In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What is the cheapest time of day to fly from SUX to IAD?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Sioux City to Washington, D.C. Dulles Intl Airport as you normally would.

What airport do you fly from for flights from Sioux City to Washington, D.C. Dulles Intl?

For a flight from Sioux City to Washington, D.C. Dulles Intl, you will be flying from Sioux Gateway. Sioux City Sioux Gateway (SUX) is just 7.0 mi from the center of the city. Sioux Gateway is the only Sioux City airport and it handles 0 outbound flights to Washington, D.C. Dulles Intl per day. 0 airlines have flights to Washington, D.C. Dulles Intl from Sioux City Sioux Gateway on a regular basis.

Can I find deals for flights from Sioux City to Dulles Intl that include hotel bookings?

Yes. In addition to deals on Sioux City to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Sioux City to Dulles Intl?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sioux City to Dulles Intl.

Can I find deals for business class flights from Sioux City to Dulles Intl?

Yes. Cheapflights offers flight deals from Sioux City to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$468+ Flights from Sioux City to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Sioux City to Dulles Intl

Round-trip from	$468 (United Airlines)

From Sioux City Sioux Gateway to Washington, D.C. Dulles Intl

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Find flight deals from Sioux City to Dulles Intl

Cheapest flights from Sioux City to Dulles Intl
Explore the most affordable flight options available from Sioux City to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Tue 10/146:51 pmSUX - IAD

1 stop9h 31mUnited Airlines

Tue 10/216:50 pmIAD - SUX

1 stop5h 10mUnited Airlines

Deal found 7/28

$468

Best flights from Sioux City to Dulles Intl
Discover carefully curated flight deals from Sioux City to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2025.

Tue 10/146:51 pmSUX - IAD

1 stop9h 31mUnited Airlines

Tue 10/216:50 pmIAD - SUX

1 stop5h 10mUnited Airlines

Deal found 7/28

$468

Cheapflights Fare Finder

Use the filters below to find and compare flights from Sioux City to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Sioux CityWashington, D.C.

SUX - IAD

SUXIAD

Sioux City Sioux Gateway

Tue 10/14

6:51 pm-5:22 am

1 stop9h 31m

Washington, D.C. Dulles Intl

Tue 10/21

6:50 pm-11:00 pm

1 stop5h 10m

$468

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Best time to book a flight from Sioux City to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Sioux City with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Sioux City to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Sioux City to Washington, D.C. Dulles Intl Airport?

Currently, July is the cheapest month in which you can book a flight from Sioux City to Washington, D.C. Dulles Intl Airport (average of $306). Flying from Sioux City to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Dulles Intl

See what other customers who have flown with United Airlines from Sioux City to Washington, D.C. Dulles Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,899 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

United Airlines

7.4

Good

8,899 reviews

United Airlines

7.4

Good

8,899 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

What airport do you fly from for flights from Sioux City to Washington, D.C. Dulles Intl?
For a flight from Sioux City to Washington, D.C. Dulles Intl, you will be flying from Sioux Gateway. Sioux City Sioux Gateway (SUX) is just 7.0 mi from the center of the city. Sioux Gateway is the only Sioux City airport and it handles 0 outbound flights to Washington, D.C. Dulles Intl per day. 0 airlines have flights to Washington, D.C. Dulles Intl from Sioux City Sioux Gateway on a regular basis.
Can I find deals for flights from Sioux City to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Sioux City to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Sioux City to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sioux City to Dulles Intl.
Can I find deals for business class flights from Sioux City to Dulles Intl?
Yes. Cheapflights offers flight deals from Sioux City to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Sioux City to Washington, D.C. Dulles Intl Airport?
Currently, July is the cheapest month in which you can book a flight from Sioux City to Washington, D.C. Dulles Intl Airport (average of $306). Flying from Sioux City to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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$468+ Cheap flights from Sioux City (SUX) to Dulles Intl (IAD)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/14. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Sioux City to Dulles Intl with Cheapflights

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2. Select your favorite providers

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Cheap flight deals from Sioux City to Dulles Intl

Round-trip from

Find flight deals from Sioux City to Dulles Intl

Cheapest flights from Sioux City to Dulles IntlExplore the most affordable flight options available from Sioux City to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Explore the most affordable flight options available from Sioux City to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Sioux City to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from Sioux City to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Sioux City with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Sioux City to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Sioux City to Washington, D.C. Dulles Intl Airport?

Reviews of airlines servicing Dulles Intl

See what other customers who have flown with United Airlines from Sioux City to Washington, D.C. Dulles Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Sioux City to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Sioux City to Washington, D.C. Dulles Intl?

Can I find deals for flights from Sioux City to Dulles Intl that include hotel bookings?

How can I find direct flights from Sioux City to Dulles Intl?

Can I find deals for business class flights from Sioux City to Dulles Intl?

What is the cheapest month to book a flight from Sioux City to Washington, D.C. Dulles Intl Airport?

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Browse thousands of different options on Cheapflights for your next trip

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Cheapest flights from Sioux City to Dulles Intl
Explore the most affordable flight options available from Sioux City to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.