SUX - DEN

$214 Find Cheap Flights from Sioux City to Denver

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sioux City to Denver departing on 8/21. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Denver

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sioux City to Denver, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sioux City to Denver, as well as popular online travel agencies
Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$214
Overall average: $308
United Airlines
ven 8/21mer 9/2
SUX - DEN • Non-stop
Cheapest one-way
$218
United Airlines
dom 3/22
SUX - DEN • Non-stop
Nonstop flights
You can fly direct with United Airlines. Average duration is 1h 53m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
When to travel
Cheapest • 27% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Denver!
Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Sioux City to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Sioux City to Denver

ven, ago 21 - mer, set 2
United Airlines Logo
11:32 am - 12:26 pm
SUX
-
DEN
1h 54mnonstop
United Airlines Logo
8:15 am - 10:55 am
DEN
-
SUX
1h 40mnonstop
$214United Airlines
mer, apr 8 - dom, mag 3
United Airlines Logo
6:00 am - 6:53 am
SUX
-
DEN
1h 53mnonstop
United Airlines Logo
8:00 am - 10:41 am
DEN
-
SUX
1h 41mnonstop
$234United Airlines
ven, ago 21 - mar, ago 25
United Airlines Logo
11:32 am - 12:26 pm
SUX
-
DEN
1h 54mnonstop
United Airlines Logo
8:15 am - 10:55 am
DEN
-
SUX
1h 40mnonstop
$254United Airlines
gio, apr 2 - dom, apr 5
United Airlines Logo
6:00 am - 6:53 am
SUX
-
DEN
1h 53mnonstop
United Airlines Logo
8:05 am - 10:46 am
DEN
-
SUX
1h 41mnonstop
$262United Airlines
ven, giu 26 - dom, lug 5
United Airlines Logo
6:30 pm - 7:24 pm
SUX
-
DEN
1h 54mnonstop
United Airlines Logo
8:15 am - 10:57 am
DEN
-
SUX
1h 42mnonstop
$282United Airlines
sab, ago 1 - lun, ago 31
United Airlines Logo
11:32 am - 12:26 pm
SUX
-
DEN
1h 54mnonstop
United Airlines Logo
9:08 pm - 11:46 pm
DEN
-
SUX
1h 38mnonstop
$285United Airlines
ven, mar 27 - lun, mar 30
United Airlines Logo
6:10 am - 7:04 am
SUX
-
DEN
1h 54mnonstop
United Airlines Logo
8:05 am - 10:46 am
DEN
-
SUX
1h 41mnonstop
$310United Airlines
mar, ago 25 - sab, ago 29
United Airlines Logo
11:32 am - 12:26 pm
SUX
-
DEN
1h 54mnonstop
United Airlines Logo
9:08 pm - 11:46 pm
DEN
-
SUX
1h 38mnonstop
$350United Airlines
gio, lug 2 - lun, lug 6
United Airlines Logo
6:30 pm - 7:24 pm
SUX
-
DEN
1h 54mnonstop
United Airlines Logo
8:15 am - 10:57 am
DEN
-
SUX
1h 42mnonstop
$360United Airlines
ven, apr 3 - lun, apr 6
United Airlines Logo
6:32 pm - 7:25 pm
SUX
-
DEN
1h 53mnonstop
United Airlines Logo
8:05 am - 10:46 am
DEN
-
SUX
1h 41mnonstop
$362United Airlines
Booking Insights

KAYAK's insights & trends for Sioux City to Denver flights

Get data-powered insights and trends into flights from Sioux City to Denver to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Sioux City to Denver?

The average price of all round-trip flights from Sioux City to Denver clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Sioux City to Denver, look for departures on Wednesdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Denver, Saturday is the cheapest day to fly and Tuesday is the most expensive.

What is the cheapest month to fly from Sioux City to Denver?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Sioux City to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Sioux City to Denver is March, where tickets cost $214 (return) on average. On the other hand, the most expensive months are May and February, where the average cost of round-trip tickets is $395 and $360 respectively.

Good to know

Low seasonNovember
Cheapest flight$214
Best time to beat the crowds with an average 27% drop in price.
Most popular time to fly and prices are also 14% lower on average.
Flight from Sioux City to Denver

When to book flights from Sioux City to Denver

Are your dates flexible? Find out the best times to travel from Sioux City to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Sioux City to Denver

  • What is the cheapest flight from Sioux City to Denver?

    In the last 3 days, the lowest price for a flight from Sioux City to Denver was $218 for a one-way ticket and $214 for a round-trip.

  • Do I need a passport to fly between Sioux City and Denver?

    No, a passport isn't needed to fly from Sioux City to Denver. However, local authorities might ask for an official ID.

  • Which airlines offer Wi-Fi service onboard planes from Sioux City to Denver?

    American Airlines, and Delta offer inflight Wi-Fi service on the Sioux City to Denver flight route.

  • Which aircraft models fly most regularly from Sioux City to Denver?

    The Canadair (Bombardier) Regional Jet is the aircraft model that flies most regularly on the Sioux City to Denver flight route.

  • Which airline alliances offer flights from Sioux City to Denver?

    Star Alliance is the only airline alliance operating flights between Sioux City and Denver.

  • On which days can I fly direct from Sioux City to Denver?

    There are nonstop flights from Sioux City to Denver on a daily basis.

  • How does KAYAK find such low prices on flights from Sioux City to Denver?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Sioux City to Denver.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Sioux City to Denver?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Sioux City is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Sioux City to Denver?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to Sioux City with another airline. Booking your flights between Sioux City and DEN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Sioux City to Denver?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from Sioux City up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Sioux City to Denver

  • Looking for a cheap flight? 25% of our users found flights on this route for $242 or less one-way and $338 or less round-trip.

Prefer to fly direct from Sioux City to Denver?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Sioux City Sioux Gateway to Denver Intl.
Find which airlines fly direct from Sioux City Sioux Gateway Airport to Denver Intl Airport, which days they fly and book direct flights.

Direct departures

Sioux City Sioux Gateway to Denver Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

Denver Intl to Sioux City Sioux Gateway

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Reviews of the top airline flying from Sioux City to Denver

 
See real verified KAYAK customer reviews for airlines flying from Sioux City to Denver. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Sioux City to Denver? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9428 reviews
7.7Boarding
7.3Comfort
7.1Entertainment
8.1Crew
6.6Food
Airline reviews

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

6.0 GoodAnonymous, Mar 2026
SFO - DEN
Read more United Airlines reviews

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

It’s always a great time flying with united airlines.

We got delayed three hours and nobody thought to have the bathroom fixed while we were sitting waiting to board? took a full hour to have maintenance come and check it off. Had to shut the bathroom down twice so that the pilots could go to the bathroom. Everyone missed their connections.

Women boarding passengers at the gate was absolutely rude and disrespectful of passengers. The flight attendant was absolutely delightful! Smiling and connected with the passengers. So happy. The seats are cramped and uncomfortable but I guess that’s just the way it is Communication regarding flight was excellent

As great a red-eye flight as red-eye flights can be.

Both of my flights arrived early and check in process was smooth

Everything was on time Will use united again for sure

The flight was delayed by two de-icings. The seatbelt did not work correctly. It did not stay tight.

Hotter than Hades in August. Why, why do crews think that in the winter when we are already dressed for cold weather we need a cabin that is 82 degrees. Even the vents were blowing hot air.

Flight was delayed. De-icing took a while. When we landed had to wait for another plane to vacate our gate. Just an overall bad experience.

Everything you need to know for your flight from Sioux City to Denver

Information on your arrival and departure airports