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$158+ Cheap flights from Sioux City to Denver (SUX - DEN)

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 1/4. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — DEN
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap flight deals from Sioux City to Denver

Cheapest flights from Sioux City to Denver
Explore the most affordable flight options available from Sioux City to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This United Airlines deal was found by Cheapflights users on 12/13. 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 12/3111:48 amSUX - DEN
Nonstop1h 57mUnited Airlines
Fri 1/23:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 12/13$310
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Mon 12/226:54 pmSUX - DEN
Nonstop1h 57mUnited Airlines
Mon 1/53:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 12/14$312
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Tue 12/236:54 pmSUX - DEN
Nonstop1h 57mUnited Airlines
Sun 12/283:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 12/14$360
This United Airlines deal was found by Cheapflights users on 12/13. 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.
Fri 12/266:54 pmSUX - DEN
Nonstop1h 57mUnited Airlines
Fri 1/23:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 12/13$410
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Fri 12/196:54 pmSUX - DEN
Nonstop1h 57mUnited Airlines
Tue 12/233:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 12/14$460
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Wed 12/176:52 pmSUX - DEN
Nonstop1h 48mUnited Airlines
Fri 12/193:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 12/14$510
This United Airlines deal was found by Cheapflights users on 12/13. 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.
Sat 12/276:54 pmSUX - DEN
Nonstop1h 57mUnited Airlines
Fri 1/23:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 12/13$610

Find flight deals from Sioux City to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Sioux City (SUX) to Denver (DEN). 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 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$214
(United Airlines)

One-way from

$158
(United Airlines)

Popular in

May

Cheapest in

March

Average price

$360

Good round-trip deal

$277 or less

Good one-way deal

$208 or less
Provider with most accurate pricing for Sioux City Sioux Gateway-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sioux City Sioux Gateway-Denver Intl flights.
Search Deals
From Sioux City Sioux Gateway to Denver Intl
Search Deals
One-way flight from Sioux City Sioux Gateway to Denver Intl
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Sioux City Sioux Gateway to Denver Intl.
Search Deals
Price to beat on a one-way flight from Sioux City Sioux Gateway to Denver Intl.
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Sioux City to Denver 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 15, 2025.
Use the filters below to find and compare flights from Sioux City to Denver that are best for you.

Fly from

Sioux City

Fly to

Denver

Route

Depart

Return

Price

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Wed 1/14

6:43 pm-7:40 pm

Nonstop1h 57m

Denver Intl

Wed 1/21

9:00 pm-11:47 pm

Nonstop1h 47m

$214

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Fri 2/13

6:46 pm-7:40 pm

Nonstop1h 54m

Denver Intl

Sun 2/15

8:05 am-10:45 am

Nonstop1h 40m

$214

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Fri 4/10

6:30 pm-7:27 pm

Nonstop1h 57m

Denver Intl

Sun 4/19

8:05 am-10:39 am

Nonstop1h 34m

$214

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Wed 1/14

6:43 pm-7:40 pm

Nonstop1h 57m

Denver Intl

Sun 1/18

8:05 am-10:55 am

Nonstop1h 50m

$214

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Wed 12/31

11:48 am-12:45 pm

Nonstop1h 57m

Denver Intl

Fri 1/2

3:35 pm-6:13 pm

Nonstop1h 38m

$310

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Mon 12/29

6:54 pm-7:51 pm

Nonstop1h 57m

Denver Intl

Fri 1/2

3:35 pm-6:13 pm

Nonstop1h 38m

$410

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Sun 1/4

6:54 pm-7:51 pm

Nonstop1h 57m

$158

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Sat 1/10

6:43 pm-7:40 pm

Nonstop1h 57m

$158

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Sat 1/3

6:54 pm-7:51 pm

Nonstop1h 57m

$158

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Fri 1/2

6:54 pm-7:51 pm

Nonstop1h 57m

$158

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 12 results
1
2

Compare providers for flights from Sioux City to Denver

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

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

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

Currently, February is the cheapest month in which you can book a flight from Sioux City to Denver (average of $37). Flying from Sioux City to Denver in June is currently the most expensive (average of $78). 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 SUX to DEN?

Find hourly flight availability from Sioux City to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 15, 2025.

One of the essential ways to save on airfare from Sioux City to Denver is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 71% on airfare.

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated December 15, 2025.
Read reviews from past customers who have flown United Airlines from Sioux City to Denver. 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
9,092 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
United Airlines
7.4
Good
9,092 reviews
United Airlines
7.4
Good
9,092 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

Related info for your journey

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

  • How popular is this Sioux City to Denver flight route?

    Flights from Sioux City Sioux Gateway to Denver Intl have been viewed 8 times in the past calendar month.

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

    Airlines like United Airlines fly from Sioux City to Denver in about 1h 57m. The time it takes to get you to your destination is usually consistent. The distance from Sioux City to Denver is about 465 mi. Most flights are nonstop.

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

    Cheapflights users have booked flights from Sioux City to Denver round-trip from $194. Users have found that United Airlines is 31% cheaper than the other options available to this destination.

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

    Looking for the cheapest flight from Sioux City to Denver? While on average our users pay $298, our data indicates the cheapest price to be $177. The most popular route (Sioux City Sioux Gateway - Denver Intl), is priced around $214.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Sioux City to Denver (average of $37). Flying from Sioux City to Denver in June is currently the most expensive (average of $78). 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 Denver?

Book flights to Denver if you plan to visit one of these locations
Black Hawk
Thornton
Broomfield
Westminster
Winter Park
Golden
Greeley
Lone Tree
Lakewood
Cripple Creek
Silverthorne
Central City
Frisco
Wheat Ridge
Manitou Springs
Fort Morgan
Brighton
Longmont
Idaho Springs
Evergreen

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Top airline flying from Sioux City to Denver

Discover the top airline that operate flights from Sioux City to Denver. 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$194Average$260FlexibilityNo cancel feeOn-time69%

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