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Dulles Intl

$318+ Cheap flights from Sioux City (SUX) to Dulles Intl (IAD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — IAD
Mar 11 — Mar 181
Wed 3/11
Wed 3/18
1 adult, Economy
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Cheap 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 February 9, 2026.

This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/211:00 pm
SUX
-
IAD
2 stops21h 49m
United Airlines
Wed 2/251:02 pm
IAD
-
SUX
1 stop5h 39m
United Airlines
Deal found 2/6$503
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/171:00 pm
SUX
-
IAD
1 stop7h 18m
United Airlines
Sat 2/2110:30 pm
IAD
-
SUX
1 stop20h 11m
United Airlines
Deal found 2/7$514

Find flight deals from Sioux City to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Sioux City (SUX) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 9, 2026.

Round-trip from

$503
(United Airlines)

One-way from

$318
(United Airlines)
From Sioux City Sioux Gateway to Washington, D.C. Dulles Intl
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One-way flight from Sioux City Sioux Gateway to Washington, D.C. Dulles Intl
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Sioux City to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 9, 2026.
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

Sioux City

Fly to

Dulles Intl

Route

Depart

Return

Price

Sioux CityWashington, D.C.

SUX - IAD

SUXIAD

Sioux City Sioux Gateway

Sat 2/21

1:00 pm-11:49 am

2 stops21h 49m

Washington, D.C. Dulles Intl

Wed 2/25

1:02 pm-5:41 pm

1 stop5h 39m

$503

Sioux CityWashington, D.C.

SUX - IAD

SUXIAD

Sioux City Sioux Gateway

Fri 3/6

6:10 am-1:05 pm

1 stop5h 55m

$318

Sioux CityWashington, D.C.

SUX - IAD

SUXIAD

Sioux City Sioux Gateway

Sun 3/1

6:46 pm-11:20 am

1 stop15h 34m

$346

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/6

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, October is the cheapest month in which you can book a flight from Sioux City to Washington, D.C. Dulles Intl Airport (average of $84). Flying from Sioux City to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $339). 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.

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?

    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.

  • How long is the flight from Sioux City to Washington, D.C. Dulles Intl Airport?

    Airlines like United Airlines fly from Sioux City to Washington, D.C. Dulles Intl Airport in about 21h 49m. The time it takes to get you to your destination can typically vary by up to . Sioux City and Washington, D.C. Dulles Intl Airport are separated by a distance of 1017 mi.

  • 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, October is the cheapest month in which you can book a flight from Sioux City to Washington, D.C. Dulles Intl Airport (average of $84). Flying from Sioux City to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $339). 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

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

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Herndon
Fredericksburg
Hanover
Linthicum Heights
Rockville
Laurel
Towson
Upper Marlboro
Manassas
Largo
Bowie
McLean
Clinton

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