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$178+ 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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — DEN
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$214
(United Airlines)

One-way from

$178
(United Airlines)

Popular in

May

Cheapest in

March

Average price

$340

Good round-trip deal

$323 or less

Good one-way deal

$257 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. 14% potential increase in price ($48 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 29, 2025.

This United Airlines deal was found by Cheapflights users on 7/28. 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 10/96:51 pmSUX - DEN
Nonstop1h 49mUnited Airlines
Mon 10/133:40 pmDEN - SUX
Nonstop1h 34mUnited Airlines
Deal found 7/28$214

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 July 29, 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 10/9

6:51 pm-7:40 pm

Nonstop1h 49m

Denver Intl

Mon 10/13

3:40 pm-6:14 pm

Nonstop1h 34m

$214

Sioux CityDenver

SUX - DEN

SUXDEN

Sioux City Sioux Gateway

Tue 8/26

6:48 pm-7:35 pm

Nonstop1h 47m

$178

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

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 July 29, 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 40% 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 July 29, 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
8,899 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

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
8,899 reviews
United Airlines
7.4
Good
8,899 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

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 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 6 times in the past calendar month.

  • 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 $214. Users have found that United Airlines is 23% 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 $702, 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, 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
Winter Park
Lakewood
Greeley
Cripple Creek
Brighton
Silverthorne
Golden
Thornton
Frisco
Grand Lake
Manitou Springs
Central City
Fort Morgan
Glendale
Copper Mountain
Wheat Ridge
Longmont
Broomfield

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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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$194Average$276FlexibilityNo cancel feeOn-time69%

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