$158 Cheap Flights from Sioux City (SUX) to Denver (DEN)

View $158 flight on Sun, Sep 14, 2025Opens in a new window

Popular airlines from Sioux City, IA (SUX-Sioux Gateway) to Denver Intl. Airport (DEN)

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Cheap Flights from Sioux City to Denver (SUX-DEN)

Prices were available within the past 7 days and start at $158 for one-way flights and $214 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Oct 15 - Tue, Oct 21
SUX
Sioux City
DEN
Denver
$214 Roundtrip, found 8 hours ago
$214
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Oct 15 from Sioux City to Denver, returning Tue, Oct 21, priced at $214 found 8 hours ago
United
Sun, Oct 12 - Tue, Oct 28
SUX
Sioux City
DEN
Denver
$254 Roundtrip, found 1 hour ago
$254
Roundtrip
found 1 hour ago
Select United flight, departing Sun, Oct 12 from Sioux City to Denver, returning Tue, Oct 28, priced at $254 found 1 hour ago
United
Fri, Dec 26 - Tue, Dec 30
SUX
Sioux City
DEN
Denver
$262 Roundtrip, found 3 hours ago
$262
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Dec 26 from Sioux City to Denver, returning Tue, Dec 30, priced at $262 found 3 hours ago
United
Fri, Sep 19 - Wed, Sep 24
SUX
Sioux City
DEN
Denver
$266 Roundtrip, found 1 day ago
$266
Roundtrip
found 1 day ago
Select United flight, departing Fri, Sep 19 from Sioux City to Denver, returning Wed, Sep 24, priced at $266 found 1 day ago
United
Fri, Dec 26 - Tue, Dec 30
SUX
Sioux City
DEN
Denver
$302 Roundtrip, found 3 hours ago
$302
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Dec 26 from Sioux City to Denver, returning Tue, Dec 30, priced at $302 found 3 hours ago
United
Sun, Nov 2 - Wed, Nov 5
SUX
Sioux City
DEN
Denver
$310 Roundtrip, just found
$310
Roundtrip
just found
Select United flight, departing Sun, Nov 2 from Sioux City to Denver, returning Wed, Nov 5, priced at $310 just found
United
Thu, Sep 4 - Sat, Sep 13
SUX
Sioux City
DEN
Denver
$312 Roundtrip, found 9 hours ago
$312
Roundtrip
found 9 hours ago
Select United flight, departing Thu, Sep 4 from Sioux City to Denver, returning Sat, Sep 13, priced at $312 found 9 hours ago
United
Thu, Mar 5 - Mon, Mar 9
SUX
Sioux City
DEN
Denver
$314 Roundtrip, found 1 day ago
$314
Roundtrip
found 1 day ago
Select United flight, departing Thu, Mar 5 from Sioux City to Denver, returning Mon, Mar 9, priced at $314 found 1 day ago
United
Fri, Oct 3 - Tue, Oct 7
SUX
Sioux City
DEN
Denver
$328 Roundtrip, found 21 hours ago
$328
Roundtrip
found 21 hours ago
Select United flight, departing Fri, Oct 3 from Sioux City to Denver, returning Tue, Oct 7, priced at $328 found 21 hours ago
United
Thu, Dec 25 - Sun, Dec 28
SUX
Sioux City
DEN
Denver
$332 Roundtrip, found 3 days ago
$332
Roundtrip
found 3 days ago
Select United flight, departing Thu, Dec 25 from Sioux City to Denver, returning Sun, Dec 28, priced at $332 found 3 days ago

Find the cheapest month to fly from Sioux City (SUX) to Denver (DEN)

January is typically the cheapest month to fly

From $194 - $405 per traveler.

Graph displaying average flight prices per month

Alternative airports near Denver

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Denver Intl. DEN. Cheapest option available. Average driving time to city center is 32 minutes. Flights from $262
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $262
Flights from Sioux City (SUX) to Denver (DEN)
Origin airport
Sioux Gateway
Destination airport
Denver Intl.
Airlines serving
United
Roundtrip price
$214
Distance
466 mi
Average flight time
1 hour 47 mins

Sioux City to Denver Flights

The cheapest times to fly from Sioux City to Denver

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Sioux City to Denver are during the month of October. You can find some of the cheapest flights from Sioux City to Denver with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Sioux City to Denver

Sunday is one of the best days to book for cheap flights from Sioux City to Denver: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Sioux City to Denver

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Sioux City to Denver in 2025. You can also book with separate airlines for your outbound and return journeys, from $158 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Sioux City to Denver flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Sioux City to Denver airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN) cost?
Lock in a cheap one-way flight from $158 or cheap return flight from $214 from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN)?
The cheapest month to fly from SUX to DEN is October, when there's less demand. Off-peak season is usually when better flight deals are available between these airports.
Which airlines fly direct from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN)?
When jetting out of Sioux Gateway Airport (SUX), you can catch a nonstop flight to Denver Intl. Airport (DEN) with United Airlines.
What is the cheapest airline that flies from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN)?
To find the cheapest airline flying from SUX to DEN, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN)?
On average, there is just 1 nonstop flight departing from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN) per day. If this doesn't fit your plans, check out flights with layovers. Just customize your search results on Expedia to include one stop or more to discover a better alternative.
What are the most popular departure times for flights from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN)?
Flights between SUX and DEN tend to be busiest at 5 PM. For a more relaxed trip and potentially cheaper prices, look for a departure that's outside typical rush times.
What day of the week has the most flights from SUX to DEN?
Friday offers the most flights from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN). Consider leaving on this day and you'll have the best chance of finding a departure that fits your itinerary.
What is the earliest flight from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN)?
The first flight of the day leaving Sioux Gateway Airport (SUX) is at around 5:15PM UTC-6. Catch this flight and you'll reach Denver Intl. Airport (DEN) at approximately 6:05PM UTC-7. The total travel time is 1h 50m.
How long does it take to fly from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN)?
Flights from SUX to DEN have an average travel time of 1 hour and 50 minutes. The distance between the two airports is 470 mi.
What airline has the least delays from SUX to DEN?
United Airlines has the best performance for on-time direct flights from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN), with an on-time score of 87%. Use the Expedia App to see your flight status before you go and get real-time alerts about any trip changes.
What is the best time to fly from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN)?
To arrive at Denver Intl. Airport (DEN) without delays, choose a flight that leaves Sioux Gateway Airport (SUX) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Denver from Sioux Gateway Airport (SUX)?
If you're taking a direct flight from Sioux Gateway Airport (SUX) to Denver, Denver Intl. Airport (DEN) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN) last-minute?
Holding off until just before your trip to book your flight from SUX to DEN often results in higher prices. While you may come across some last-minute offers, they're not always guaranteed. Allow some flexibility in your schedule to boost your chances of snagging a bargain.
Is it cheaper to book a SUX to DEN flight and hotel package?
Opting for a SUX to DEN flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Pick from our wide range of stays and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Sioux Gateway Airport (SUX) to Denver Intl. Airport (DEN)?
It's generally possible to cancel or reschedule your SUX to DEN flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.