Price of tickets

Flight 4 hours late missed connecting flight in Denver could not get out for two days due to overbooking and vacation would be over and promises refund and now fighting to get that back! Plus I have filled this survey out 3 times and you have not received it yet!

IAD
DEN
Excellent 8.0

Comfort

Don't have food free inside the fly

Tue, May 15
IAD
DEN
3h 57m
Sun, May 20
DEN
IAD
3h 15m
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Jan 30
IAD
DEN
4h 01m
Tue, Feb 6
DEN
IAD
3h 12m
Trip: 8 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 119 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
IAD
DEN
Mediocre 3.3

Not much. We did arrive alive, which is the best part of it.

Late, very late without any explanation. Only one food service in flight.

IAD
DEN
Good 6.0

Flight was delayed for a hour and half because of equipment. Credit goes to United for promptly putting use on another flight that just came in from Denver. All in a it was a long day.

IAD
DEN
Excellent 10.0

Arrived almost an hour early which was great.

IAD
DEN
Good 7.2

Boarding at Dulles was stupid. The line for 1st class and Premier was against the wall, so these passengers had to fight their way through the lines for passengers in sections 3,4,5 just to get to their line. It would make more sense to have groups 1 & 2 in lines which face the door, and keep the lines for 3,4,5 as they are--that is, parallel to the wall. Or, have the lines in the opposite order, so that 1&2 are closest to the concourse, and 5 is next to the wall I actually felt sorry for these 'privileged' passengers who had to fight their way through the other boarding lines just to board when their section was called

IAD
DEN
Excellent 10.0

The flight crew was welcoming and friendly throughout the flight. Even the pilot walked through the plane and chatted with the passengers prior to the flight and also made an announcement wishing a young boy a happy birthday from the flight crew.

Tue, Jul 31
IAD
DEN
3h 50m
Wed, Aug 8
DEN
IAD
3h 18m
Trip: 9 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 110 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
DEN
Mediocre 2.0

Nothing!

6hour delay, poor customer service,

IAD
DEN
Okay 4.5

Firswt time I have had to pay a fee for carry-on! Also first time I paid more than $30 for a regular size and weight checked bag!

IAD
DEN
Mediocre 2.0

All of the unexpected baggage fees ($40 for a carry on bag? Really?) and fees if you wanted to pick your seat. You even had to pay for snacks and drinks that are always complimentary! And I have never sat in more uncomfortable airplane seats (they didn't recline AT ALL). Plus could they have made a smaller seat tray? Frontier is a joke of an airline

IAD
DEN
Mediocre 2.0

Delays from weather are unavoidable, I know. But an eight our delay with no connecting flights for 24 hours? I'm good. Ended up booking a delta flight to get to my destination. Best part? I still haven't left yet. I was supposed to land thirty minutes ago at my final destination.

IAD
DEN
Excellent 8.0

Comfort

Don't have food free inside the fly

Mon, Mar 19
IAD
DEN
3h 57m
Sat, Apr 7
DEN
IAD
3h 20m
Trip: 20 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Jul 17
IAD
DEN
3h 50m
Mon, Jul 23
DEN
IAD
3h 18m
Trip: 7 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 110 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
DEN
Mediocre 2.6

The flight was delayed for 7 hours, and the airline took almost 4 hours to even tell us what our options were for connecting flights.

IAD
DEN
Excellent 9.0

Very organized boarding, smooth flight and got in 40 minutes early.

Sure they make you pay for everything - but that's to be expected from Frontier.

IAD
DEN
Mediocre 2.0

Delays from weather are unavoidable, I know. But an eight our delay with no connecting flights for 24 hours? I'm good. Ended up booking a delta flight to get to my destination. Best part? I still haven't left yet. I was supposed to land thirty minutes ago at my final destination.

IAD
DEN
Mediocre 2.0

All of the unexpected baggage fees ($40 for a carry on bag? Really?) and fees if you wanted to pick your seat. You even had to pay for snacks and drinks that are always complimentary! And I have never sat in more uncomfortable airplane seats (they didn't recline AT ALL). Plus could they have made a smaller seat tray? Frontier is a joke of an airline

IAD
DEN
Okay 4.5

Firswt time I have had to pay a fee for carry-on! Also first time I paid more than $30 for a regular size and weight checked bag!

