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Sioux City

$153+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SUX
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap 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 August 14, 2025.

Round-trip from

$214
(United Airlines)

One-way from

$153
(United Airlines)

Popular in

April

Cheapest in

December

Average price

$392
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. 18% potential increase in price ($73 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find 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 August 14, 2025.

This United Airlines deal was found by Cheapflights users on 8/13. 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.
Wed 9/103:40 pmDEN - SUX
Nonstop1h 33mUnited Airlines
Wed 9/176:48 pmSUX - DEN
Nonstop1h 47mUnited Airlines
Deal found 8/13$214
This United Airlines deal was found by Cheapflights users on 8/12. 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 10/103:40 pmDEN - SUX
Nonstop1h 34mUnited Airlines
Mon 10/136:51 pmSUX - DEN
Nonstop1h 49mUnited Airlines
Deal found 8/12$254
This United Airlines deal was found by Cheapflights users on 8/13. 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 10/93:40 pmDEN - SUX
Nonstop1h 34mUnited Airlines
Sun 10/126:51 pmSUX - DEN
Nonstop1h 49mUnited Airlines
Deal found 8/13$302
This United Airlines deal was found by Cheapflights users on 8/12. 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.
Wed 8/273:40 pmDEN - SUX
Nonstop1h 33mUnited Airlines
Sun 8/316:48 pmSUX - DEN
Nonstop1h 47mUnited Airlines
Deal found 8/12$310
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Wed 9/243:40 pmDEN - SUX
Nonstop1h 33mUnited Airlines
Mon 9/296:51 pmSUX - DEN
Nonstop1h 49mUnited Airlines
Deal found 8/13$312
This United Airlines deal was found by Cheapflights users on 8/14. 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 11/203:35 pmDEN - SUX
Nonstop1h 33mUnited Airlines
Sun 11/237:45 amSUX - DEN
1 stop26h 14mUnited Airlines
Deal found 8/14$357
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Mon 10/133:40 pmDEN - SUX
Nonstop1h 34mUnited Airlines
Sun 10/266:46 pmSUX - DEN
Nonstop1h 48mUnited Airlines
Deal found 8/13$362
This United Airlines deal was found by Cheapflights users on 8/13. 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 10/147:45 amDEN - SUX
2 stops14h 15mUnited Airlines
Mon 10/276:46 pmSUX - DEN
Nonstop1h 48mUnited Airlines
Deal found 8/13$368
This United Airlines deal was found by Cheapflights users on 8/11. 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 8/223:40 pmDEN - SUX
Nonstop1h 33mUnited Airlines
Sat 8/236:48 pmSUX - DEN
Nonstop1h 47mUnited Airlines
Deal found 8/11$410

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 August 14, 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

Wed 9/10

3:40 pm-6:13 pm

Nonstop1h 33m

Sioux City Sioux Gateway

Wed 9/17

6:48 pm-7:35 pm

Nonstop1h 47m

$214

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Tue 10/14

3:40 pm-6:14 pm

Nonstop1h 34m

Sioux City Sioux Gateway

Mon 10/27

6:46 pm-7:34 pm

Nonstop1h 48m

$254

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Fri 11/21

3:35 pm-6:08 pm

Nonstop1h 33m

Sioux City Sioux Gateway

Sun 11/23

6:46 pm-7:34 pm

Nonstop1h 48m

$254

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Fri 10/10

3:40 pm-6:14 pm

Nonstop1h 34m

Sioux City Sioux Gateway

Mon 10/13

6:51 pm-7:40 pm

Nonstop1h 49m

$254

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Thu 11/20

3:35 pm-6:08 pm

Nonstop1h 33m

Sioux City Sioux Gateway

Sun 11/23

6:46 pm-7:34 pm

Nonstop1h 48m

$254

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Thu 10/9

3:40 pm-6:14 pm

Nonstop1h 34m

Sioux City Sioux Gateway

Sun 10/12

6:51 pm-7:40 pm

Nonstop1h 49m

$302

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Wed 9/24

3:40 pm-6:13 pm

Nonstop1h 33m

Sioux City Sioux Gateway

Mon 9/29

6:51 pm-7:40 pm

Nonstop1h 49m

$302

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Thu 8/28

3:40 pm-6:13 pm

Nonstop1h 33m

Sioux City Sioux Gateway

Mon 9/1

6:48 pm-7:35 pm

Nonstop1h 47m

$310

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Wed 1/7

3:25 pm-5:59 pm

Nonstop1h 34m

$153

DenverSioux City

DEN - SUX

DENSUX

Denver Intl

Sat 9/20

3:40 pm-6:13 pm

Nonstop1h 33m

$173

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 12 results
1
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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, October is the cheapest month in which you can book a flight from Denver to Sioux City (average of $318). Flying from Denver to Sioux City in March is currently the most expensive (average of $446). 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 August 14, 2025.

It’s optimal to fly from Denver to Sioux City in the morning. By choosing this option you can save up to 16% on the cost of your flight, compared to a flight in the afternoon.

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 August 14, 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
8,916 reviews

Crew

8.1

Boarding

7.7

Food

6.6

Comfort

7.3

Entertainment

7.1

Overall

7.4

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
8,916 reviews
United Airlines
7.4
Good
8,916 reviews

Crew

8.1

Boarding

7.7

Food

6.6

Comfort

7.3

Entertainment

7.1

Overall

7.4

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

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 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 36% cheaper than the other options available to this destination.

  • 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, October is the cheapest month in which you can book a flight from Denver to Sioux City (average of $318). Flying from Denver to Sioux City in March is currently the most expensive (average of $446). 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 Sioux City?

Book flights to Sioux City if you plan to visit one of these locations
Norfolk

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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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$214Average$300FlexibilityNo cancel feeOn-time69%

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