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Sioux City

$203+ Cheap flights from Denver to Sioux City (DEN - SUX)

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 1/3. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SUX
Jan 25 — Feb 11
Sun 1/25
Sun 2/1
1 adult, Economy
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Cheap flight deals from Denver to Sioux City

Cheapest flights from Denver to Sioux City
Explore the most affordable flight options available from Denver to Sioux City. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 26, 2025.

This United Airlines deal was found by Cheapflights users on 12/22. 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.
Sun 12/283:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Wed 12/317:50 amSUX - DEN
1 stop26h 15mUnited Airlines
Deal found 12/22$616

Find flight deals from Denver to Sioux City

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) 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 December 26, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$254
(United Airlines)

One-way from

$203
(United Airlines)

Popular in

April

Cheapest in

February

Average price

$350

Good one-way deal

$173 or less
Provider with most accurate pricing for Denver Intl-Sioux City Sioux Gateway flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Sioux City Sioux Gateway flights.
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From Denver Intl to Sioux City Sioux Gateway
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One-way flight from Denver Intl to Sioux City Sioux Gateway
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Highest demand for flights based on searches. 12% potential increase in price ($49 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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Price to beat on a one-way flight from Denver Intl to Sioux City Sioux Gateway.
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver 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 December 26, 2025.
Use the filters below to find and compare flights from Denver to Sioux City that are best for you.

Fly from

Denver

Fly to

Sioux City

Route

Depart

Return

Price

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Fri 2/13

8:05 am-10:45 am

Nonstop1h 40m

Sioux City Sioux Gateway

Mon 2/16

6:00 am-6:54 am

Nonstop1h 54m

$214

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Thu 3/5

8:05 am-10:45 am

Nonstop1h 40m

Sioux City Sioux Gateway

Sun 3/8

6:30 pm-7:24 pm

Nonstop1h 54m

$254

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Wed 1/7

8:05 am-10:55 am

Nonstop1h 50m

Sioux City Sioux Gateway

Sun 1/11

6:00 am-6:57 am

Nonstop1h 57m

$310

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Thu 1/8

9:00 pm-11:47 pm

Nonstop1h 47m

Sioux City Sioux Gateway

Mon 1/12

6:00 am-6:57 am

Nonstop1h 57m

$310

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Sat 1/3

3:35 pm-6:13 pm

Nonstop1h 38m

$203

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Sun 12/28

3:35 pm-6:13 pm

Nonstop1h 38m

$253

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Mon 12/29

3:35 pm-6:13 pm

Nonstop1h 38m

$253

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

Compare providers for flights from Denver 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 Denver to Sioux City in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 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 Denver-Sioux City flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Denver-Sioux City flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Denver-Sioux City flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Denver-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 Denver-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 Denver to Sioux City

Have a flexible travel schedule? Discover the best time to fly to Sioux City from Denver 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 Denver to Sioux City

What is the cheapest month to book a flight from Denver to Sioux City?

Currently, March is the cheapest month in which you can book a flight from Denver to Sioux City (average of $39). Flying from Denver to Sioux City in December is currently the most expensive (average of $92). 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.

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

Find hourly flight availability from Denver to Sioux City. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 26, 2025.

It’s optimal to fly from Denver to Sioux City at noon. By choosing this option you can save up to 24% on the cost of your flight, compared to a flight in the morning.

Reviews of airlines servicing Sioux City

Get insights into the airlines that provide service to Sioux City. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sioux City. Reviews last updated December 26, 2025.
Read reviews from past customers who have flown United Airlines from Denver to Sioux City. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,115 reviews

Crew

8.1

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,115 reviews
United Airlines
7.4
Good
9,115 reviews

Crew

8.1

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Related info for your journey

Find useful and relevant information for your journey from Denver 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 airports do I use to fly from Denver to Sioux City?

    If you wish to fly to Sioux City from Denver, then you need to book flights from Denver Intl to Sioux City Sioux Gateway. There is 1 flight from Denver Intl (DEN) to Sioux Gateway (SUX) per day to choose from. Flights to Sioux City from Denver Intl are available from 1 airline, which means you should have some options if you want to compare airfare deals. 1h 38m is how long a nonstop flight from Denver to Sioux City Sioux Gateway typically takes.

  • How long is the flight from Denver to Sioux City?

    United Airlines can get you from Denver to Sioux City in just under 1h 40m. Your travel time will be generally consistent. There are 465 mi between Denver and Sioux City. Generally, flights for this route are nonstop.

  • What is the cheapest airline to fly from Denver to Sioux City round-trip?

    United Airlines, at $214, was found to be the cheapest airline from Denver to Sioux City.. Users have found that United Airlines is 40% cheaper than the other options available to this destination.

  • What are the cheapest flights from Denver to Sioux City?

    Looking at all options, your cheapest flight can be booked for $153. While the most popular route (Denver Intl - Sioux City Sioux Gateway) can be booked for $214 on average, our data indicates $173 when flying from Denver to Sioux City.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Denver 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 Denver to Sioux City?

    Currently, March is the cheapest month in which you can book a flight from Denver to Sioux City (average of $39). Flying from Denver to Sioux City in December is currently the most expensive (average of $92). 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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Top airline flying from Denver to Sioux City

Discover the top airline that operate flights from Denver to Sioux City. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$214Average$348FlexibilityNo cancel feeOn-time69%

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