Sun, Mar 4
IAD
DEN
3h 56m
Mon, Mar 26
DEN
IAD
3h 13m
Trip: 22 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 119 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
IAD
DEN
Excellent 8.0

Pilot made up for a late departure & we arrived in Denver a few minutes early. Skies were abut rough for a short time.

IAD
DEN
Excellent 10.0

Arrived almost an hour early which was great.

IAD
DEN
Good 6.0

Flight was delayed for a hour and half because of equipment. Credit goes to United for promptly putting use on another flight that just came in from Denver. All in a it was a long day.

IAD
DEN
Excellent 9.0

Your seating was spacious!

The unfriendliness of the crew.

IAD
DEN
Excellent 8.0

I wish it was always this easy.

I wish the seats and leg room could be a little more generous for those of us who don't fly first class.

Mon, Apr 2
IAD
DEN
3h 57m
Tue, Apr 10
DEN
IAD
3h 08m
Trip: 9 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 119 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
IAD
DEN
Good 7.2

Boarding at Dulles was stupid. The line for 1st class and Premier was against the wall, so these passengers had to fight their way through the lines for passengers in sections 3,4,5 just to get to their line. It would make more sense to have groups 1 & 2 in lines which face the door, and keep the lines for 3,4,5 as they are--that is, parallel to the wall. Or, have the lines in the opposite order, so that 1&2 are closest to the concourse, and 5 is next to the wall I actually felt sorry for these 'privileged' passengers who had to fight their way through the other boarding lines just to board when their section was called

IAD
DEN
Mediocre 3.6

Well, the plane didn't crash, so that was nice. The plane was clean and the newer 737-900s are pretty decent.

Every time I fly United, I pretty much feel like it is an honor on the level of being knighted to get the privilege to fly with this airline. Thank you so much for being willing to take my money in exchange for a service, United. Bless you. I'm sure if you spend $10k + a year with them, they'll happily massage your feet as you ride along, but anyone else seems to be each flight attendant's personal enemy that they must frustrate as often as possible. Also, thank you, United, you beautiful prom queen you, for changing my seat from a window to a middle because it pleased you. It honors me to be your jest.

IAD
DEN
Excellent 10.0

The flight crew was welcoming and friendly throughout the flight. Even the pilot walked through the plane and chatted with the passengers prior to the flight and also made an announcement wishing a young boy a happy birthday from the flight crew.

IAD
DEN
Excellent 10.0

Arrived almost an hour early which was great.

IAD
DEN
Good 7.6

The boarding procedure, and flight were completely uneventful. Flight attendants were nice. Slept through the snack if there was one offered.

Seatback entertainment by directv is getting a little old at this point. I didn't test it but I believe you can watch content on demand on your own device instead but it's hard to keep the seat back screen turned off. Be weary of tight international to domestic connections at IAD. I had an hour and a half between flights and made it to the gate when they had called group 5 for boarding. This is with Global Entry, TSA Pre-check and priority tags on my bags. I'm sure many others without the above were not so lucky.

Wed, Jun 6
IAD
DEN
3h 57m
Tue, Jun 19
DEN
IAD
3h 17m
Trip: 14 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 110 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
IAD
DEN
Good 7.0

Flight was delayed over 5 hours. I missed most of the meeting I was attending for the day.

IAD
DEN
Mediocre 2.0

All of the unexpected baggage fees ($40 for a carry on bag? Really?) and fees if you wanted to pick your seat. You even had to pay for snacks and drinks that are always complimentary! And I have never sat in more uncomfortable airplane seats (they didn't recline AT ALL). Plus could they have made a smaller seat tray? Frontier is a joke of an airline

IAD
DEN
Excellent 9.0

Very organized boarding, smooth flight and got in 40 minutes early.

Sure they make you pay for everything - but that's to be expected from Frontier.

IAD
DEN
Excellent 8.0

Comfort

Don't have food free inside the fly

IAD
DEN
Okay 4.5

Firswt time I have had to pay a fee for carry-on! Also first time I paid more than $30 for a regular size and weight checked bag!

Fri, Jan 26
IAD
DEN
3h 57m
Sun, Jan 28
DEN
IAD
6h 31m
Trip: 3 days
Overall 0.0 Poor
Based on 0 reviews
Show more results

Washington Dulles Intl to Denver International Flight Information

Avg. Flight Duration 3h 35m
Flights Arrive in Denver International
Flights Depart from Washington Dulles Intl
Flight Price $88
Distance 1449 miles
Airlines Frontier, United
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an and someone from our team will get back to you promptly.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.