SUX - DEN

$158 Find Cheap Flights from Sioux City to Denver

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sioux City to Denver departing on 11/18. 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

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
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Flights 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

Thu, Jul 10 - Mon, Jul 14
United Airlines Logo
6:53 pm - 7:36 pmSUX-DEN
1h 43mnonstop
United Airlines Logo
3:40 pm - 6:18 pmDEN-SUX
1h 38mnonstop
$214United Airlines
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Wed, Jul 30 - Sun, Aug 3
United Airlines Logo
6:53 pm - 7:36 pmSUX-DEN
1h 43mnonstop
United Airlines Logo
3:40 pm - 6:18 pmDEN-SUX
1h 38mnonstop
$254United Airlines
Find Deal
Tue, Nov 18 - Tue, Nov 25
United Airlines Logo
6:50 pm - 7:34 pmSUX-DEN
1h 44mnonstop
United Airlines Logo
3:25 pm - 5:59 pmDEN-SUX
1h 34mnonstop
$262United Airlines
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Tue, Sep 16 - Tue, Sep 23
United Airlines Logo
6:48 pm - 7:35 pmSUX-DEN
1h 47mnonstop
United Airlines Logo
3:40 pm - 6:13 pmDEN-SUX
1h 33mnonstop
$302United Airlines
Find Deal
Tue, Jul 1 - Fri, Jul 4
United Airlines Logo
6:53 pm - 7:36 pmSUX-DEN
1h 43mnonstop
United Airlines Logo
3:40 pm - 6:18 pmDEN-SUX
1h 38mnonstop
$350United Airlines
Find Deal
Sun, Aug 3 - Thu, Aug 7
United Airlines Logo
6:53 pm - 7:36 pmSUX-DEN
1h 43mnonstop
United Airlines Logo
3:40 pm - 6:18 pmDEN-SUX
1h 38mnonstop
$360United Airlines
Find Deal
Tue, Sep 16 - Tue, Sep 23
United Airlines Logo
6:48 pm - 7:35 pmSUX-DEN
1h 47mnonstop
United Airlines Logo
6:00 pm - 10:57 pmDEN-SUX
27h 57m1 stop
$363United Airlines
Find Deal
Thu, Jul 10 - Tue, Jul 15
United Airlines Logo
6:53 pm - 7:36 pmSUX-DEN
1h 43mnonstop
United Airlines Logo
6:00 am - 10:40 pmDEN-SUX
15h 40m1 stop
$372United Airlines
Find Deal
Sat, Oct 4 - Sat, Oct 11
United Airlines Logo
7:50 am - 4:35 pmSUX-DEN
9h 45m1 stop
United Airlines Logo
3:40 pm - 6:14 pmDEN-SUX
1h 34mnonstop
$373United Airlines
Find Deal
Sat, Aug 16 - Fri, Aug 22
United Airlines Logo
6:53 pm - 7:36 pmSUX-DEN
1h 43mnonstop
United Airlines Logo
9:40 am - 10:57 pmDEN-SUX
12h 17m1 stop
$377United Airlines
Find Deal
Useful Info

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 Saturdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Denver, Friday is the cheapest day to fly and Monday 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 July, where the average cost of round-trip tickets is $435 and $340 respectively.

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Good to know

Low seasonJanuary
High seasonJuly
Cheapest flight$158
Best time to beat the crowds with an average 0% drop in price.
Most popular time to fly with an average 22% increase in price.
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 $158 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?

    Alaska 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 $244 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 8809 reviews
7.3Comfort
6.6Food
7.7Boarding
8.1Crew
7.0Entertainment
Airline reviews

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

4.0 OkayElora, May 2025BUR - DEN
Read more United Airlines reviews

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.

Food choices were very limited. Taste of the dishes was average.

I liked all the informational texts. I always knew where to go and when .

Received an email the night before showing that there would be seatback entertainment on our flight. We get on and there was no seatback entertainment. And then it was a scramble to try to set up the iPads for the kids before takeoff so they could watch something for the four hour flight.

The reason I don’t fly United. No in seat entertainment for a long flight and inconsistent WiFi and entertainment available from my device.

It was a good flight. Nothing comes to mind about how it could have been better. It was a newer plane, seemed like a great upgrade from your older ones. Staff was very good as well.

The food for long haul was poor compared to Singapore airlines economy. Pasta plain with tomato sauce . Singapore airlines give me Hagen dash small ice cream cup it was great. The choices of dinner course Singapore air also much better The crew mostly friendly. The economy seat are as expected.

The plane was clean. The staff was excellent. The flight attendants were very good. Enjoyable flight. Overall. The seats in the back are too small but, will always be.

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

Information on your arrival and departure airports

Sioux City (SUX)
Denver (DEN)

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