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$442+ Cheap flights from Dulles Intl (IAD) to Sioux City (SUX)

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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SUX
Feb 15 — Feb 221
Sun 2/15
Sun 2/22
1 adult, Economy
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Cheap flight deals from Dulles Intl to Sioux City

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Sioux City (SUX). 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 January 16, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$442
(United Airlines)
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Sioux City Sioux Gateway flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Sioux City Sioux Gateway flights.
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From Washington, D.C. Dulles Intl to Sioux City Sioux Gateway
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Find flight deals from Dulles Intl to Sioux City

Cheapest flights from Dulles Intl to Sioux City
Explore the most affordable flight options available from Dulles Intl to Sioux City. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 16, 2026.

This United Airlines deal was found by Cheapflights users on 1/15. 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 2/287:42 pm
IAD
-
SUX
1 stop16h 03m
United Airlines
Wed 3/41:00 pm
SUX
-
IAD
1 stop7h 18m
United Airlines
Deal found 1/15$442
This United Airlines deal was found by Cheapflights users on 1/15. 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.
Fri 1/301:05 pm
IAD
-
SUX
1 stop5h 23m
United Airlines
Tue 2/36:00 am
SUX
-
IAD
1 stop8h 12m
United Airlines
Deal found 1/15$468
This United Airlines deal was found by Cheapflights users on 1/15. 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.
Thu 2/1210:25 pm
IAD
-
SUX
1 stop26h 17m
United Airlines
Thu 2/191:00 pm
SUX
-
IAD
1 stop7h 18m
United Airlines
Deal found 1/15$605

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Sioux City 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 January 16, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Sioux City that are best for you.

Fly from

Dulles Intl

Fly to

Sioux City

Route

Depart

Return

Price

Washington, D.C.Sioux City

IAD - SUX

IADSUX

Washington, D.C. Dulles Intl

Sat 2/28

3:58 pm-10:45 am

1 stop19h 47m

Sioux City Sioux Gateway

Wed 3/4

1:00 pm-9:18 pm

1 stop7h 18m

$442

Washington, D.C.Sioux City

IAD - SUX

IADSUX

Washington, D.C. Dulles Intl

Fri 1/30

1:05 pm-5:28 pm

1 stop5h 23m

Sioux City Sioux Gateway

Tue 2/3

6:00 am-3:12 pm

1 stop8h 12m

$468

Washington, D.C.Sioux City

IAD - SUX

IADSUX

Washington, D.C. Dulles Intl

Thu 2/12

8:20 am-5:41 pm

2 stops10h 21m

Sioux City Sioux Gateway

Thu 2/19

1:00 pm-9:18 pm

1 stop7h 18m

$617

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

Compare providers for flights from Dulles Intl to Sioux City

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Sioux City in January.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Sioux City flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Washington, D.C. Dulles Intl Airport-Sioux City flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Sioux City flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Sioux City flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-Sioux City flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

Have a flexible travel schedule? Discover the best time to fly to Sioux City from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to Sioux City

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

Currently, October is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Sioux City (average of $126). Flying from Washington, D.C. Dulles Intl Airport to Sioux City in December is currently the most expensive (average of $458). 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 Dulles Intl to Sioux City. 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 into for flights to Sioux City from Washington, D.C. Dulles Intl?

    Located just 7.0 mi from the city center, Sioux City Sioux Gateway is the airport most travelers will use when flying to Sioux City from Washington, D.C. Dulles Intl. Booking flights from Washington, D.C. Dulles Intl to Sioux Gateway (SUX) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. Dulles Intl from 0 different airlines.

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

    Airlines like United Airlines fly from Washington, D.C. Dulles Intl Airport to Sioux City in about 19h 47m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 1017 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl to Sioux City 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 Washington, D.C. Dulles Intl Airport to Sioux City?

    Currently, October is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Sioux City (average of $126). Flying from Washington, D.C. Dulles Intl Airport to Sioux City in December is currently the most expensive (average of $458). 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.

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