How far in advance should I book tickets for a flight with Southwest from Washington, D.C. Dulles Intl Airport to Denver?

Generally, when trying to get a below average price for your ticket, try to book around 13 days before departure. For the cheapest possible price, our data suggests booking 30 days before departure.

Is Southwest the cheapest airline to fly with from Washington, D.C. Dulles Intl Airport to Denver?

With an average price of $298 return, Southwest is not the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to Denver with. Instead, for the lowest price, our data suggests flying with Frontier, where a return flight costs $244 on average.

Does Southwest fly direct to Denver from Washington, D.C. Dulles Intl Airport?

Yes, Southwest does offer direct flights for the route, with around 11 flights per week.

What’s the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to Denver with Southwest?

On average, the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to Denver with Southwest is Monday, when prices are around $81. The most expensive day is generally Saturday, where the average price is around $113.

What’s the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Denver with Southwest?

The cheapest month for Southwest flights to Denver from Washington, D.C. Dulles Intl Airport is generally August, where plane tickets cost $108 on average. If possible, try to avoid the most expensive months of November and December, where tickets cost $231 and $370 respectively.

$81 Cheap Southwest Flights from Washington, D.C. Dulles Intl Airport to Denver

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Flight Deals

Cheap Southwest Flight Deals from Washington, D.C. Dulles Intl Airport to Denver

Here are some of the best deals found on KAYAK recently from Southwest for round-trip flights from Washington, D.C. Dulles Intl Airport to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip Southwest flight deals from Washington, D.C. Dulles Intl Airport to Denver

Fri, Dec 12 - Sun, Dec 14

7:50 pm - 9:40 pmIAD-DEN

3h 50mnonstop

6:15 pm - 11:30 pmDEN-IAD

3h 15mnonstop

$141Southwest

Find Deal

Sun, Nov 9 - Sat, Nov 15

5:05 am - 7:00 amIAD-DEN

3h 55mnonstop

5:05 pm - 10:15 pmDEN-IAD

3h 10mnonstop

$151Southwest

Find Deal

Fri, Nov 7 - Wed, Nov 12

7:50 pm - 9:40 pmIAD-DEN

3h 50mnonstop

6:30 am - 5:05 pmDEN-IAD

8h 35m1 stop

$161Southwest

Find Deal

Thu, Nov 6 - Sat, Nov 8

5:05 am - 7:00 amIAD-DEN

3h 55mnonstop

6:00 am - 3:15 pmDEN-IAD

7h 15m1 stop

$171Southwest

Find Deal

Wed, Dec 3 - Sun, Dec 7

7:40 am - 9:30 amIAD-DEN

3h 50mnonstop

6:15 pm - 11:30 pmDEN-IAD

3h 15mnonstop

$190Southwest

Find Deal

Wed, Nov 5 - Wed, Nov 12

7:40 am - 9:30 amIAD-DEN

3h 50mnonstop

6:30 am - 5:05 pmDEN-IAD

8h 35m1 stop

$200Southwest

Find Deal

Fri, Oct 31 - Sat, Nov 1

5:40 am - 7:30 amIAD-DEN

3h 50mnonstop

5:40 pm - 11:00 pmDEN-IAD

3h 20mnonstop

$206Southwest

Find Deal

Wed, Nov 12 - Wed, Nov 19

5:45 pm - 7:45 pmIAD-DEN

4h 00mnonstop

4:50 pm - 10:00 pmDEN-IAD

3h 10mnonstop

$209Southwest

Find Deal

Wed, Nov 5 - Sat, Nov 8

7:40 am - 9:30 amIAD-DEN

3h 50mnonstop

6:00 am - 3:15 pmDEN-IAD

7h 15m1 stop

$210Southwest

Find Deal

Fri, Oct 31 - Mon, Nov 3

3:50 pm - 9:45 pmIAD-DEN

7h 55m1 stop

5:00 pm - 10:10 pmDEN-IAD

3h 10mnonstop

$216Southwest

Find Deal

Useful Info

Low season	January
High season	July
Cheapest flight	$81
Average price round-trip	$333

Best time to beat the crowds with an average 10% drop in price.

Most popular time to fly and prices are also 4% lower on average.

