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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 9/28. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — DEN
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap 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 September 11, 2025.

Round-trip from

$254
(United Airlines)

One-way from

$158
(United Airlines)

Popular in

May

Cheapest in

March

Average price

$258

Good round-trip deal

$303 or less

Good one-way deal

$329 or less
From Sioux City Sioux Gateway to Denver Intl
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One-way flight from Sioux City Sioux Gateway to Denver Intl
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Highest demand for flights based on searches. 12% potential increase in price ($39 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Sioux City Sioux Gateway to Denver Intl.
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Price to beat on a one-way flight from Sioux City Sioux Gateway to Denver Intl.
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Find 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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/10. 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 12/246:54 pmSUX - DEN
Nonstop1h 57mUnited Airlines
Fri 12/263:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 9/10$254
This United Airlines deal was found by Cheapflights users on 9/9. 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 9/9$262
This United Airlines deal was found by Cheapflights users on 9/10. 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
Tue 12/303:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 9/10$302
This United Airlines deal was found by Cheapflights users on 9/9. 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 9/256:51 pmSUX - DEN
Nonstop1h 49mUnited Airlines
Sun 9/283:40 pmDEN - SUX
Nonstop1h 34mUnited Airlines
Deal found 9/9$310
This United Airlines deal was found by Cheapflights users on 9/9. 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 12/256:54 pmSUX - DEN
Nonstop1h 57mUnited Airlines
Mon 12/293:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 9/9$312
This United Airlines deal was found by Cheapflights users on 9/10. 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
Sat 12/273:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 9/10$350
This United Airlines deal was found by Cheapflights users on 9/9. 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 9/166:48 pmSUX - DEN
Nonstop1h 47mUnited Airlines
Tue 9/233:40 pmDEN - SUX
Nonstop1h 33mUnited Airlines
Deal found 9/9$360
This United Airlines deal was found by Cheapflights users on 9/9. 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 12/217:50 amSUX - DEN
1 stop16h 48mUnited Airlines
Mon 12/293:35 pmDEN - SUX
Nonstop1h 38mUnited Airlines
Deal found 9/9$361
This United Airlines deal was found by Cheapflights users on 9/10. 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 12/246:54 pmSUX - DEN
Nonstop1h 57mUnited Airlines
Tue 12/309:35 amDEN - SUX
2 stops12h 40mUnited Airlines
Deal found 9/10$367

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 September 11, 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

Thu 11/6

6:46 pm-7:34 pm

Nonstop1h 48m

Denver Intl

Mon 11/10

3:35 pm-6:08 pm

Nonstop1h 33m

$254

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Sat 10/4

6:51 pm-7:40 pm

Nonstop1h 49m

Denver Intl

Sat 10/11

3:40 pm-6:14 pm

Nonstop1h 34m

$254

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Wed 10/8

6:51 pm-7:40 pm

Nonstop1h 49m

Denver Intl

Wed 10/15

3:40 pm-6:14 pm

Nonstop1h 34m

$262

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Fri 11/14

6:46 pm-7:34 pm

Nonstop1h 48m

Denver Intl

Mon 11/17

3:35 pm-6:08 pm

Nonstop1h 33m

$302

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Thu 9/25

6:51 pm-7:40 pm

Nonstop1h 49m

Denver Intl

Sun 9/28

3:40 pm-6:14 pm

Nonstop1h 34m

$310

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Fri 10/17

6:51 pm-7:40 pm

Nonstop1h 49m

Denver Intl

Sun 10/19

3:40 pm-6:14 pm

Nonstop1h 34m

$312

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Sun 9/21

6:48 pm-7:35 pm

Nonstop1h 47m

Denver Intl

Tue 9/23

3:40 pm-6:13 pm

Nonstop1h 33m

$360

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Tue 9/16

6:48 pm-7:35 pm

Nonstop1h 47m

Denver Intl

Tue 9/23

3:40 pm-6:13 pm

Nonstop1h 33m

$360

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Sun 9/28

6:51 pm-7:40 pm

Nonstop1h 49m

Denver Intl

Thu 10/2

3:40 pm-6:14 pm

Nonstop1h 34m

$360

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Thu 9/18

6:48 pm-7:35 pm

Nonstop1h 47m

Denver Intl

Tue 9/23

3:40 pm-6:13 pm

Nonstop1h 33m

$360

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/8

Showing 1-10 of 11 results
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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, October is the cheapest month in which you can book a flight from Sioux City to Denver (average of $197). Flying from Sioux City to Denver in March is currently the most expensive (average of $278). 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 September 11, 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 in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 72% 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 September 11, 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
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

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
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

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 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.

  • What airports do I use to fly from Sioux City to Denver?

    Booking a flight from Sioux City Sioux Gateway (SUX) to Denver Intl (DEN) is your only option if you wish to fly from Sioux City to Denver. On a typical day, there is 1 flight from Sioux Gateway to Denver Intl, all of which are around 1h 47m for a nonstop flight. You can also purchase a plane ticket from 1 airline when you book a flight from Sioux Gateway to Denver.

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

    Flights from Sioux City Sioux Gateway to Denver Intl have been viewed 6 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 48m. 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 32% 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 $679, our data indicates the cheapest price to be $214. The most popular route (Sioux City Sioux Gateway - Denver Intl), is priced around $254.

  • 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, October is the cheapest month in which you can book a flight from Sioux City to Denver (average of $197). Flying from Sioux City to Denver in March is currently the most expensive (average of $278). 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
Westminster
Black Hawk
Golden
Winter Park
Broomfield
Greeley
Lone Tree
Lakewood
Cripple Creek
Thornton
Silverthorne
Frisco
Manitou Springs
Fort Morgan
Glendale
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Sioux City to Denver

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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$194Average$261FlexibilityNo cancel feeOn-time69%

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