Flight from Washington Dulles Airport to Denver

(price for this month)

When to Book Flights with Southwest from Washington, D.C. Dulles Intl Airport to Denver

Average price per month

Flight prices as travel date approaches

How far in advance should I book tickets for a flight with Southwest from Washington, D.C. Dulles Intl Airport to Denver?
Generally, when trying to get a below average price for your ticket, try to book around 13 days before departure. For the cheapest possible price, our data suggests booking 30 days before departure.
Is Southwest the cheapest airline to fly with from Washington, D.C. Dulles Intl Airport to Denver?
With an average price of $298 return, Southwest is not the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to Denver with. Instead, for the lowest price, our data suggests flying with Frontier, where a return flight costs $244 on average.
What is the cheapest Southwest flight from Washington, D.C. Dulles Intl Airport to Denver?
In the last 3 days, the lowest price for a flight with Southwest from Washington, D.C. Dulles Intl Airport to Denver was $216 for a return flight and $108 for a one-way flight.
Does Southwest fly direct to Denver from Washington, D.C. Dulles Intl Airport?
Yes, Southwest does offer direct flights for the route, with around 11 flights per week.
What’s the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to Denver with Southwest?
On average, the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to Denver with Southwest is Monday, when prices are around $81. The most expensive day is generally Saturday, where the average price is around $113.
What’s the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Denver with Southwest?
The cheapest month for Southwest flights to Denver from Washington, D.C. Dulles Intl Airport is generally August, where plane tickets cost $108 on average. If possible, try to avoid the most expensive months of November and December, where tickets cost $231 and $370 respectively.

8.0

Very good4,235 verified ratings

7.5Entertainment

7.0Food

8.1Boarding

8.0Comfort

8.6Crew

Pros +

Cons -

Show reviews that mention

10.0 Wonderful

Aleksandar, Oct 2025

OAK-SAN

On time, and it was not full flight

4.0 Mediocre

Annette, Oct 2025

LGA-MCI

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

10.0 Wonderful

Gerald, Oct 2025

SJC-PDX

Boarding quick & efficient. Crew was friendly. Arrived early

6.0 Okay

Hung, Oct 2025

PHX-ABQ

mandatory demand customer to check their carry on because not enough people check bags.

8.0 Very good

Annette, Oct 2025

MCI-LGA

Good non stop is always good

10.0 Wonderful

Gabriel, Sep 2025

DEN-SMF

Connecting flight is on time and boarding was a breeze!

10.0 Wonderful

Gabriel, Sep 2025

LGA-DEN

Easy boarding process. No delays!

10.0 Wonderful

Melissa, Sep 2025

MDW-DTW

Excellent

10.0 Wonderful

Melissa, Sep 2025

MSY-MDW

Excellent. Would encourage Southwest to keep current boarding procedures with free style seating. Makes for a fantastic experience

10.0 Wonderful

Robert, Sep 2025

RNO-LAS

As always, the entire Southwest experience was perfect. Purchasing the tickets on the Southwest web site was effortless, departure and arrival gates were spotless and comfortable, plane was clean and comfortable, crew was excellent and flight was on time. Wheelchair service in Las Vegas at departure was somewhat chaotic and disjointed, but I am not sure if that was Southwest problem, airport problem or combination.

Everything you need to know for your flight from Washington, D.C. Dulles Intl Airport to Denver

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Flights to other cities

Return flight deals

Southwest flights

Cabin class types available on flights to Denver

First Class flights from Washington, D.C. Dulles Intl Airport to Denver

Business Class flights from Washington, D.C. Dulles Intl Airport to Denver

Prem Econ Class flights from Washington, D.C. Dulles Intl Airport to Denver

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IAD - DEN

$81 Find Cheap Southwest Flights from Washington, D.C. Dulles Intl Airport to Denver

Search hundreds of travel sites at once for deals on Southwest flights from Washington, D.C. Dulles Intl Airport to Denver

Cheap Southwest Flight Deals from Washington, D.C. Dulles Intl Airport to Denver

Recent round-trip Southwest flight deals from Washington, D.C. Dulles Intl Airport to Denver

Recent one-way Southwest flight deals from Washington, D.C. Dulles Intl Airport to Denver

Recent last minute Southwest flight deals from Washington, D.C. Dulles Intl Airport to Denver

Recent direct Southwest flight deals from Washington, D.C. Dulles Intl Airport to Denver

Good to know

When to Book Flights with Southwest from Washington, D.C. Dulles Intl Airport to Denver

FAQs for flying to Denver with Southwest

How far in advance should I book tickets for a flight with Southwest from Washington, D.C. Dulles Intl Airport to Denver?

Is Southwest the cheapest airline to fly with from Washington, D.C. Dulles Intl Airport to Denver?

What is the cheapest Southwest flight from Washington, D.C. Dulles Intl Airport to Denver?

Does Southwest fly direct to Denver from Washington, D.C. Dulles Intl Airport?

What’s the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to Denver with Southwest?

What’s the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Denver with Southwest?

Southwest Customer Reviews

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Everything you need to know for your flight from Washington, D.C. Dulles Intl Airport to Denver

Cabin class types available on flights to Denver

Cabin classes available on flights to Washington, D.C. Dulles Intl Airport. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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Flights to other popular destinations

The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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Top Southwest flights

The most popular destinations for flights with Southwest according to clicks from KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.